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16

Model No: 14RBS3Wn
Version 1.0

5.

CPU does not work

In television, remote-control system is similar with the computer system. In theory, it can work if it
holds two conditions as follow:

1) The power supply: In general, it is 5V, the error is not above 10% and the disturbance

pulse is as small as possible.

2) The clock pulse: In TB 1238 circuit, the clock pulse is generated by pin31/ pin32 of

N701 and a 8M crystal oscillator.

Television s remote-control system also needs reset circuit that can preset the values in internal register.
The circuit around pin33 of N701 is called auto-reset circuit. If CPU detects errors in resetting, it will
come to the state of programme protected.
The detail checking and repairing steps are as follow:

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Содержание 14RBS3WN

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: ...2 CHASSIS TB1238 MODEL 14RBS3WN...

Страница 3: ...3 Model No 14RBS3Wn Version 1 0 CONTENT TB 1238 SERIES I2 C BUS CONTROL INSTRUCTION 4 TYPICAL FAILURE ANALYSE 6 VARIOUS PARAMETERS OF INTEGRATED CIRCUIT 20 CIRCUIT DIAGRAM 22 EXPLODED VIEW 23...

Страница 4: ...C 00 50Hz pillow distortion correction 7 BRTC 30 Brighter center 41 DPCS 00 50 60Hz pillow distortion correction 8 COLC 50 Color center 42 KEY 00 50Hz keystone distortion 9 TNTC 40 Tint center 43 KEYS...

Страница 5: ...enter 33 HIT 19 50 Hz vertical size 67 OSD 00 OSD width adjustment 34 HPS 02 50 60Hz horizontal center 68 OPT 27 Option 69 MOD3 07 Language 70 ZOOM IN HIT 3F Zoom in height 71 ZOOM OUT HIT 0b Zoom out...

Страница 6: ...TYPICAL FAILURE ANALYSE 1 Three None no raster no picture no sound This failure is mainly caused by big power circuit such as power supply horizontal scanning vertical scanning The detail checking an...

Страница 7: ...s sent the power off signal Check if V706 is broken down 1V 0V Yes 0V 4 5 5 5V Cut off W320 Test other voltage such as 180V 24V and 12V V553 VD561 RP551 R 5 6 9 V 7 0 6 V 5 1 2 C513 VD515 V511 Check V...

Страница 8: ...small signal processing circuits Before checking these circuits a kind of practical test method is introduced It is called Signal input way The detail is described as follow W e can use the resistance...

Страница 9: ...if there is snow noise wave disturbance on the CRT via usi ng Signal input way by touching pin 6 and pin8 of N201 5V Check N203 L203 C239 N201 No Yes Observe if there is snow noise wave distur bance...

Страница 10: ...s the small signal circuit to work correctly with the picture on the CRT and we only check the sound signal processing and sound amplification circuit The repairing method B1 may be referred without p...

Страница 11: ...if there is the vo ice liking Ka ka in the loudspeaker via using Signal input way by touching pin1 and pin3 of N30 1 Hear if there is the vo ice liking Ka ka in the loudspeaker via using Signal input...

Страница 12: ...circuit does not work this kind of failure will happen In deflection yoke there only has horizontal sweeping The electron beam in the CRT only moves in the horizontal orientation so form this failure...

Страница 13: ...bnormal Normal Check VD 401 N4 01 Measuring the waveform on pin4 of N401 Check R259 C403 N401 0V 24V Abnormal Measuring the waveform on pin2 of N401 Normal Check N401 Normal Abnormal Check R402 L401 R...

Страница 14: ...d 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 def...

Страница 15: ...e The horizontal yoke is opened or not Repair CRT Yes Whether XS401 is opened No Check if there is bad solder between X S 4 0 1 a n d t h e m a i n b o a r d Yes Check L407 L408 VD411 C443 especial in...

Страница 16: ...rbance pulse is as small as possible 2 The clock pulse In TB 1238 circuit the clock pulse is generated by pin31 pin32 of N701 and a 8M crystal oscillator Television s remote control system also needs...

Страница 17: ...4 98V Check the voltage on the emitter of V705 4 98V Check R741 Check the voltage on the positive pole of VD 704 4 98V 4 98V 3 6V Check R753 VD704 3 6V Check R754 V705 R752 Check the voltage on the p...

Страница 18: ...use by the circuit of character generated and located Most of reasons are that the horizontal and vertical flyback pulse signals do not come to CPU We can judge this failure by measuring the wave of t...

Страница 19: ...s No Observe if there is oscillating wave on the pin28 29 of N701 Check L701 N701 No Yes Check the horizontal and vertical flyback pulse on the pin26 and pin 27 of N701 Check N701 Yes Check the wave o...

Страница 20: ...27 VOL 2 4V 2 5V 6 1V 4 6V 5 3V 1V 1 8V 3 9V 4 1V FUNC G OUT B OUT ABL V RAMP V FB V OUT V AGC SCL SDA PIN 28 29 30 31 32 33 34 35 36 VOL 9 3V 3 8V 0 4V 4V 2V 0V 1 3V 5 3V 3V FUNC H VCC ID CW FBP IN S...

Страница 21: ...A DATA PIN 19 20 21 22 23 24 25 26 27 VOL 0V 0V 0V 0V 0V 0V 0V 4 4V 4 8V FUNC SGV KARA ENA GND OSD R OSD G OSD B OSD Y HD VD PIN 28 29 30 31 32 33 34 35 36 VOL 5V 5V 0V 1 4V 2 2V 5V 0 6V 4 5V 4 8V FUN...

Страница 22: ...ed 5 Product safety should be considered when a component replacement is made in any area of a receiver The values of the components indicated by a mark in this circuit diagram have special Significan...

Страница 23: ...23 Model No 14RBS3Wn Version 1 0 EXPLODED VIEW...

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