Service Bulletin : - How to Remove Colour Patch in the TV set
Steps : -
Color Patch on
TV Screen
1). Check the set condition after using external degaussing coil as per below process:
Press & hold ON/OFF Switch & start rotating Degaussing Coil
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
Service Bulletin : - 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:
Purity
Magnet
Magnet Part Code :
1100003636
3). Patch will get removed in the set, do external degaussing
again to verify the patch in the set
Set condition after using
magnet in the set
Purity
Magnet
Magnet Part
Code :
1100003636