Slide 1

Color Patch on TV Screen How to Remove Colour Patch in the TV set Color Patch Repair Guide Slide 2 COLOR PATCH LOCATION ON CRT SCREEN S A M T E L COLOR PATCH ON CRT SCREEN Slide 3 S A M T E L Slide 4 1.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 ) WHY COLOR PATCH ? S A M T E L COLOR PATCH ON CRT SCREEN Slide 5 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 S A M T E L COLOR PATCH ON CRT SCREEN Slide 6 COLOR PATCH REPAIR 1. MISLANDIND AT CORNERS ( ONE COLOR ENTER INTO ANOTHER COLOR ) 2. MISLANDIND & CHANGE IN LANDING AT CORNERS ( ONE COLOR ENTER INTO ANOTHER COLOR ) 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 ) S A M T E L COLOR PATCH ON CRT SCREEN Slide 7 COLOR PATCH REPAIR S A M T E L COLOR PATCH ON CRT SCREEN Slide 8 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 COLOR PATCH REPAIR S A M T E L COLOR PATCH ON CRT SCREEN Slide 9 SLIDING ( OPENING AND CLOSING ) OF 2 POLE TO ENSURE BALANCED LANDING / NO PATCH AT LEFT AND RIGHT 3. MISLANDIND & ONE SIDE SHIFTED LANDING AT AT LEFT AND RIGHT POINT COLOR PATCH REPAIR S A M T E L COLOR PATCH ON CRT SCREEN Slide 10 SLIDING ( OPENING AND CLOSING ) OF 2 POLE TO ENSURE BALANCED LANDING / NO PATCH AT LEFT AND RIGHT COLOR PATCH REPAIR S A M T E L COLOR PATCH ON CRT SCREEN Slide 11 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 COLOR PATCH REPAIR S A M T E L COLOR PATCH ON CRT SCREEN Slide 12 Color Patch on TV Screen How to Remove Colour Patch in the TV set 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 Slide 13 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 Color Patch How to Remove Colour Patch in the TV set Magnet Part Code : 1100003636 Purity Magnet Set condition after using magnet in the set Purity Magnet Magnet Part Code : 1100003636 Slide 14 6 Pole 2 Pole:-It is used to adjust purity for purity lending (Not required in field) -Identification on Pole is P 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 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 6 Pole:-It is used to adjust Vertical & horizontal RED & BLEU Lines at a same time -Identification on Pole is 6 Convergence Poles Info