Sharp 29H-FG3RU, Руководство по обслуживанию

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21
29H-FG3RU
21-1
21-2
TROUBLE SHOOTING TABLE (Continued)
NO NORMAL SOUND
Set volume to maximum. Is there any sound output signal at pin 10 & 14 of IC 301 ?
Yes
No
Check if there is sound input signal at pin 2 & 21 of IC 301.
No
Check output signal at pin 68, 69 of IC 2100 and its related circuit.
Check connection to the speaker
No sound from the speaker
No sound comes out at AV-out J905 Check sound output signal from pin 92 & 93 of IC 2100 and its related circuit.
Check TU51.
TROUBLE SHOOTING TABLE (Continued)
NO PICTURE
Does the snow noise appear on the screen at maximum contrast and brightness ?
A
Snow noise increase.
Does 5V appear at pin 7 of TU 51 ?
Check the PC+5V line.
No
Does 31V appear at pin 9 of TU 51 ?
Check +120V line at IC 753
and its related circuit.
Yes
No
Yes
No
Yes