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Trouble shooting table (Continued)
B NO PICTURE
No snow noise. Does the snow noise appear
Snow noise increase. contrast and brightness control? Check pins (6) and (7) of IC800.
Yes on the picture tube at max No
B
Does 5V appear at pins (6) and (7) No Check IC600, L200, TU200 of TU200 (TUNER)? and etc.
Yes Normal Abnormal
Does 31V appear at pin (9) of No Check IC1751, L201 and etc. TU200? Noise or signal Check TU200, SF200 and appear. their related parts.
Yes
Check TU200, TP201 and etc. Is AV1, AV2 or AV3 Yes input normal? Check Q455 and its
peripheral circuit.
No
17
Which does pin (43) of IC400 appear, noise or signal? Which does pin (39) of Are waveform at pins (7), (8) IC800 appear, noise or and (9) of IC850 normal? signal? IC400, Q401 Check IC800 and and their its peripheral
Noise Check IC400 and its
peripheral circuit.
Signal
Signal Is IC800 RGB Yes
out Normal?
Noise Yes No
Check the Check IC850 and peripheral circuits its peripheral of screen heater circuit. (FBT) and the CRT.
circuit.
29WF50
17-1 17-2
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