akira CT-21FGS1 Service Manual Download | Manualshive

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Model No: CT-21FGS1
Version 1.0

4. Only vertical line in the middle of the screen

This is a dangerous failure. It probable causes flashover and smoking inside the set. Don’ t let your TV work for a long time as this failure appears. Because the electron beam can not move in the horizontal orientation, the failure
should be in the horizontal deflection circuit. We mainly check the open-circuit fault in horizontal deflection circuit. The detail checking and repairing steps are as follow:

YES

YES

NO

Vertical line

Repair CRT

The horizontal yoke is opened or not

Whether “ XZ411” is opened

Check if there is bad solder between XZ411, and the main board

Check L414, VD403, C412,C415,especial in inductive components and connector

NO

All manuals and user guides at all-guides.com

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Summary of Contents for CT-21FGS1

Page 1: ...C C Co o ol l lo o ou u ur r r T T TV V V S S Se e er r rv v vi i ic c ce e e M M Ma a an n nu u ua a al l l All manuals and user guides at all guides com a l l g u i d e s c o m ...

Page 2: ...del No CT 21FGS1 Version 1 0 M M Mo o od d de e el l l G G Gr r ro o ou u up p p C C CT T T 2 2 21 1 1F F FG G GS S S1 1 1 CHASSIS A21T01 TB1238 MODEL CT 21FGS1 All manuals and user guides at all guides com ...

Page 3: ...NT GERAL DESCRIPTION 4 SAFETY INSTRUCTION 6 CIRCUIT ADJUSTMENT 7 FAULT FINDING TREES DIAGRAMS OVERVIEWS 14 VARIOUS PARAMETERS OF INTEGRATED CIRCUIT 22 ELECTRICAL PART LIST 30 CIRCUIT DIAGRAM 40 All manuals and user guides at all guides com ...

Page 4: ...1 shows the block diagram of AKTP01 A21T01 Table 1 provides A21T01 mainly ICs and functions Figure 2 shows the whole set power supply system for AKTP01 A21T01 Figure 3 shows the system control circuit of AKTP01 A21T01 Table 1 A21T01 mainly ICs and functions Location Type Function Description D901 87CM38N 3GN5 87CK38N 2B46 System control microprocessor D902 AT24C08 EEPROM N101 LA7910 Band decoder N...

Page 5: ...R IF VIDEO CK HROMA DEF N201 TB1238AN AV1 AV2 switching N203 CD4053BE TV AV switching N252 CD4053BE SOUND SYSTEM SWITCH N202 CD4052BE 8 8 L R 4 15 2 2 L OUT R OUT V OUT 14 L IN1 R IN1 V IN1 L IN2 R IN2 V IN2 12 2 5 13 1 3 TUNER TUN101 SIF TRAPS Z235 Z238 SIF BPS Z231 Z234 1 2 4 12 14 15 V10 1 SAW F Z101 6 7 2 35 SECAM DECODER N251 TA1275AZ 15 13 1 3 5 1 21 3 3 3 3 29 Y R Y B Y SCP OUT SID OUT 1 2 ...

Page 6: ... of the CRT and the chassis in case of electric shock c Wear a pair of goggles when handling the CRT to avoid broken pieces damaging your eyes d Do not hold the CRT neck in case of causing damage to the CRT 2 When the power cord needs replacing use the same one as that provided by AKIRA factory 3 Voltage exists between the hot and cold ground when TV is in operation Install a separation transforme...

Page 7: ...ving the receiver is normally unnecessary providing the receiver is properly degaussed upon installation The degaussing coil operates for about 1 second after the power to the receiver is switched ON If the set is moved or faced in a different direction the power switch must be switched off at least 30 minutes in order that the automatic degaussing circuit operates properly Should the chassis or p...

Page 8: ...n Before Adj The set is turned on Connect the TV SG to RF input terminal of the set Adjustment procedure 1 Turn RP551 potentiometer to adjust B to specified voltage 2 Check voltages for video out vertical out circuit work and audio power out as follow Voltage volt 14 inch 21 inch Tolerance Video Out 145 188 5V Vertical Out 26 26 1V Circuit Work 13 13 1V Audio Power Out 19 for 3W 22 for 5W 19 for 3...

Page 9: ...input signal stereo should be observed on the oscilloscope Item General adjustment AKTP01 chassis Measuring Equipment SG No 1 and No 2 service remote controller and user remote controller Preparation before Adj Brightness contrast and color should be set in standard Press PP key repeatedly to set the picture at MEMORY2 in standard Adjustment procedure 1 Receive the monoscope pattern signal 2 Turn ...

Page 10: ... V line Magnified drawing of part Item White balance adjustment AKTP01 chassis Measuring Equipment SG and white balance meter No 1 service remote controller Preparation before Adj Warm up the set for more than 30 min Brightness contrast and color should be set in standard Adjustment procedure 1 Receive the monoscope pattern signal 2 Press G G DRIVE key and B B DRIVE key on No 1 service remote cont...

Page 11: ...ld be set in standard Adjustment procedure 1 Receive the 5 circles pattern signal that is 50HZ vertical frequency 2 Press V LINE V SIZE V CENT and H CENT key on NO 2 service remote controller respectively to select the vertical linearity height center position and horizontal center position adjustment and then press or key to adjust the value of them respectively according to factory s specificati...

Page 12: ...signal 2 Press PIC key on user remote controller to call the menu as adjusting picture quality Adjust color brightness contrast sharpness and tint in NTSC respectively and all adjustment should be right 3 Press V key to increase the sound volume no distortion heard at maximum level press V key to decrease the sound volume no sound heard at minimum level 4 Press POWER key to switch the set into sta...

Page 13: ... C563 Recover W560 unplug XZ411 for a While then test the voltage of C563 Check V411 T402 T401 Deflection coil Check L414 VD403 C411 Deflection coil Voltage of C507 Check if V501 collect emitter Was broken down Check R502 F501 power Swich AC cord and plug Check the voltage of V501 collector Check V501 V512 F501 R502 VD503 Check T501 Test voltage of V501 base Check T501 VD517 C515 C517 V411 VD552 V...

Page 14: ...ohm scope on the circuit board ground then touch softly the test point with another pole black pole in ohm scope meanwhile observe the reactivity on the output device Note In the TV test we mainly observe the noise wave on the CRT and listen to the noise voice liking as Ka Ka from the loudspeakers a No picture Out of the 0 33V range 0V NO No picture Check the 9V voltage on A101 Check RF signal inp...

Page 15: ...bance on the CRT via using Signal input way by touching pin 35 of N201 Check V251 V212 V231 N201 Observe if snow noise wave disturbance on the CRT via using signal input way by touching pin 39 of N201 Test if there is the sync signal on the pin 36 of N201 Check N251 N201 R255 L251 Check C212 TUN101 N201 Observe if there is snow noise wave disturbance on the CRT via using Signal input way by touchi...

Page 16: ... Ka Ka in the loudspeaker via using Signal input way by touching pin4 15of N252 Hear if there is the voice liking Ka Ka in the loudspeaker via using Signal input way by touching pin 1 of N201 Check R231 C214 N201 Check D901 N252 N203 The voltage on pin 9 10 11of N252 Check 9V power supply Hear if there is the voice liking Ka Ka in the loudspeaker via using Signal input way by touching pin 2 of N71...

Page 17: ...d vertical deflection circuit s failure we have better to use an oscilloscope Abnormal Normal Normal Abnormal 24V 0V Abnormal Normal The waveform on the pin 24 of N201 Measuring the waveform on the deflection yoke Check C272 R279 N201 The voltage on pin 3 of N402 Check VD557 R550 V554 N402 Check N402 Measuring the waveform on pin 4 of N402 Check R908 C448 N402 N201 Measuring the waveform on pin 2 ...

Page 18: ...ntal orientation the failure should be in the horizontal deflection circuit We mainly check the open circuit fault in horizontal deflection circuit The detail checking and repairing steps are as follow YES YES NO Vertical line Repair CRT The horizontal yoke is opened or not Whether XZ411 is opened Check if there is bad solder between XZ411 and the main board Check L414 VD403 C412 C415 especial in ...

Page 19: ...204 is called auto reset circuit If UOC detects errors in resetting it will come to the state of programme protected The detail checking and repairing steps are as follow 4 98V 4 98V 3 6V 4 98V YES 5V NO 5V 5V D901 does not work The voltage on the pin 42 of D901 Observe if there is sine wave on the pin 31 or pin 32 of D901 with an oscilloscope Check the voltage on the positive pole of L901 NO YES ...

Page 20: ...e horizontal and vertical flyback pulse signals do not come to UOC We can judge this failure by measuring the wave of the character in an oscilloscope The detail checking and repairing steps are as follow YES NO Check FBT T402 N402 No OSD Check the wave on the pin 4 of FBT and N402 pin7 Check V922 V923 R914 VD436 R449 D901 All manuals and user guides at all guides com ...

Page 21: ... 4 20 B OUT B output 2 5 21 ABCL Automatic brightness contrast control 5 4 22 V RAMP Vertical Ramp generator capacitor connect pin 4 4 23 V NFB V NFB input 5 24 V OUT Vertical pulse signal output 1 25 V AGC V AGC filter capacitor connect pin 0 3 26 SCL IIC clock line 3 8 27 SDA IIC data line 3 9 28 H VCC Horizontal deflection supply input 9V 9 6 29 SID CW OUT SECAM identification CW signal output ...

Page 22: ...or phase loop circuit 4 8 49 VCO GND Ground IF VCO circuit 0 50 VCO Voltage control oscillating coil connecting pin 8 51 VCO Voltage control oscillating coil connecting pin 8 52 VCO VCC 9V supply input IF VCO circuit 9 53 Limiter IN Sound IF signal input 3 8 54 RIPPLE FILTER Ripple filer circuit 4 8 55 EXT AUDIO External audio signal input 3 4 56 FM DEC NF FM direct current negative feedback filte...

Page 23: ...3 SIF Output3 19 P62 RF GAIN RF GAIN ON OFF 20 P63 50 60 50 60Hz Output 21 VSS VSS GND connection 22 P64 R OSD R signal output 23 P65 G OSD G signal output 24 P66 B OSD B signal output 25 P67 Y OSD Y signal output 26 P70 HD OSD HD signal output 27 P71 VD OSD VD signal output 28 P72 OSC1 OSD oscillator connection 29 P73 OSC2 OSD oscillator connection 30 TEST TEST GND connection 31 XIN XIN 8 MHz osc...

Page 24: ... Ripple filter 7 GND Ground 8 OUT Sound output 9 Vcc2 Power supply 2 C Pin functions of N101 LA7910 Pin Symbol Function 1 OUT1 Decoder output 1 2 OUT2 Decoder output 2 3 BD1 Band control level input 1 4 BD2 Band control level input 2 5 GND Connect to ground 6 VC2 33V supply input pin 7 OUT3 Decoder output 3 8 OUT4 Decoder output 4 9 VC1 12V supply input pin All manuals and user guides at all guide...

Page 25: ...ling the black offset level 7 S ID FILTER The pin for connecting the SECAM identification filter capactitor 8 EXT R Y IN The input pin for external R Y signal 9 5V Vcc The Vcc pin for Y C processing block 10 EXT B Y IN The input pin for external B Y signal 11 GND The GND pin 12 FO ADJ FILTER The pin for connecting a capacitor for automatic adjusting circuit 13 C IN The chroma signal input pin 14 B...

Page 26: ... TV 25 22 SV3 Sub sharp center 3 58NTSC AV 25 23 ST4 Sub sharp center OTHER TV 25 24 SV4 Sub sharp center OTHER AV 25 25 SHPX Sub sharpness max difference 35 26 SHPN Sub sharpness min difference 35 27 TXCX Text RGB contrast max 35 28 RGCN Text RGB contrast min 25 29 VM0 V C D mode data 0 0E 30 VM1 V C D mode data 1 00 31 HPOS Horizontal center of 50 Hz 0A 32 VP50 Vertical centering of 50 Hz 06 33 ...

Page 27: ...Dark Balance 7D 4 GDRV Green light Balance 3B 5 BDRV Blue light Balance 3E 6 CNTX Sub Contrast Max 3F 7 BRTC Sub bright Centre 48 8 COLC Sub Color Center NTSC 40 9 TNTC Sub Tint Center 40 10 COLP Sub Color Center PAL Difference 20 11 COLS Sub Color Center SECAM 40 12 SCNT Sub Contrast 0B 13 CNTC Sub Contrast Center 30 14 CNTN Sub Contrast min 00 15 BRTX Sub bright max difference 30 16 BRTN Sub bri...

Page 28: ...BY SECAM B Y Black 08 43 SRY SECAM R Y Black 08 44 RAGC RF AGC 25 45 AFT PIF VCO center 40 46 HAFC AFC gain 00 47 V25 Volume 25 37 48 V50 Volume 50 5D 49 BRTS Sub bright difference 00 50 VM2 TB1238AN V C D mode data 34 51 MOD0 Factory data 43 52 MOD1 Factory data 70 53 MOD2 Factory data 05 54 SELF TB1238AN P40UT select 00 55 SELF VOC Self adjust VCD initial data 80 56 SELF AGC Self adjust AGC init...

Page 29: ...R201 D10B101J T Carbon resistor RT13 1 6W 100Ω 5 R207 D10B101J T Carbon resistor RT13 1 6W 100Ω 5 R210 D10B101J T Carbon resistor RT13 1 6W 100Ω 5 R216 D10B101J T Carbon resistor RT13 1 6W 100Ω 5 R218 D10B101J T Carbon resistor RT13 1 6W 100Ω 5 R220 D10B101J T Carbon resistor RT13 1 6W 100Ω 5 R222 D10B101J T Carbon resistor RT13 1 6W 100Ω 5 R225 D10B101J T Carbon resistor RT13 1 6W 100Ω 5 R226 D10...

Page 30: ...istor RT13 1 6W 1KΩ 5 R613 D10B102J T Carbon resistor RT13 1 6W 1KΩ 5 R623 D10B102J T Carbon resistor RT13 1 6W 1KΩ 5 R635 D10B102J T Carbon resistor RT13 1 6W 1KΩ 5 R703 D10B102J T Carbon resistor RT13 1 6W 1KΩ 5 R705 D10B102J T Carbon resistor RT13 1 6W 1KΩ 5 R713 D10B102J T Carbon resistor RT13 1 6W 1KΩ 5 R719 D10B102J T Carbon resistor RT13 1 6W 1KΩ 5 R720 D10B102J T Carbon resistor RT13 1 6W ...

Page 31: ...istor RT13 1 6W 10KΩ 5 R116 D10B103J T Carbon resistor RT13 1 6W 10KΩ 5 R117 D10B103J T Carbon resistor RT13 1 6W 10KΩ 5 R258 D10B103J T Carbon resistor RT13 1 6W 10KΩ 5 R291 D10B103J T Carbon resistor RT13 1 6W 10KΩ 5 R292 D10B103J T Carbon resistor RT13 1 6W 10KΩ 5 R293 D10B103J T Carbon resistor RT13 1 6W 10KΩ 5 R562 D10B103J T Carbon resistor RT13 1 6W 10KΩ 5 R906 D10B103J T Carbon resistor RT...

Page 32: ...T13 1 6W 100KΩ 5 R254 D10B104J T Carbon resistor RT13 1 6W 100KΩ 5 R259 D10B104J T Carbon resistor RT13 1 6W 100KΩ 5 R989 D10B104J T Carbon resistor RT13 1 6W 100KΩ 5 R443 D10B124J T Carbon resistor RT13 1 6W 120KΩ 5 R101 D10B224J T Carbon resistor RT13 1 6W 220KΩ 5 R262 D10B224J T Carbon resistor RT13 1 6W 220KΩ 5 R455 D10B224J T Carbon resistor RT13 1 6W 220KΩ 5 R237 D10B824J T Carbon resistor R...

Page 33: ...50 63V 15pF J C925 C2CF150J T Ceramic capacitor CC1 06A CH 50 63V 15pF J C926 C2CF150J T Ceramic capacitor CC1 06A CH 50 63V 15pF J C115 C2CF180J T Ceramic capacitor CC1 06A CH 50 63V 18pF J C283 C2CF470J T Ceramic capacitor CC1 06A CH 50 63V 47pF J C116 C2CF680J T Ceramic capacitor CC1 06A CH 50 63V 68pF J C214 C2BF101K T Ceramic capacitor CC1 06A RH 50 63V 100pF J C232 C2BF101K T Ceramic capacit...

Page 34: ...Ceramic capacitor CT81 08C 2R 1KV 1000pF K C504 C2BW102K O Ceramic capacitor CT81 08C 2R 1KV 1000pF K C505 C2BW102K O Ceramic capacitor CT81 08C 2R 1KV 1000pF K C506 C2BW102K O Ceramic capacitor CT81 08C 2R 1KV 1000pF K C553 C2BW471K O Ceramic capacitor CT81 08C 2R 1KV 470pF K C554 C2BW471K O Ceramic capacitor CT81 08C 2R 1KV 470pF K C555 C2BW471K O Ceramic capacitor CT81 08C 2R 1KV 470pF K C560 C...

Page 35: ...Capacitor CD110 35V 1000uF M C565 E20E102M Electrolytic Capacitor CD110 35V 1000uF M C700 E20E102M Electrolytic Capacitor CD110 35V 1000uF M C212 E20FR22M T Electrolytic Capacitor CD110 50V 0 22uF M C277 E20FR22M T Electrolytic Capacitor CD110 50V 0 22uF M C117 E20FR47M T Electrolytic Capacitor CD110 50V 0 47uF M C231 E20FR47M T Electrolytic Capacitor CD110 50V 0 47uF M C271 E20FR47M T Electrolyti...

Page 36: ...100V 0 1uF K C514 F20G104K T Mylar capacitor CL11 100V 0 1uF K C412 F20J394J Polypropylene capacitor CBB21 200V 0 39uF 5 C415 F20Z822J Polypropylene capacitor CBB81 1 6KV 8200PF J Ref No Part No Name Specification C501 F20R224M Polypropylene capacitor CBB62 250VAC 0 22uF L414 LXXX0040 H linear LX40 T102 TLXX0004 Coil 04b T211 TLXX0017 Coil IF DETECTOR TANK L232 L3X14R7K T Inductor LGA0307 4 7uH K ...

Page 37: ...2EB3 HZ9A2 N101 IXXX0020 IC LA7910 N251 IXXX0024 IC TA1275AZ N202 IXXX0026 IC CD4052BE N904 IXXX0080 IC upc574J CW574 N201 IXXX0023 IC TB1238AN D901 IXXX0106 IC 87CM38N 3GN5 2B46 N203 IXXX0120 IC CD4053BE N701 IXXX0033 IC AN5270 5W N711 IXXX0033 IC AN5270 5W N252 IXXX0120 IC LC4053B CD4053B N902 IXXX0118 IC TA78M09 9V N402 IXXX0043 IC LA7830 D901 IXXX0079 IC BR ST24C08 W V213 RXA1015X T Audion 2SA...

Page 38: ...6E V251 RXC945XX T Audion 2SC945 2SC1815 2SC536E V411 RXD2499X Audion 2SD2499 2SD1651 V901 RXD400XX T Audion 2SD400D Z238 FC0004XX TRAP FILTER X4 5B Z235 FC0006XX TRAP FILTER X6 5B Z236 FC0007XX TRAP FILTER X6 0B Z237 FC0008XX TRAP FILTER X5 5B Z232 FC0011XX Ceramic trap filter L6 5M Z234 FC0012XX Ceramic trap filter L6 0M Z231 FC0013XX Ceramic trap filter L5 5M Z233 FC0015XX Ceramic trap filter L...

Page 39: ...39 Model No CT 21FGS1 Version 1 0 CIRCUIT DIAGRAM All manuals and user guides at all guides com ...

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