1. Color Patch on TV Screen Color Patch Repair Guide
How to Remove Colour Patch in the TV set
Color Patch on TV Screen
Color Patch Repair Guide

2. S A M T E L COLOR PATCH ON CRT SCREEN
COLOR PATCH LOCATION ON CRT SCREEN

3. COLOR PATCH ON CRT SCREEN
S A M T E L

4. S A M T E L WHY COLOR PATCH ? COLOR PATCH ON CRT SCREEN
MISLANDIND AT CORNERS ( ONE COLOR ENTER INTO ANOTHER COLOR )
NO PROPER CORRECTION OF LANDING AT CORNERS IN CRT
DIRECTIONAL EFFECTS
2. MISLANDIND & CHANGE IN LANDING AT CORNERS
( ONE COLOR ENTER INTO ANOTHER COLOR )
DUE TO EXTERNAL UNDESIRED MAGNETISM
RECEIVER INTERIORS
LEAKAGE FLUX OF FBT, POWE TRANSFORMER ETC.
LEAKAGE FLUX OF RESTRICTED CURRENT OF ADG COIL
LEAKAGE FLUX OF SPEAKERS
BY MAGNETIZING OF CHASSIS AND OTHER SHEET METAL
INTERNAL DEGAUSING AMP TURN ( AT )

5. S A M T E L COLOR PATCH ON CRT SCREEN RECEIVER EXTERIORS
EFFECT BY GROUND MAGNETISM AND STEEL STRUCTURE
LEAKAGE FLUX FROM HIGH VOLTAGE TRANSMISSION CABLE( AC FREQUENCY )
EXTERNAL SPEAKERS
OTHER FACTORS
3. MISLANDIND & ONE SIDE SHIFTED LANDING AT
AT LEFT AND RIGHT POINT
DUE TO POOR YAMMING AND UNBALANCED LANDING AT LEFT
AND RIGHT POSITION IN CRT
MAJOR CHANGE IN GROUND MAGNETISM ( VERTICAL )
4. MISLANDIND DUE TO DOMING EFFECT AT LEFT
AND RIGHT POSITION OF CRT
POOR LANDING / YAMMING AT DOMING POINTS ( L / R )
BRIGHT PICTURE ( MORE LUMINANCE ) FOR A LONG TIME

6. S A M T E L COLOR PATCH ON CRT SCREEN COLOR PATCH REPAIR
1. MISLANDIND AT CORNERS
( ONE COLOR ENTER INTO ANOTHER COLOR )
2. MISLANDIND & CHANGE IN LANDING AT CORNERS
EXTERNALLY DEGAUSS THE CRT FACE / SET
CONFIRM THE PATCH & LOCATION
ATTACH RUBBER MAGNET TO FUNNEL AT PATCH CORER
COVER RUBBER MAGNET COMPLETELY WITH ACETATE TAPE
( IF POSSIBLE )

7. COLOR PATCH ON CRT SCREEN
S A M T E L
COLOR PATCH REPAIR

8. S A M T E L COLOR PATCH REPAIR COLOR PATCH ON CRT SCREEN
RECEIVER INTERIORS
LEAKAGE FLUX OF FBT, POWE TRANSFORMER ETC.
LEAKAGE FLUX OF RESTRICTED CURRENT OF ADG COIL
LEAKAGE FLUX OF SPEAKERS
BY MAGNETIZING OF CHASSIS AND OTHER SHEET METAL
INTERNAL DEGAUSING ( AT ), PTC, RESISTANCE, SHAPE ETC
V IMP
RECEIVER EXTERIORS
EFFECT BY GROUND MAGNETISM AND STEEL STRUCTURE
LEAKAGE FLUX FROM HIGH VOLTAGE TRANSMISSION CABLE
( AC FREQUENCY )
EXTERNAL SPEAKERS
OTHER FACTORS

9. S A M T E L COLOR PATCH REPAIR COLOR PATCH ON CRT SCREEN
3. MISLANDIND & ONE SIDE SHIFTED LANDING AT
AT LEFT AND RIGHT POINT
SLIDING ( OPENING AND CLOSING ) OF 2 POLE TO ENSURE
BALANCED LANDING / NO PATCH AT LEFT AND RIGHT

10. S A M T E L COLOR PATCH REPAIR COLOR PATCH ON CRT SCREEN
SLIDING ( OPENING AND CLOSING ) OF 2 POLE TO ENSURE
BALANCED LANDING / NO PATCH AT LEFT AND RIGHT

11. S A M T E L COLOR PATCH REPAIR COLOR PATCH ON CRT SCREEN
4. MISLANDIND DUE TO DOMING EFFECT AT LEFT
AND RIGHT POSITION OF CRT
POOR LANDING / YAMMING AT DOMING POINTS ( L / R )
o BRIGHT PICTURE ( MORE LUMINANCE ) FOR A LONG TIME
USE 2 POLE BY
SLIDING TO COMPROMISE
BEST LANDING AT L / R AND
AT DOMING POINTS
IF REQUIRED MOVE DY BACK
AND ENSURE BEST LANDING AT
L / R AND AT DOMING POINTS

12. Color Patch on TV Screen Color Patch on TV Screen
How to Remove Colour Patch in the TV set
Color Patch on TV Screen
Steps : -
1). Check the set condition after using external degaussing coil as per below process:
2). If Patch removed properly, then check the internal degaussing of set as per below process
& if not then do as per the process in next slide:
a). Create the patch in the ON set either by degaussing coil or by rotating the set as below:
b). Switch OFF the set in patch condition for 10 mins from mains supply
c). Switch ON the set & check whether patch removed or not.
d). If patch removed that means Internal degaussing in set is OK.
e). But if patch is still available that means internal degaussing (either D.Coil, PTC or relay circuit) is faulty
& main reason of Patch in the set
3). Open the set & check the PTC & D.Coil Resistance by multimeter as below:
PTC Resistance : 9, 14 or 18 ohm in OK condition as per specs otherwise faulty
Degaussing Coil Resistance : 13 ohm in OK condition as per specs otherwise faulty
4). In case of any of above faulty, replace the same otherwise check relay circuit
Check Switching Transistor in the path of 12V to relay & relay signal from MICON
5). Replace the faulty part either switching transistor or relay to correct the internal degaussing in set
Color Patch on TV Screen

13. Set condition after using magnet in the set
How to Remove Colour Patch in the TV set
Color Patch
Steps :
1). If problem remains in the set, even after using external
degaussing coil as shown in picture
2). apply purity magnets to back side of CPT on DY
(Note: Magnets to apply with back side of same where
patch occurs) as below:
3). Patch will get removed in the set, do external degaussing
again to verify the patch in the set
Purity Magnet
Magnet Part Code :
Magnet Part Code :
Purity Magnet
Set condition after using magnet in the set

14. Convergence Poles Info
2 Pole:-It is used to adjust purity for purity lending
(Not required in field)
-Identification on Pole is “P”
4 Pole:-It is used to adjust Vertical & horizontal RED & BLEU Lines individually
- Identification on Pole is “4”
6 Pole:-It is used to adjust Vertical & horizontal RED & BLEU Lines at a same time
-Identification on Pole is “6”