1. Angeboten von: Roberto
L Trouble Shooting 1
January 2001
CTV Chassis L01
Angeboten von: Roberto
Trouble Shooting

2. L01 Service Position Service Position
January 2001
Service position
The L01 chassis has an environmental independent service position, especially designed for service at customer’s home.
1. Disconnect the connecting cable feeding the right-hand speaker, also disconnect the degaussing cable.
2. The mono-carrier is removed by pushing the two centre clips (1) at both chassis brackets outwards and pulling the panel forward. (2)
3. Flip the mono-carrier over so that the component side of the board faces towards the CRT.
4. Slide the metal heat sink underneath the left chassis bracket (3) until the carrier is locked in position.
1. Disconnect RH-speaker and degaussing cable.
2. Push centre clips (1) outwards
3. Pull panel forward (2)
4. Flip the mono-carrier so that component side faces CRT.
5. Slide heat sink underneath the left chassis bracket (3)
until the carrier is locked in position.

3. L01 Repair facilities Measuring and test points in service printing
January 2001
Measuring and test points in service printing
Service printing on both sides of panel
Customer service mode - CSM
Service default mode - SDM
Service alignment mode - SAM
ComPair mode - Computer Aided Repair
Error indication on screen / flashing LED
Voltage reading and service test points are indicate in schematic diagram.
The PCB of the family board and modules are having service test points.
There are four service modes in this service software.

4. Test points L01 Service Test points
January 2001
A(n) - Audio circuit (BTSC/SAP,NDBX Stereo)
C(n) - Control circuit / front control
F(n) - Frame deflection circuit
I(n) - IF circuit
L(n) - Line deflection circuit
P(n) - Power supply
S(n) - Synchronization circuit
V(n) - Video processing circuit / CRT panel
Test points
The L01chassis is equipped with easily identifiable test points. These are clearly marked on the PCB. The test points refer to specific functional blocks, these are:
A1-A2-A3, etc.: Test points for the BTSC decoder / Audio amplifier
C1-C2-C3, etc.: Test points for the control circuit / front control
F1-F2-F3, etc.: Test points for the Frame (vertical deflection) circuit
I1-I2-I3, etc.: Test points for the IF (intermediate frequency) circuit
L1-L2-L3, etc.: Test points for the Line (horizontal) deflection circuit
P1-P2-P3, etc.: Test points for the power supply
S1-S2-S3, etc.: Test points for the synchronisation circuit
V1-V2-V3, etc.: Test points for the video processing circuitry / CRT panel
Measurements are performed under the following conditions: Video: colour bar signal; audio: 3kHz left, 1kHz righ

5. Service Mode L01 Service Mode The Service Mode consists of:-
January 2001
The Service Mode consists of:-
Customer Service Mode (CSM)
Service Default Mode (SDM)
Service Alignment Mode (SAM)
Computer Aided Repair Mode (Compair Mode)

6. L01 Customer Service Mode
January 2001
Entering CSM
MUTE (on RC) + any key At local keyboard for at least 4 secs.
With CSM
Picture and sound at last status setting *note: volume at default 25 %
Service unfriendly modes ignored
Exit CSM
Customer Service Mode (CSM)
Entering the Customer Service Mode.
The Customer Service Mode can be switched on by pressing simultaneously the button (MUTE) on the remote control and any key on the control buttons (VOL -, VOL +) on the TV for at least 4 seconds.
When the CSM is activated:
Picture settings is at last status and sound levels at 25 % setting
"Service unfriendly modes" are ignored
Exit the Customer Service Mode.
The Customer Service Mode will switch off after:
pressing any key on the remote control handset
switching off the TV set with the mains switch. All settings that were changed when CSM was activated are set back to the initial values
TV off with mains switch
Any key on RC

7. Benefits : Reduce non technical Fault
L Customer Service Mode
January 2001
1 L01BCD X.Y CSM
2 CODES XX XX XX XX XX
3 OP XXX XXX XXX XXX XXX XXX XXX
4 DETECTED SYSTEM DETECTED AUDIO
5 NOT TUNED SKIPPED
6 TIMER
7 VCHIP
8 CO XXX CL XXX BR XXX HU XXX SH XXX
9 VL XXX BL XXX AVL LIM XXX DV XXXXX
10 BS XXX TR XXX
The following information is displayed on screen:
1)Software version (L01BCD X.Y) and CSM indication.
2)Error buffer contents
3)Option code information
4)Video system (NTSC) and Sound system (STEREO) indication.
5) NOT TUNED : Displayed when no ident signal present SKIPPED : Displayed when current channel is "SKIPPED" or "NOT FAVORITE"
6) TIMER : Displayed when SLEEPTIMER or DAILY CLOCK is activated
7) VCHIP-ON : Displayed if any Vchip function is active AND if “Blocking disabled” is OFF 8)Configuration information
Last status: contrast (CO), colour (CL), brightness (BR), Last status: hue (HU), sharpness (SH)
9) Last status: volume level (VL), balance (BL) AVL" displayed when Automatic Volume Limiter is ON, delta volume (DV),
10) Last status: bass level (BS), treble (TR)
Exiting CSM
Any RC keys or local keyboard (switch to normal operation)
standby switched to standby, mains OFF switches set off,
Benefits : Reduce non technical Fault

8. L01 EXERCISE CSM 1. Put set in CSM
January 2001
1. Put set in CSM
2. Check “L01BCD X.Y” software cluster & version
3. Check “CODES” error status
4. Check “OP”options setting
Demo and hand on.
5. Check picture & sound setting status

9. L01 Service Default Mode Entering SDM
January 2001
Entering SDM
RC (remote control) MENU or
Jumper - short circuit 9631 / 9641
Exit SDM
RC (remote control) - STANDBY
Entering the SDM
Standard RC sequence followed by the key "MENU"
By connecting jumper 9631 and 9641 together (on the mono-carrier) while switching on the set. After switching on the set the link should be removed
Exiting the SDM
Switch the set to Standby (the error buffer is also cleared).
Note: When the mains power is switched off while the set is in SDM, the set will switch to SDM immediately when the mains is switched (wall outlet) on again. (The error buffer will be cleared).

10. L01 Service Default Mode SDM Short circuit 9631 & 9641 January 2001
when the internal method of SDM is used (connecting together 9631 and 9641).
Starts the LED flashing procedure
Inspecting the error buffer

11. L01 Service Default Mode L01US0 1.0 SDM Software version
January 2001
L01US0 1.0
SDM
Software version
S D M indication
ERR
Display explanation
Software identification of the micro controller (L01BCD X.Y); L01 is the chassis name; B is the region; C is the software diversity; D is the language: X = (main version number); Y = (subversion number)
"SDM" To indicate that the TV set is in de service mode;
"ERR" The last five detected errors; The left most number indicates the most recent error detected.
Contents of last 5 detected errors
SDM : Diagnostic Error, DC voltage and waveform Measurement

12. L01 Error Code history example
January 2001
The last five error code numbers are stored
No error
Error code 3
Means two errors in the buffer, the last error detected is 2,
the previous error is 3
Blinking LED
The contents of the error buffer can be made visible via “blinking LED", especially useful when there is no picture. Two methods of access:-
When entering SDM, the LED will repeatedly blink the number of times, equal to the last (newest) error code.

13. L01 Error Number January 2001 Error codes explanation
Error 0 = No error
Error 1 = X-ray (Only for USA sets)
Error 2 = High beam current protection and Horizontal protection
Error 3 = Vertical / Frame protection
Error 4 = Sound processor I2C error (MSP3415D)
Error 5 = Video start-up error (POR bit) and +8v protectuion
Error 6 = General I2C error
Error 7 =Power Down protection (Audio Amplifier)
Error 8 = E/W protection
Error 9 = I2C error EEPROM error, NV memory does not respond to the micro controller
Error 10 = I2C error PLL tuner
Error 11 =Black current loop instability protection Error 12 = I2C error PIP Processor
START
Error 2
Error 11
LED ON
LED OFF

14. 1. Put set in SDM with RC or S/C Jumper 2. Check Software version
L EXERCISE SDM
January 2001
1. Put set in SDM with RC or S/C Jumper
2. Check Software version
3. Read contents error buffer
Two way to enter SDM:
1)short “SDM” service pin and then switch the set ON (the SDM service pin uses one “interrupt” pin on the micro controller)
2)Remote control sequence “0-6” and before OSD time-out “2-5” and before OSD time-out “9-6” and before OSD time-out “MENU”
After entering in SDM check the software cluster and version
Two way to exit the SDM
1)Exit without clearing the error buffer
Mains OFF (when the set is switched on, the set will be in SDM again)
2)Exit with clearing the error buffer
RC “Standby” command (set switches to standby)

15. Local Keyboard - Volume Down & Channel Down
L Service Alignment Mode
January 2001
Entering SAM
RC STATUS or
Local Keyboard - Volume Down & Channel Down
while in “SDM” mode
Exit SAM
Service Alignment Mode (SAM)
Entering SAM:
Standard RC sequence followed by the key ”STATUS”
The SAM allows Options setting; adjusting the Demodulator I.F, white tone, picture geometry and sound.
Exiting the SAM
Switch the set to standby
Note: When the mains power is switched off while the set is in SAM, the set will switch to SAM immediately when the mains is switched on again. (The error buffer will not be cleared).
RC - STANDBY (error buffer cleared)

16. Contents of last 5 detected errors OB(n) - Option Byte Value
L Service Alignment Mode
January 2001
Operation hours timer
Software version
S A M indication
L011US SAM
ERR
XXX XXX XXX XXX XXX XXX XXX
Clear Clear?
Options
AKB
Tuner
White Tone
Geometry
Audio
Contents of last 5 detected errors
OB(n) - Option Byte Value
Clear Error Buffer
Display explanation
”99999" Operation hours timer;
“L01BCD X.Y” Software identification of the micro controller;
“SAM” To indicate that the TV set is in de service mode;
"ERR" The last five detected errors; The left most number indicates the most recent error detected.
“XXX" display the Value of the options bytes ( OB0 .. OB6);
“Clear” Clear all error buffer;
“Options” Setting options value ( OB0 .. OB6);
“AKB” Black current loop (on/off) disables black current loop
“Tuner” sub menu for tuner settings / adjustments
“White Tone” sub menu for white tone settings / adjustment
“Geometry” sub menu for geometry settings / adjustments
“Audio” sub menu for audio settings (Not for Nafta)
Menu items can be selected with the UP or DOWN key.
Entry into the selected items (sub menus) is done by the LEFT or RIGHT key. The selected item will be highlighted.
With the cursor LEFT/RIGHT keys, it is possible to increase/decease the value of the selected item.
By pressing the "CHANNEL DOWN" and "VOLUME DOWN" key on the local keyboard simultaneously when the set is in SDM

17. L01 SAM - Options sub menu January 2001 After entering in SAM.
Menu items can be selected with the UP or DOWN key.
Entry into the selected items (sub menus) is done by the LEFT or RIGHT key. The selected item will be highlighted.
With the cursor LEFT/RIGHT keys, it is possible to increase/decease the value of the selected item.
By pressing the "CHANNEL DOWN" and "VOLUME DOWN" key on the local keyboard simultaneously when the set is in SDM

18. L Options Structure
January 2001
Option Structure

19. L01 Options Bit Assignment
January 2001
Option Bit Assignment
Follows are the option bit assignment for all L01 software clusters.

20. L01 Options Bits Setting (example)
January 2001

21. L01 Nafta Large Screen Op Setting
January 2001
Nafta software cluster option setting (LS)
Up Dated
Note:
US0 = Service Naming
3US0 = Development Software Naming

22. Nafta software cluster option setting (SS)
L Nafta Small Screen Op Setting
January 2001
Nafta software cluster option setting (SS)
Up Dated

23. SAM - Tuner sub menu January 2001 Tuner sub menu
The tuner sub menu contains the following items:
– IF_PLL OFFSET: Default value =24 ; Do not align
– AFW: AFC Window
– AGC: AGC take-over point Default value =28
– YD (Luminance delay): Default value = 3 ; Do not align
– CL (Cathode drive level): Default value = 4 ; Do not align
– AFA
– AFB
The items AFA and AFB can not be selected, they are for monitoring purposes only.
Pressing UP or DOWN selects the next or previous item.
Pressing LEFT or RIGHT increases or decreases the value of the selected item. The changed values will be sent directly to the related hardware. The item values are stored in NVM if this sub menu is left.

24. SAM - White Tone sub menu
January 2001
White Tone
Normal
NORMAL RED
NORMAL GREEN
NORMAL BLUE
Cool
DELTA COOL RED
DELTA COOL GREEN
DELTA COOL BLUE
Warm
DELTA WARM RED
DELTA WARM GREEN
DELTA WARM BLUE
White tone sub menu
– NORMAL RED
– NORMAL GREEN
– NORMAL BLUE
– DELTA COOL RED
– DELTA COOL GREEN
– DELTA COOL BLUE
– DELTA WARM RED
– DELTA WARM GREEN
– DELTA WARM BLUE
OSD is kept to a minimum in this menu, in order to make white tone alignment possible.
Pressing UP or DOWN selects the next or previous item.
Pressing LEFT or RIGHT increases or decreases the value of the selected item. The changed values will be sent directly to the related hardware. The item values are stored in NVM if this sub menu is left.
No alignment is needed for white tone (use default values)

25. L01 SAM Geometry sub menu Geometry Horizontal Vertical
January 2001
Item Description
HP Horizontal Parallelogram
HB Horizontal Bow
HSH Horizontal Shift
EWW East-West Width
EWP East-West Parabola
UCP EW Upper Corner Parabola
LCP EW Lower Corner Parabola
EWT East-West Trapezium
Geometry
Horizontal
Item Description
VSL Vertical Slope
VAM Vertical Amplitude
VSC Vertical S-correction
VSH Vertical Shift
VX Vertical Zoom
SBL Service Blanking
Vertical
Geometry sub menu
The geometry sub menu contains the following items:
Horizontal
HP Horizontal Parallelogram
HB Horizontal Bow
HSH Horizontal Shift
EWW East-West Width
EWP East-West Parabola
UCP EW Upper Corner Parabola
LCP EW Lower Corner Parabola
EWT East-West Trapezium
Vertical
– VSL Vertical Slope
VAM Vertical Amplitude
VSC Vertical S-correction
VSH Vertical Shift
VX Vertical Zoom
SBL Service Blanking

26. No alignment is needed for AUDIO (use default values)
SAM - Audio sub menu
January 2001
Audio sub menu
The audio sub menu contains the following items:
– A-FM: Default value = 232 ; Do not align
– AT: Default value = 8 ; Do not align
– CMT:Default value = 42 (do not align)
AT2:Default value = 200, do not align (not for Nafta)
QSS:Off = for mono set, On = Stereo Set
FMI:Off = for mono set, On = Stereo Set
The audio adjustments sub menu is not available in Mono sets.
The presence of an item in the menu is dependent on the selected soundboard (option setting).
Pressing UP or DOWN selects the next or previous item.
Pressing LEFT or RIGHT increases or decreases the value of the selected item. The changed values will be sent directly to the related hardware. The item values are stored in NVM if this sub menu is left.
No alignment is needed for AUDIO (use default values)

27. VG2 alignment HOW? EXERCISE SAM January 2001
VG2 Alignment (cut off voltages)
Use a pattern generator to display a blank raster.
Tune the pattern generator to a frequency of MHz (channel 3)
Switch on the TV to channel 3 by pressing the CH+/CH- keys..
Press the "MENU" key on the RC key
Select BRIGHTNESS / CONTRAST and change the value to 0 with the LEFT/RIGHT keys.
Adjust VG2 potentiometer (located on the LOT 5445) by measure the black current pulese.
Method of Measurements :
Ground the scope at the CRT panel. Connect the 10:1 probe at any cathodes of the picture tube socket (pins 7 - RED, pin 9 - GREEN and pin 3 - BLUE).
Measure the level of the black current measuring pulses.
Screen Size Cut-Off Point (V)
L01S
14”/17”/20”/15RF +140V  4 V
21” V  4 V
L01L
BLD/HF/21RF/21FSQ +125V  4V
BLS/25V/25RF/27V/29SF/29RF/32V/35V +145V  10 V
The VG2 adjustment has now been completed.
Press the “MENU” key on the RC.
Select “Brightness” & “Contrast” and change both value to 31 with the LEFT/RIGHT keys.

28. VG2 alignment (cut off voltages)
EXERCISE SAM
January 2001
VG2 alignment (cut off voltages)
Use a pattern generator to display a blank raster.
Tune the pattern generator to a frequency of MHz (channel 3)
Switch on the TV to channel 3 or by pressing the CH+/CH- keys..
Press the "MENU" key on the RC key
Select BRIGHTNESS / CONTRAST and change the value to 0 with the LEFT/RIGHT keys.
Adjust VG2 potentiometer (located on the LOT 5445) by measure the black current pulses.
Method of Measurements :
Ground the scope at the CRT panel. Connect the 10:1 probe at any cathodes of the picture tube socket (pins 7 - RED, pin 9 - GREEN and pin 3 - BLUE).
Measure the level of the black current measuring pulses.
Screen Size Cut-Off Point (V)
L01SS
14”/17”/20”/15RF +140V  4 V
21” V  4 V
L01LS
BLD/HF/21RF/21FSQ +125V  4V
BLS/25V/25RF/27V/29SF/29RF/32V/35V +145V  10 V
The VG2 adjustment has now been completed.
Press the “MENU” key on the RC.
Select “Brightness” & “Contrast” and change both value to 31 with the LEFT/RIGHT keys.

29. Vertical Amplitude and position Horizontal Amplitude and phase
EXERCISE SAM
January 2001
GEOMETRY
Vertical Amplitude and position
Horizontal Amplitude and phase
HOW?
Geometry adjustments
Set pattern generator to MHz (CHANNEL 3) and select Circle and Small Squares pattern.
Connect generator to aerial input.
Enter SAM by RC sequence " STATUS key".
Switch TV to channel 3 by pressing the CH+/CH- keys.
Enter SAM and select GEOMETRY with up/down keys on the RC. Use the left/right keys to adjust the selected item in order to achieve correct picture geometry.
Switch the set to standby.

30. Vertical Amplitude and position Horizontal Amplitude and phase
EXERCISE SAM
January 2001
GEOMETRY
Vertical Amplitude and position
Horizontal Amplitude and phase
Geometry adjustments
Set pattern generator to MHz (CHANNEL 3) and select Circle and Crosshatch (Small Square) pattern.
Connect generator signal to “tuner” input.
Enter SAM by RC sequence " STATUS key".
Switch TV to channel 3 by pressing the Channel 3 or CH+/CH- keys.
Enter SAM and select GEOMETRY with up/down keys on the RC. Use the left/right keys to adjust the selected item in order to achieve correct picture geometry.
Switch the set to standby.

31. WHITE TONE HOW? EXERCISE SAM check values NORMAL
January 2001
WHITE TONE
check values NORMAL
check values DELTA WARM
check values DELTA COOL
HOW?
White tone
Connect a pattern generator to aerial input and select colour bar and circle pattern.
Tune the pattern generator to a frequency of MHz (channel 3)
Switch on the TV set.
Entering SAM by RC sequence " STATUS key".
Switch TV to channel 3.
Select WHITE TONE menu
Select either NORMAL, DELTAWARM, or DELTACOOL depending on item to be aligned. Only one of the three items (R, G or B) will be displayed on the screen.
The default values for the colour temperatures are as follows:-
NORMAL K R = 40 G = 40 B = 40
(DELTA)COOL K R = -2 G = 0 B = 6
(DELTA)WARM K R = 2 G = 0 B = -7
Switch the set to standby.

32. EXERCISE SAM WHITE TONE check values NORMAL check values DELTA WARM
January 2001
WHITE TONE
check values NORMAL
check values DELTA WARM
check values DELTA COOL
Connect a pattern generator signal to “tuner” input and select colour bar and circle pattern.
Tune the pattern generator to a frequency of MHz (channel 3)
Switch on the TV set.
Entering SAM by RC sequence " STATUS key".
Switch TV to channel 3.
Select WHITE TONE menu
Select either NORMAL, DELTAWARM, or DELTACOOL depending on item to be aligned. Only one of the three items (R, G or B) will be displayed on the screen.
The default values for the colour temperatures are as follows:-
NORMAL K R = 40 G = 40 B = 40
(DELTA)COOL K R = -2 G = 0 B = 6
(DELTA)WARM K R = 2 G = 0 B = -7
Switch the set to standby.

33. L Compair Mode
January 2001
NEW SERVICE TOOL

34. L01 Fault Finding January 2001 Error codes explanation
Error 0 = No error
Error 1 = X-ray
Error 2 = High beam current protection and Horizontal protection
Error 3 = Vertical / Frame protection
Error 4 = Sound processor I2C error (MSP3415D)
Error 5 = Video start-up error (POR bit) / +8v protection
Error 6 = General I2C error
Error 7 = Power Down (over current ) protection
Error 8 = EW protection
Error 9 = Eeprom I2C error
Error 10 = Tuner I2C error
Error 11 = Black current loop instability protection
Error 12 = Pip Processor I2C error
Blinking LED
The contents of the error buffer can be made visible via “blinking LED", especially useful when there is no picture.
When entering SDM, the LED will repeatedly blink the number of times, equal to the last (newest) error code.

35. Error codes are generated when :
L Fault Finding
January 2001
Error codes are generated when :
An incorrect I2C bus response is received by the microprocessor (UOC).
I2C device fails to provide its I2C bus acknowledgement.
Over voltage / current protection.
Horizontal / Vertical protection.

36. Contents of last 5 detected errors
L Fault Finding ERR 0
January 2001
Error Code 0
A “0” in a buffer means an error has not been detected.
L01US0 1.0
SDM
ERR
Contents of last 5 detected errors

37. L01 Fault Finding ERR 1 Error Code 1 X-ray Over-voltage protection
January 2001
Error Code 1
X-ray Over-voltage protection
Symptom : Set Hiccup until it switch to protection mode.
L01US0 1.0
SDM
ERR
Possible causes  check 2407, 7402 (SS), 2465, 7460 LS)

38. L01 Fault Finding ERR 2 Error Code 2
January 2001
Error Code 2
High Beamcurrent, Horizontal protection
Symptom : Fly Back Line after 5 sec in protection mode
L01US0 1.0
SDM
ERR
Possible causes  check Video Supply, LOT 5445, Horizontal Deflection Coil

39. Vertical / Frame protection
L Fault Finding ERR 3
January 2001
Error Code 3
Vertical / Frame protection
Symptom : One Horizontal line after 5 sec in protection mode
L01US0 1.0
SDM
ERR
Possible causes  check VlotAux+13v, +50v (LS), 7471, Vertical Deflection Coil

40. Audio fault, MSP I2C error Symptom : Set turn on without sound output.
L Fault Finding ERR 4
January 2001
Error Code 4
Audio fault, MSP I2C error
Symptom : Set turn on without sound output.
L01US0 1.0
SDM
ERR
Possible causes  check Vlotaux +5V, +8v, 7831, 3832, 3833, 7861, 3865, 3866

41. L01 Fault Finding ERR 5 Error Code 5
January 2001
Error Code 5
No Start-up (POR) & +8v protection.
Symptom : Set in protection mode
L01US0 1.0
SDM
ERR
Possible causes  check 3.3v & +8v, 7560,7480

42. Symptom : Set in protection mode
L Fault Finding ERR 6
January 2001
Error Code 6
General I2C error - SDA / SCL not Responding
Symptom : Set in protection mode
L01US0 1.0
SDM
ERR
Possible causes  check SDA / SCL  7600, 7601, 1000, 7831 or 7861,7803

43. L01 Fault Finding ERR 7 Error Code 7
January 2001
Error Code 7
Power Down (Audio over current) protection
Symptom : Set in protection mode
L01US0 1.0
SDM
ERR
Possible causes  check MainAux, 7561,7562

44. L01 Fault Finding ERR 8 Error Code 8 EW protection (Large Screen Only)
January 2001
Error Code 8
EW protection (Large Screen Only)
Symptom : Geometry out or set in protection mode
L01US0 1.0
SDM
ERR
Possible causes  check VlotAux +11v, 3400, 3405, 3406, 7400

45. L01 Fault Finding ERR 9 Error Code 9 Eeprom I2C error L01US0 1.0 SDM
January 2001
Error Code 9
Eeprom I2C error
Symptom : Set turn on but Not able to storage of data
L01US0 1.0
SDM
ERR
Possible causes  check 3.3 volt, 7601

46. L01 Fault Finding ERR 10 Error Code 10 Tuner I2C error L01US0 1.0 SDM
January 2001
Error Code 10
Tuner I2C error
Symptom : Set turn on with snow (No picture & sound)
L01US0 1.0
SDM
ERR
Possible causes  check VlotAux +5 volt, 1000

47. L01 Fault Finding ERR 11 Error Code 11 Black current loop protection
January 2001
Error Code 11
Black current loop protection
Symptom : Fly Back Line after 5 sec in protection mode
L01US0 1.0
SDM
ERR
Possible causes  check Video Supply +200v, CRT Panel

48. L01 Fault Finding ERR 12 Error Code 12 PIP Processor I2C error
January 2001
Error Code 12
PIP Processor I2C error
Symptom : Picture In Picture (PIP) not function.
L01US0 1.0
SDM
ERR
Possible causes  check +5 v & +8v, PIP panel 7803, 7890, 7891

49. 2. Over voltage protection
L PRACTICAL EXERCISE
January 2001
1. Deflection
2. Over voltage protection
3. No start-up
4. No picture
5. Half picture (vert. deflection)
6. Screen without picture & sound

50. L01 PRACTICAL EXERCISE 1 Deflection Fault
January 2001
Deflection Fault
Symptom : Set is dead, set makes hiccuping sound
Task : switch on set
verify the problem
locate the problem
Hint: Desolder coil 5561 to isolate mainsupply from other supplies. What happens with hiccuping
Deliverable:
Write down the cause and the way to repair the set
Answer:
Mainsupply is available, Hiccuping stops when desoldering 5561,
meaning that problem is in mainsupply line.
however no output voltages present at LOT, no horizontal deflection
due to defective line transistor Q7460.
EXERCISE 1 – SIMULATION DEFLECTION FAULT (A2)
Preparation: Short circuit emitter/collector of Q7460.
Complaint: Set is dead, set makes hiccuping sound
Task:
. switch on set
. verify the problem
. locate the problem
Hint:
Desolder coil 5561 to isolate mainsupply from other
supplies. What happens with hiccuping?
Deliverable: Write down the cause and the way to repair the set
Answer: Mainsupply is available, Hiccuping stops when desoldering 5561, meaning that problem is in mainsupply line. however no output voltages present at LOT, no horizontal deflection due to defective line transistor Q7460

51. L01 PRACTICAL EXERCISE 2 Over voltage protection
January 2001
Over voltage protection
Symptom : Set in hiccup mode, shut down after 8 sec (in protection mode)
Task: switch on set
verify the problem
locate the problem
Hint: In SDM mode flashing led indicates error 5
Deliverable:
Write down the cause and the way to repair the set
Answer:
As error 5 (microprocessor power on reset) and (+8 volt protection),
it is unlikely both parts are defective.
µC is not able to address the parts and puts the set in 8V protection.
Problem is caused by missing +8V due to defective of 7480.
EXERCISE 2 – SIMULATION 8 VOLT PROTECTION (A2)
Preparation: Open circuit E of 7480 (+8V)
Complaint: Set is dead
Task: . switch on set
. verify the problem
. locate the problem
Hint: In SDM mode flashing led indicates error 5
Deliverable: Write down the cause and the way to repair the set
Answer: As error 5, power on reset and +8v protection are both present it is unlikely both parts are defective.
µC is not able to address the parts and puts the set in 8V protection.
Problem is caused by missing +8V due to defective of IC7480.

52. L01 PRACTICAL EXERCISE 3 No start-up
January 2001
No start-up
Symptom : Set in hiccup (non stop) mode
Task: switch on set
verify the problem
locate the problem
Hint: Set is in over current protection mode, check the secondary sensing and VBATT.
Deliverable:
Write down the cause and the way to repair the set
Answer:
No output sensing due to defective of (o/c) optocoupler 7515
and cause the UOC stdby_con at logic HIGH (measure point 6566 of A1).
This signal is generated by the UOC during standby mode and protection
mode when over current takes place at the MainAux supply.
This signal is of logic LOW (0V) under normal operation of the set and
goes to logic HIGH (3V3) under standby & Fault condition.
EXERCISE 3 – SIMULATION OVER CURRENT PROTECTION (A1)
Preparation: Open circuit optocoupler 7581(desolder pin 1)
Complaint: set is in hiccup (non stop )mode.
Task: . switch on set
. verify the problem
. locate the problem
Hint: Set is in overvoltage protection mode, check the secondary sensing and measure the VBATT.
Deliverable: Write down the cause and the way to repair the set
Answer: No output sensing due to defective of (o/c) optocoupler 7515,
This signal is generated by the UOC during standby mode and protection mode when over current takes place at the MainAux supply. This signal is of logic LOW (0V) under normal operation of the set and goes to logic HIGH (3V3) under standby & Fault condition.

53. L01 PRACTICAL EXERCISE 4 Set No working (dead set)
January 2001
Set No working (dead set)
Symptom : set is dead
Task: switch on set
verify the problem
locate the problem
Hint: set turn on without any hiccup or switching sound from the
power supply circuit.
Check power supply IC7520
(voltage at pins 1,3,4,5,6 at about 180 volt and pin 8 is 0 volt)
Deliverable:
Write down the cause and the way to repair the set
Answer:
The power supply control IC7520 input and output pins voltage
are very high this is due to the output driver pin 6 open load.
Mosfet 7521 is not able to do switching without driver signal
from the pin 6 of power supply control IC7520.
so the problem is caused by the defective of R3523.
EXERCISE 4 – SIMULATION NO TAKE-OVER SUPPLY (A1)
Preparation: Open circuit R3523 (no output driver from power supply control IC 7520 to switching FET 7521.
Complaint: set is dead
Task: . switch on set
. verify the problem
. locate the problem
Hint: set turn on without any hiccup or switching sound from the
power supply circuit.
Check power supply IC7520
(voltage at pins 1,3,4,5,6 at about 180 volt and pin 8 is 0 volt)
Deliverable: Write down the cause and the way to repair the set
Answer:
The power supply control IC7520 input and output pins voltage
are very high this is due to the output driver pin 6 open load.
Mosfet IC 7521 is not able to do switching without driver signal
from the pin 6 of power supply control IC7520.
so the problem is caused by the defective of R3523

54. L01 PRACTICAL EXERCISE 5 Half picture (vert. deflection)
January 2001
Half picture (vert. deflection)
Symptom : Set turn on with half screen appear on bottom, Sound OK.
Task: switch on set
verify the problem
locate the problem
Hint: In SDM flashing led shows error 3 indicating frame protection.
Deliverable:
Write down the cause and the way to repair the set
Answer:
As Vlotaux+11 volt & +50 volt are okay.
problem is expected to be in vertical amplifier IC 7471.
By using scope measure the Output from pin 17 of the UOC waveform is okay but the input of the FRAME Vdrive + signal is missing.
so the problem is caused by open Vdrive +, Due to defective of (o/c) R3244.
EXERCISE 5 – SIMULATION VERTICAL DEFLECTION FAULT (A3)
Preparation: Open circuit R3244, to open Vdrive + line
Complaint: Set turn on with half screen appear on bottom, Sound OK.
Task: . switch on set
. verify the problem
. locate the problem
Hint: In SDM flashing led shows error 3 indicating frame protection
Deliverable: Write down the cause and the way to repair the set
Answer: As Vlotaux+11 volt & +50 volt are okay.
problem is expected to be in vertical amplifier IC 7471.
By using scope measure the Output from pin 17 of the UOC waveform is okay but the input of the FRAME Vdrive + signal is missing.
So the Problem is caused by open circuit Vdrive + due to defective of (o/c) R3244.

55. L01 PRACTICAL EXERCISE 6 Screen without Picture & Sound
January 2001
Screen without Picture & Sound
Symptom : Set turn on without picture and Sound.
Task: switch on set
verify the problem
locate the problem
Hint: Screen with snow, OSD and other menu function okay.
In SDM flashing led shows error 11
Deliverable:
Write down the cause and the way to repair the set
Answer:
problem is expected to be in the Tuner 1000.
As Vlotaux +5 volt at tuner pin5 & 7 are okay, missing VT Supply at the tuner pin 9.
Problem is caused by defective of (o/c) R3460.
EXERCISE 6 – screen without picture (A2 & 4)
Preparation: Open circuit R3460, VT_Supply (turning voltage)
Complaint: Set turn on without picture and sound (snow on screen).
Task: . switch on set
. verify the problem
. locate the problem
Hint: screen with snow , OSD and other menu function okay.
In SDM flashing led shows error 11.
Deliverable: Write down the cause and the way to repair the set
Answer:
problem is expected to be in the Tuner 1000.
As Vlotaux +5 volt at tuner pin5 & 7 are okay, missing VT Supply at the tuner pin 9.
Problem is caused by defective of (o/c) R3460.

56. January 2001

57. Viele grusse aus Holland