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Global Service1 January 2001 CTV Chassis L01 L01 Trouble Shooting 1.

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Presentation on theme: "Global Service1 January 2001 CTV Chassis L01 L01 Trouble Shooting 1."— Presentation transcript:

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2 Global Service1 January 2001 CTV Chassis L01 L01 Trouble Shooting 1

3 Global Service2 January 2001 Service 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. L01 Service Position

4 Global Service3 January 2001 L01 Repair facilities 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

5 Global Service4 January 2001 Test points  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 L01 Service Test points

6 Global Service5 January 2001 The Service Mode consists of:- Service Mode L01 Service Mode Service Default Mode (SDM) Service Alignment Mode (SAM) Customer Service Mode (CSM) Computer Aided Repair Mode (Compair Mode)

7 Global Service6 January 2001 Customer Service Mode MUTE (on RC) + any key At local keyboard for at least 4 secs. Entering CSM Exit CSM TV off with mains switch Any key on RC With CSM Picture and sound at last status setting *note: volume at default 25 % Service unfriendly modes ignored L01 Customer Service Mode

8 Global Service7 January 2001 L01 Customer Service Mode 1 L01BCD X.Y CSM 2 CODESXXXXXXXXXX 3 OPXXXXXXXXXXXXXXXXXXXXX 4 DETECTED SYSTEMDETECTED AUDIO 5 NOT TUNEDSKIPPED 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 Benefits : Reduce non technical Fault

9 Global Service8 January 2001 L01 EXERCISE CSM 1. Put set in CSM 2. Check “L01BCD X.Y” software cluster & version 3. Check “CODES” error status 5. Check picture & sound setting status 4. Check “OP”options setting

10 Global Service9 January 2001 L01 Service Default Mode RC (remote control) MENU or Jumper - short circuit 9631 / 9641 Entering SDM Exit SDM RC (remote control) - STANDBY

11 Global Service10 January 2001 L01 Service Default Mode SDM Short circuit 9631 & 9641

12 Global Service11 January 2001 L01 Service Default Mode Software versionS D M indication Contents of last 5 detected errors L01US0 1.0SDM ERR SDM : Diagnostic Error, DC voltage and waveform Measurement

13 Global Service12 January 2001 The last five error code numbers are stored No error Error code Means two errors in the buffer, the last error detected is 2, the previous error is 3 L01 Error Code history example

14 Global Service13 January 2001 L01 Error Number LED ON LED OFF START Error 2 Error 11

15 Global Service14 January 2001 L01 EXERCISE SDM 1. Put set in SDM with RC or S/C Jumper 2. Check Software version 3. Read contents error buffer

16 Global Service15 January 2001 L01 Service Alignment Mode RC STATUS Entering SAM Exit SAM RC - STANDBY (error buffer cleared) or Local Keyboard - Volume Down & Channel Down while in “SDM” mode

17 Global Service16 January 2001 L01 Service Alignment Mode L011US1 1.0 SAM ERR00000 XXXXXXXXXXXXXXXXXXXXX Clear Clear? Options AKB 0 Tuner White Tone Geometry Audio S A M indication OB(n) - Option Byte Value Operation hours timerSoftware version Contents of last 5 detected errors Clear Error Buffer

18 Global Service17 January 2001 L01 SAM - Options sub menu

19 Global Service18 January 2001 L01 Options Structure Option Structure

20 Global Service19 January 2001 L01 Options Bit Assignment Option Bit Assignment Follows are the option bit assignment for all L01 software clusters.

21 Global Service20 January 2001 L01 Options Bits Setting (example)

22 Global Service21 January 2001 L01 Nafta Large Screen Op Setting Nafta software cluster option setting (LS) Up Dated US0 = Service Naming3US0 = Development Software NamingNote:

23 Global Service22 January 2001 L01 Nafta Small Screen Op Setting Nafta software cluster option setting (SS) Up Dated

24 Global Service23 January 2001 SAM - Tuner sub menu

25 Global Service24 January 2001 SAM - White Tone sub menu Cool Normal Warm DELTA COOL RED DELTA COOL GREEN DELTA COOL BLUE NORMAL RED NORMAL GREEN NORMAL BLUE DELTA WARM RED DELTA WARM GREEN DELTA WARM BLUE White Tone No alignment is needed for white tone (use default values)

26 Global Service25 January 2001 L01 SAM Geometry sub menu Geometry Vertical ItemDescription HPHorizontal Parallelogram HBHorizontal Bow HSHHorizontal Shift EWWEast-West Width EWPEast-West Parabola UCPEW Upper Corner Parabola LCPEW Lower Corner Parabola EWTEast-West Trapezium Horizontal ItemDescription VSLVertical Slope VAMVertical Amplitude VSCVertical S-correction VSHVertical Shift VXVertical Zoom SBLService Blanking

27 Global Service26 January 2001 SAM - Audio sub menu No alignment is needed for AUDIO (use default values)

28 Global Service27 January 2001 EXERCISE SAM VG2 alignment HOW?

29 Global Service28 January 2001 EXERCISE SAM 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 SizeCut-Off Point (V) L01SS 14”/17”/20”/15RF+140V  4 V 21”+150V  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.

30 Global Service29 January 2001 EXERCISE SAM GEOMETRY Vertical Amplitude and position Horizontal Amplitude and phase HOW?

31 Global Service30 January 2001 EXERCISE SAM 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.

32 Global Service31 January 2001 EXERCISE SAM WHITE TONE check values NORMAL check values DELTA WARM check values DELTA COOL HOW?

33 Global Service32 January 2001 EXERCISE SAM 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 10500KR = 40G = 40B = 40  (DELTA)COOL14000KR = -2G = 0B = 6  (DELTA)WARM 8200KR = 2G = 0B = -7  Switch the set to standby.

34 Global Service33 January 2001 NEW SERVICE TOOL L01 Compair Mode

35 Global Service34 January 2001 L01 Fault Finding

36 Global Service35 January 2001 Error codes are generated when : L01 Fault Finding 4An incorrect I 2 C bus response is received by the microprocessor (UOC). 4I 2 C device fails to provide its I 2 C bus acknowledgement. 4Over voltage / current protection. 4Horizontal / Vertical protection.

37 Global Service36 January 2001 Error Code 0 Error Code 0 A “0” in a buffer means an error has not been detected. L01 Fault FindingERR 0 Contents of last 5 detected errors L01US0 1.0SDM ERR

38 Global Service37 January 2001 Error Code 1 Error Code 1 X-ray Over-voltage protection Symptom : Set Hiccup until it switch to protection mode. L01US0 1.0SDM ERR Possible causes  check 2407, 7402 (SS), 2465, 7460 LS) L01 Fault Finding ERR 1

39 Global Service38 January 2001 Error Code 2 Error Code 2 High Beamcurrent, Horizontal protection Symptom : Fly Back Line after 5 sec in protection mode L01US0 1.0SDM ERR Possible causes  check Video Supply, LOT 5445, Horizontal Deflection Coil L01 Fault FindingERR 2

40 Global Service39 January 2001 Error Code 3 Error Code 3 Vertical / Frame protection Symptom : One Horizontal line after 5 sec in protection mode L01 Fault FindingERR 3 L01US0 1.0SDM ERR Possible causes  check VlotAux+13v, +50v (LS), 7471, Vertical Deflection Coil

41 Global Service40 January 2001 Error Code 4 Error Code 4 Audio fault, MSP I 2 C error Symptom : Set turn on without sound output. L01 Fault FindingERR 4 Possible causes  check Vlotaux +5V, +8v, 7831, 3832, 3833, 7861, 3865, 3866 L01US0 1.0SDM ERR

42 Global Service41 January 2001 Error Code 5 Error Code 5 No Start-up (POR) & +8v protection. Symptom : Set in protection mode L01 Fault FindingERR 5 Possible causes  check 3.3v & +8v, 7560,7480 L01US0 1.0SDM ERR

43 Global Service42 January 2001 Error Code 6 Error Code 6 General I 2 C error - SDA / SCL not Responding Symptom : Set in protection mode L01 Fault FindingERR 6 Possible causes  check SDA / SCL  7600, 7601, 1000, 7831 or 7861,7803 L01US0 1.0SDM ERR

44 Global Service43 January 2001 L01 Fault FindingERR 7 Error Code 7 Error Code 7 Power Down (Audio over current) protection Symptom : Set in protection mode Possible causes  check MainAux, 7561,7562 L01US0 1.0SDM ERR

45 Global Service44 January 2001 Error Code 8 Error Code 8 EW protection (Large Screen Only) Symptom : Geometry out or set in protection mode L01US0 1.0SDM ERR Possible causes  check VlotAux +11v, 3400, 3405, 3406, 7400 L01 Fault FindingERR 8

46 Global Service45 January 2001 Error Code 9 Error Code 9 Eeprom I 2 C error Symptom : Set turn on but Not able to storage of data L01 Fault FindingERR 9 L01US0 1.0SDM ERR Possible causes  check 3.3 volt, 7601

47 Global Service46 January 2001 Error Code 10 Error Code 10 Tuner I 2 C error Symptom : Set turn on with snow (No picture & sound) L01 Fault FindingERR 10 L01US0 1.0SDM ERR Possible causes  check VlotAux +5 volt, 1000

48 Global Service47 January 2001 Error Code 11 Error Code 11 Black current loop protection Symptom : Fly Back Line after 5 sec in protection mode L01US0 1.0SDM ERR Possible causes  check Video Supply +200v, CRT Panel L01 Fault FindingERR 11

49 Global Service48 January 2001 Error Code 12 Error Code 12 PIP Processor I 2 C error Symptom : Picture In Picture (PIP) not function. L01US0 1.0SDM ERR Possible causes  check +5 v & +8v, PIP panel 7803, 7890, 7891 L01 Fault FindingERR 12

50 Global Service49 January 2001 L01 PRACTICAL EXERCISE 1. Deflection 2. Over voltage protection 3. No start-up 4. No picture 5. Half picture (vert. deflection) 6. Screen without picture & sound

51 Global Service50 January 2001 L01 PRACTICAL EXERCISE 1 DeflectionDeflection 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.

52 Global Service51 January 2001 L01 PRACTICAL EXERCISE 2 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.

53 Global Service52 January 2001 L01 PRACTICAL EXERCISE 3 No start-up 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. 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

54 Global Service53 January 2001 L01 PRACTICAL EXERCISE 4 Set No working (dead 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. 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

55 Global Service54 January 2001 L01 PRACTICAL EXERCISE 5 Half picture (vert. deflection) Answer: As Vlotaux+11 volt & +50 volt are okay. problem is expected to be in vertical amplifier IC 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. 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

56 Global Service55 January 2001 L01 PRACTICAL EXERCISE 6 Screen without Picture & Sound Answer: problem is expected to be in the Tuner 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. 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

57 Global Service56 January 2001

58 Global Service57 January 2001 Viele grusse aus Holland


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