Sharp SX68JS10, Service Manual

Page: 19 / 62

19
SX68JS10
Check TU200, Q204 etc. Does 5V appear at pin (7) of TU200.
Check L201, IC751 etc.
No
Yes
TROUBLE SHOOTING TABLE (Continued)
NO PICTURE
Does the snow noise appear on the picture tube at max contrast and brishtness control?
C
Snow noise increase.
Does 9V appear at pin (6) of TU200 (TUNER).
Check IC750, L202, TU200 etc.
No
Does 33V appear at pin (9) of TU200.
Check IC753, L203 etc.
Yes
No
Yes
No
TROUBLE SHOOTING TABLE (Continued)
Normal
No snow noise.
Check pin (19) of TU200.
Abnormal
C
Noise or signal appear. Is AV1, AV2, AV3 or DVD input normal?
Check Q200, Q201, Q203 and their peripheral circuit.
Check TU200(TUNER) and its related parts.
Yes
No
Check pin (36) of IC401 noise or signal appear?
Check IC401 its peripheral circuit.
No
Yes
Check pin (15) of IC801 noise or signal appear? Check IC400, Q404, Q410, Q412 and their peripheral circuit.
Check IC801 RGB out Normal?
Check IC800, IC802, IC803 and their peripheral circuit.
Check the peripheral circuits of screen heater (FBT) and the CRT.
Check IC3801, IC3802, IC3803 and their peripheral circuit.
Yes
Are pin (8) of IC3801, pin (8) of IC3802 and pin (8) of IC3803.
Yes
No
No
Yes
No