Sharp 29WF200, Service Manual

Page: 17 / 68

17
17-1
17-2
29WF200
29WF500
TROUBLE SHOOTING FLOWCHART (Continued)
Normal
No snow noise.
Check pin (6) and (7) IC201.
Abnormal
B
Noise or signal appear. Is AV1, AV2, AV3 or input normal?
Check Q405 and their peripheral circuit.
Check TU51(TUNER), SF201 and its related parts.
Yes
No
Check pin (43) of IC1900 noise or signal appear?
Check IC1900 and its peripheral circuit.
No
Yes
Check pin (39) of IC201 noise or signal appear? Check IC1900, IC1901 Q1901, and their peripheral circuit.
Check IC201 RGB out Normal?
Check IC201 and their peripheral circuit.
Check the peripheral circuits of screen heater (FBT) and the CRT.
Check IC850 and their peripheral circuit.
Yes
Are pin (7), (8) and (9) of IC850.
Yes
No
No
Yes
No
(Noise)
(Noise)
(Signal)
(Signal)
No
Yes
Yes
No
Is there audio signal at pins (46), (48) of IC1900?
Check IC1900 and its peripheral circuit.
Check TU51 peripheral parts.
Check TU51 and its peripheral circuits of no problem, set the sound system inpositon.
TROUBLE SHOOTING FLOWCHART (Continued)
NO NORMAL SOUND
Is audio output terminal J901 normal.
Yes
Yes
No
No
Check TV sound.
Is there audio signal at pins (2), (23) of IC3501?
Change the sound system. Is sound normal?
Check IC1900 peripheral parts.
Is there audio signal at pin (2) and (5) of IC361? No
No
Yes
Check IC3501.
Yes
Check IC361, and their peripheral parts.
Set S-Volume at maximum. Do pins (5), (20) of IC3501 work?
Check IC4301 and their peripheral circuit.