Thursday, 29 January 2015

Color TV Service Manual CT-1401R, CT-2101M, CT-2102S.

Color TV Service  Manual CT-1401R, CT-2101M, CT-2102S.


FAULTS CHECK POINTS
Set  Dead Check For Short , Z-501MOV, C507 220UF / 500V,Check Bridge rect.diode D-500 C504 1KPF/ 1KV, C501 Cap 0.1/250VAC, RT501PTC, V513 Tr.C4460, Fuse Open
Tr 4460 Blow Off Check , Open R525 68E 2W , C516 680PF 2KV, VD551 RU3AM,  SMPS Short (Collector winding)
Check 250V DC at Collector Of Tr4460  – No DC Open F3.15T ,R502 NTC, Line Filter,SMPS Collector Winding (Pin no3& 7),
 250V DC at Collector Of Tr4460  – OK Check , Open R520  or  521 120K 1/2W, R522 15K , Open / Short VD517 FR107 , VD518 IN 4148, Zener VD519 7.5V ,Tr.V511 2SA1015, Tr. V512 C-3807,OPTO Coupler EL817 B, Tr. V553 2SC1815, VD561 Z 6.2V,VD551 RU3AM Check , Open R552, 100K 1/2W, R554 150K 1/2W ,R555 47K 1/2W SMPS Winding (1 &2)
+ B , 112V At Cathode of VD551,  Not Constant Def.Preset RP551 2K, R552 100K 1/2W, R554 150K 1/2W ,R555 47K 1/2W
+ B  112V  --- Low 90 to 100V DC / Supply Fluctuating Replace Elco C561 120UF / 160V,Opto-Coupler,Preset 2K
+ B , 112V At Cathode of VD551, RU-3AM OK
Check +B ,112 V at Collector of TR V432 D1803     No  Open L503 100UH,FBT Winding pin No 2 & 4 , Check copper Track Of FBT pin 2 & 4 Short Tr 1803 Collector to Emmiter
112 V at Collector of TR V432 D1803     OK   
Check +12V Supply At cathode of VD554 FR154     No  Check SMPS winding (12 & 8),Open / Short Diode VD554 FR154, Short Elco C564 470 /35V Short Elco C564 470 /35V ,  Open R580 , 1E / 2W 
Check +12V Supply At cathode of VD554 FR154   OK 
Check +5V Supply At cathode of VD703A Z5.1V     No  Open R580 , 1E / 2W , R570 150E 2W, Short VD703A Zener 5.1V &  Elco C571 ,100/16V def. IC 8873 Supply pin no 9 & 55 Short to Ground, Memory IC 24C16 Pin No 8 To Ground  & its 5V Supply filter Components
 +5V Supply At cathode of VD703A Z5.1V     OK 
Is St. By LED is Glowing   Yes
TV Set Still Dead Check 5.1V at SCL & SDA Line of 8873 pin No57 & 58  ,  Memory IC pin No 5 & 6 Open R717 & 718,  If still Abnormal Replace ICCheck 5.1 V at Reset pin no 5 of IC 8873,if Abnormal replace Tr.V702 , 2SA1015Y, Zener VD703 3.6V , IC 8873, Crystal 24 Mhz & its Cap.22PF / 50V St. By voltage at pin No 64 of IC 8873  ON  2.1V ,Off - 0V  Open R746 10K  , if abnormal Replace IC 8873
St. By voltage at pin No 64 of IC 8873   OK
Check +20V Supply At Collector of Hori. Driver Tr.V431 2SC2383      No  Open, Driver Tx.T431 ,BCT10F Primary Winding, R434 150E,2W SMPS Winding (11 &  8 ),  Open / Short VD553 FR 157, Tr 2SC2383 
Still  No Supply , +20 V  De-Solder Collector of Driver Tr.2383 & Check Supply at Driver Tx   ----  OK Re-Solder Collector of Tr2383
Check + 8V Supply At pin No 17 (H.Vcc)of IC8873  – Drop / Abnormal /4V  De-Solder H.Vcc pin & Check if  8V is Ok, Replace IC8873
 8V Supply At pin No 17 (H.Vcc)of IC8873  – NO Check St.By Command at Base of Tr.V552, 2SC1815 ON- 0.6V, Off 0V, if abnormal Check / replace IC 8873 , V552 Tr 1815 , & V554 Tr.B772,  12V Supply components of SMPS , VD554, C564 & SMPS.
Check + 9V Supply At pin No 3 of  N551 Regulator 7809    No 
Check + 12V Supply At pin No 1 of  N551 Regulator 7809    No 
+8V Supply At pin No 17 (H.Vcc)of IC8873 OK
TV Set Still Dead Check C227 8k2pf, R226 8k2 , C228 0.47 / 50V, Memory IC 24C16
H.Out Tr Blow Off Open C435 8k2PF 2KV, DY Hori.Winding Short , Replace FBT,
One Vertical Line In The Center of The Screen Open DY.Horizontal Winding,Linearity Coil L411, 37UH,C441 0.39UF/250V,DY Connector
One Horizontal.Line in The Center of the Screen Check Vert Drive, 3V Aprox.at At pin No 1Of 78040 If Abnormal check 5V at pin No36 & 47 & 3V at pin No 49 Of IC8873, Check 5V & 9V Supply Line,replace 8873, C226 .1UF Check +25V at pin 2 & pin 6 Of IC 78040 if Abnormal replace VD 551 IN4007 & Elco C451 100/50V ,IC78040 Check 3V appox. at pin No 7 of IC78040  if Abnormal,Check / replace R227 10K,R454 4.7K C455 1U/50V ,& 9V Supplyof N551 78040 Also Check R459  1E 1/ 2W,R455 10K,R456 33K,  DY Vert.Winding open/ dry
Vert. Picture Less / Fold Check / Replace C226  0.1UF , C457 1000 /25V
Vert. Linearity Out Check / Replace C456 2.2UF / 50V R458 820E
No Raster / Light on Screen Check Filament Res.R491 , FBT, & CRT Filament continuity 
No Raster , Retrace Lines Appear, When We Increase The Screen Voltage Check +180V At Junction of R907, 917, 927 on CRT base Check / Replace VD522A ,FR157 C562 10UF / 250v & SMPS pin 10 & 8 Check / Replace   3V At pin no 49 of  8873, Zener VD 202,C236 4K7 / 100V, R444, 12K Check / Replace   9V Supply CRT Base, Tr.V932 1815, VD933 IN4148, Check RGB Drive Voltage, 2V at pin No 50,51,& 52 At IC 8873 Check / Replace VD 204,205,206 Zener 9.1V, IC 8873 , Memory IC,
Low Brightness Check Screen voltage Adjustment , replace C939 1 KF 2KV on CRT Base Check/replace R235 27K , R232 10K C231& 235 , 0.1UF  , IC 8873,
No Picture / Snow Not OK/ Low Gain Check 5V at pin No 6 & 7 of Tuner , & Pin 36 Of IC8873 If Abnormal check / replace 5V regulator N552 , Tuner Check AGC Voltage at Tuner , With Signal 1.3V, W/O Signal 4V If Abnormal check / replace Tuner ,Saw filter SY8915, IC8873
Auto Tuning Not Working / Snow OK Check 33V at pin No 9 of Tuner, If Abnormal check / replace N705 32V Zener R781 10K2W,Tuner
No Sound Check Sound System in main menu ,Should be in B/G. +Audio Supply at pin No 7 Of IC LA44402. If abnormal Check / Replace R563,0.68E / 2W, IC 44402,Speakers. VD555,FR308,C565 1000UF/25V ,SMPS winding 13 & 14. Check Mute Command at Pin No 6 Of IC44402, TV ON  3V, Off -0V. If Abnormal check / replace IC 8873 , 44402, R723 10K,R738 8k2. Pin No 31 & 33 of IC 8873 (SIF IN & SIF Out Components). C209 22KPF / 100V Poly At pin No 38 of 8873
For Stereo Model Also Check 5.1V,SCL & SDA Voltage At pin No 23 & 24 Of IC TA1343. Check 9V Supply at pin no 20 Of IC 1343. check/replace Ic 1343 , 8873,10UF / 50V,C606,C610 
Pop -UP Sound with Mains On – Off Check Tr.V690 2SA1015, C690 220UF / 16V, Supply 9V
Plain Raster Check 5V & 9V Supply Of IC8873 Check / Replace  C208 , 2.2UF / 50V ,C213 .047/50V , IC8873
A/V    No picture / No Sound Check TV /AV Command At pin No 2 of 8873 & Pin No 9,10,11 of IC 4053 TV Mode – 0V , AV Mode – 5V. For Video: Check / Replace Elco C242 1UF / 50Vat pin no 24 Of  IC8873, IC4053,VD802 Z 9.1V. For Audio: Check / Replace 10UF /50V , C240, C821 , C822,  IC8873, IC4053
No Color / B&W Picture OK Check 5V & 9V Supply Of IC8873 Check / Replace Elco C205 .22/50V,C203 2K2PF ,R207 30K
Red Color Missing In Picture Ground , Momenterily Red Cathode Of CRT , & See Red Retrace lines on Screen If Red Retrace Line Appears ,CRT OK,     if Not, Check CRT Socket & CRT Check Aprox.165V DC at Collector of V902 Tr.2482 If Ok Check / Replace R908 , 2K7 1/2W If 165V abnormal Check / Replace  V902 Tr2482,R907 15K2W,R906 470E,R904 4K7,R902 100E,IC8873
Green Color Missing In Picture Ground , Momenterily Green Cathode Of CRT , & See Green Retrace lines on Screen If Green Retrace Line Appears ,CRT OK,  if Not,  Check CRT Socket & CRT Check Aprox.165V DC at Collector of V912 Tr.2482 If Ok Check / Replace R918 , 2K7 1/2W If 165V abnormal Check / Replace  V912 Tr2482,R917 15K2W,R916 470E,R914 4K7,R912 100E,IC8873
Blue Color Missing In Picture Ground , Momenterily Blue Cathode Of CRT , & See Blue  Retrace lines on Screen If Blue Retrace Line Appears ,CRT OK,     if Not,  Check CRT Socket & CRT Check Aprox.165V DC at Collector of V922 Tr.2482 If Ok Check / Replace R928 , 2K7 1/2W If 165V abnormal Check / Replace  V922 Tr2482,R927 15K2W,R926 470E,R924 4K7,R922 100E,IC8873
Retrace Lines ,   Red / Green / Blue Color Check / replace  CRT Socket, Respective Amp.Tr.2482, RGB Drive voltage 8873 , CRT
Remote Not Working  Check 5V at pin no 3 of IR If abnormal check / replace R 06 1K, C1 22uf, & IR Receiver Check Appox.4.5V at pin No 1 Of  IR & at 63 No pin of  IC8873 If Abnormal check / replace IC8873, IR Receiver,IR connector, & GND of IR.
Operating Unit Not working Check 5V DC at Key pin no 3 Of IC8873 If Abnormal check / replace R732 33K ,R731 1K ,C710 .01UF/ 50V, IC8873 & Wire Conn.




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INTEX ALL MODEL COLOUR TV REMOTE SERVICE MODE, ALL MODEL PHOTO, SPARE PARTS LIST ( TUNNER, REMOTE, CROMA, SYSTEM,SMPS, AUDIO, VERTICAL, HORIZONTAL ) CIRCUIT DIAGRAM, USER MANUAL, OPERATING INSTRUCTION, AND MANY MORE IN THIS BLOG SHOWN IN SEPARATE PAGES.
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