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Model No: CT-14GT9A_14GT9CP_14GT9N_14GT9R       

 

                                    

Version 1.0 

19

 

 

TRANSISTOR  STATIC OPERATING POINT & IC’s OHMIC RESISTANCE TO  GROUND 

 

Item 

No 

B 

Base 

C 

Collector

 

E 

Emitter    

IC OHMIC RESISTANCE TO GROUND 

( Use  R x 1K Range,  With  

−

VE Black  Probe to Ground ) 

V585  0.10 

20 

0. 

Type 

No 

Pin 

No 

Value 

( 

Ω

 ) 

Pin 

No 

Value 

( 

Ω

 ) 

Type 

No 

Pin 

No 

Value 

( 

Ω

 ) 

Pin 

No 

Value 

( 

Ω

 ) 

V703  0.50 

4.43 

0.10 

1 

1.75K 

2 

1.2K 

1 

6.80M 

2 

0.5K 

V183  0.02 

0 

0.10 

3 

1.75K 

4 

0.002K 

3 

7.30M 

4 

27.53K 

V182  0.10 

0.10 

0.10 

5 

1.75K 

6 

1.76K 

5 

6.90M 

6 

6.91K 

V804  0.09 

0.10 

0.10 

7 

1.70K 

8 

1.80K 

7 

0.002K 

8 

0.42K 

V102  0.68 

0 

0.10 

9 

0 

10 

1.80K 

9 

7.50M  10 

5.10K 

V106  4.30 

4.99 

4.99 

11  1.58K  12 

1.52K 

11  11.85K  12 

11.0K 

V553  6.87  35.90 

6.30 

13  1.64K  14 

1.02K 

13 

5.22K 

14 

7.15K 

V586  0.10  24.96 

0.10 

15 

0 

16 

1.67K 

15 

7.25K 

16 

7.19K 

V704  0.10 

4.96 

0.13 

17  1.53K  18 

1.75K 

17 

3.27K 

18 

0.36K 

V141  0.10 

0.64 

0.61 

19  1.72K  20 

17.0K 

19 

5.67K 

20 

5.60K 

V185  0.02 

0 

0.10 

21  16.3K  22 

4.95K 

21 

2.50K 

22 

7.30K 

V181  0.10 

0.10 

0.10 

23  1.56K  24 

1.60K 

23 

2.20K 

24 

7.19K 

V702  4.55 

5.22 

5.25 

25  1.60K  26 

1.65K 

25 

0.50K 

26 

8.93K 

V803  0.10 

2.80 

1.60 

27  1.69K  28 

1.78K 

27 

1.40K 

28 

6.80K 

V591  0.10 

0.10 

0.10 

29  1.85K  30 

1.78K 

29 

4.70K 

30 

7.20K 

V101  1.33 

7.07 

0.58 

31  1.00K  32 

1.60K 

31  0.548K  32 

∝

 

V105  5.01 

0.20 

4.99 

33  1.50K  34 

1.60K 

33  0.002K  34 

7.20K 

V107  5.01 

0.10 

4.99 

35  1.83K  36 

1.75K 

35  7.038K  36 

7.28K 

V511  11.7 

0.50 

11.5 

37  1.83K  38 

1.75K 

37 

7.00K 

38 

7.30K 

V512  0.50 

0.50 

0 

39  1.75K  40 

1.70K 

39 

7.04K 

40 

2.00K 

V513  0.50 

300 

0 

CPU CHTO400

 

41  1.69K  42 

1.73K 

41  0.002K  42 

7.50K 

V431  0.20 

17.0 

0 

1 

0 

N811 

( LA4225 ) 

43  0.429K  44 

7.30K 

V582  25.0 

24.4 

24.3 

2 

0.56K  Pin 

No 

Value 

( 

Ω

 ) 

45 

0.40K 

46 

0.72K 

V583  9.50 

11.3 

9.00 

3 

∝

 

1 

1.62K 

47 

7.31K 

48 

0.93K 

V702  4.50 

5.10 

5.20 

4 

1.67K 

2 

0 

49 

0.99K 

50 

7.32K 

V801  1.50 

0 

2.10 

5 

1.30K 

3 

0 

51 

7.24K 

52 

7.35K 

6 

1.50K 

4 

1.00K 

53 

7.27K 

54 

7.43K 

Transistor Operating Point 

during  PAL Color Bar Signal 

reception condition . 

N301 ( LAT840 )

 

7 

1.45K 

5 

1.70K 

LA76810A 

 

 

 

 

 

 

 

 

 

 

 

Содержание CT-14GT9A

Страница 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 ...

Страница 2: ...odel No CT 14GT9A_14GT9CP_14GT9N_14GT9R Version 1 0 2 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 1 1 14 4 4G G GT T T9 9 9 CHASSIS CN ER MODEL CT 14GT9A CT 14GT9CP CT 14GT9N CT 14GT9R ...

Страница 3: ...ONTENTS Specifications 04 04 X Ray Radiation Precaution 05 05 Safety Precaution 05 05 Product Safety Notice 05 05 Alignment and Test Instructions 06 14 Electrical Parameters of Main IC and Components 15 19 Troubleshoot Flowchart 20 24 Schematic Diagram 25 28 ...

Страница 4: ...NTSC P B Picture Tube 14 37cm diagonal Ext Antenna 75 Ohm Coaxial Cable Ext In Out Audio Video in out Audio Output 2W 2W THD 7 Volts A AC100 260V 50 60Hz R N CP AC150 260V 50 60Hz Power Consumption 14 60W Dimension 14 450 W x 410 D x 378 H mm Net Weight 14 10 kg REMOTE CONTROL Transmitting System Infra red Power Supply DC 3V 1 5Vx2 Design and specifications are subject to change without prior noti...

Страница 5: ...ny dynamic service to avoid possible shock hazard 2 Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube The picture tube is highly evacuated and if broken glass fragment will be violently expelled Use shatter proof goggles and keep picture tube away from the unprotected body while handling 3 When replacing a chassis in the cabinet always be certai...

Страница 6: ...V has several sets of AV IN terminals check every AV IN channel d If the TV has S VIDEO IN terminals check the S VIDEO IN channel e If the TV can output AV stereo inspect the AUDIO IN L R channels respectively Note It s not necessary to check SECAM signal input if the TV can t receive SECAM signals AV Output Inspection a Power on the TV to receive Z16 white full field signal in the TV mode b Check...

Страница 7: ...nspection Method a Check and make sure that both picture and sound are normal when the TV receives 90dB signal and signal to noise ratio is O K with 90dB signal reception If not press the AGC button to adjust AGC data until the above requirements are fulfilled b Check signals from other channels and ensure that the picture and sound are normal Inspection for Sound Intermediate frequency SIF Inspec...

Страница 8: ...e anode high voltage tester The readings are shown as below Table Test Point Type of voltage Voltage Value V Heater pin of socket Heater voltage 6 3 0 3V CRT anode Small neck High voltage 25 1 5kV CRT anode Large neck High voltage 26 1 5kV CRT anode True flat High voltage 26 5 1 5kV CRT anode 14 High voltage 21 5 1 5kV Inspection for Purity and Convergence Purity Inspection Receive white full fiel...

Страница 9: ...primary color accounting for a large proportion of the three primary colors RGB as reference for example if the bright line is more green take G gun as reference Adjust dark balance of the other two primary colors with the remote transmitting jig but not adjust the reference gun Roughly set the bright line to white f The horizontal line should not be too bright or too dark If the line is too brigh...

Страница 10: ...ll off the cord plug XS701 Inspection and Adjustment of Sub Brightness and Contrast h Adjustment Equipment i Remote transmitting jig j Oscilloscope Methods of Inspection and Adjustment k Power on the TV to receive CH 21 pattern signal l The inspection and adjustment should be done after completion of adjustments of white balance and focus m Set the picture mode to VIVID n Press the SUB BRI button ...

Страница 11: ...Model No CT 14GT9A_14GT9CP_14GT9N_14GT9R Version 1 0 11 ...

Страница 12: ...n signal is good If not repeat above steps c f NTSC Video Geometry Adjustment a Switch on the TV to receive CH I0 NTSC circle pattern signal b Press the H CEN button on the remote transmitting jig to adjust H CEN data so that horizontal center of the picture coincides with horizontal center of the CRT c Press the V SIZE button on the remote transmitting jig to adjust V SIZE data so that the video ...

Страница 13: ...ellow and blue respectively tops and bottoms of the third left vertical line and third right vertical line turn blue and yellow respectively f Receive SECAM color bar signal Check if the color bars arrange in the order of white yellow dark green green purple red blue and black and color is normal For the TVs with SECAM signals reception g Receive NTSC M color card signals Check and make sure that ...

Страница 14: ... coil over 20M ohm 18 Inspection for Weak Signals and Remote Functions For the TVs through safety test inspect open circuited reception with signal strength of 40dB and functions of the front panel and remote controller 19 To Increase Decrease Voltage The TV should work normally when the supply voltage ranges from 160V AC to 260V AC Point the remote transmitting jig directly to the remote sensor t...

Страница 15: ...Model No CT 14GT9A_14GT9CP_14GT9N_14GT9R Version 1 0 15 Electrical Parameters Of Main IC And Components BIMOS IC Pins and Function BIMOS IC LA76810 ...

Страница 16: ...Model No CT 14GT9A_14GT9CP_14GT9N_14GT9R Version 1 0 16 CPU IC Pins and Function CPU IC CHT0400 ...

Страница 17: ...Model No CT 14GT9A_14GT9CP_14GT9N_14GT9R Version 1 0 17 EEPROM IC Pins and Function EEPROM ST24C04 Sound Amplifier IC Pins and Function Sound Amplifier IC LA4225 ...

Страница 18: ...Model No CT 14GT9A_14GT9CP_14GT9N_14GT9R Version 1 0 18 Vertical IC Pins and Function Vertical IC LA7840 ...

Страница 19: ...0K 19 5 67K 20 5 60K V185 0 02 0 0 10 21 16 3K 22 4 95K 21 2 50K 22 7 30K V181 0 10 0 10 0 10 23 1 56K 24 1 60K 23 2 20K 24 7 19K V702 4 55 5 22 5 25 25 1 60K 26 1 65K 25 0 50K 26 8 93K V803 0 10 2 80 1 60 27 1 69K 28 1 78K 27 1 40K 28 6 80K V591 0 10 0 10 0 10 29 1 85K 30 1 78K 29 4 70K 30 7 20K V101 1 33 7 07 0 58 31 1 00K 32 1 60K 31 0 548K 32 V105 5 01 0 20 4 99 33 1 50K 34 1 60K 33 0 002K 34 ...

Страница 20: ...0V Supply Normal Check for Open circuit Components R520 R524 V511 V512 C515 C517 and etc Check for Rectifier Filter Circuit V513 and associate components D701 pin31 voltage Low Voltage Level D701 pin31 voltage High Voltage Level Check and replace D701 if faulty Check for Open circuit Components R520 R524 V511 V512 C515 C517 and etc Check for Open circuit Components VD551 N505 V511 V512 C515 C517 D...

Страница 21: ...al Measure 0 30V tuning voltage is it normal D701 pin 8 PWM output signal waveform variation is it normal Check X tal Osc Circuit G701 C709 C710 D701 and Keyboard D701 band selection voltage is it normal 0V Keyboard input normal but no respond to remote controller Check V581 VD533 C500 V702 D704 C712 and replace if found faulty components with the Check IR receiver unit HS0038 Abnormal Respond to ...

Страница 22: ...place N101 or readjust Service Align Mode parameters Check N101 pin 46 42 40 and associate components Check N101 pin 22 and associate components Check D701 pin 37 V801 V804 VD555A C908 V901 V905 CRT Check and replace N101 D701 if faulty Not normal O K Normal Yes No Check N101 Pin 38 39 associate circuit components any faulty components Color Picture but abnormal brightness Replace faulty component...

Страница 23: ...t No Sound Reception of AV Signal input Any sound output Check N101 pin 9 and associate circuit Check V183 b high voltage level Check N181 pin 5 voltage level is it normal Check RF565 C189 VD557 C565 Check C185 VD183 and N181 Loud Speaker Check related low noise amplifier circuit V185 R188 D701 Yes No Normal No Yes No ...

Страница 24: ...ents C224 C226 C249 C250 VD251 VD209 R209 V583 D554 RF569 if faulty replace bad component with same type no Check N101 pin 30 37 external connected C269 R268 is it normal Check N101 pin 27 23 for horizontal and vertical output signal waveform Check and replace N101 Check V431 V432 T501 T432 N401 and associate components Check and replace faulty component C269 R268 Yes No Abnormal Normal Normal Abn...

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