Sanyo PLV-55WM1, Руководство по обслуживанию

Страница: 85 / 152

From previous
page
- 85 -
No picture with "INPUT
3/4/5" Video input
source
Yes
Check AV source selecting stage;
Composite video signals(Input_3/4/5) are sent to IC3001 and the
selected signal is sent to IC1101 (3D-Y/C sep. & DNR IC).
IC1101 is performed 3D-Y/C for NTSC and 3L-Y/C for PAL.
Y/C separated signals are sent to IC3101, and then decoded to com-
ponent signals.
--> Check IC3001, IC1101, IC3101, and peripheral circuit.
The stage after IC3101 is the same route as Component sources.
AV_H/V_SYNC signals are output from IC3101 and sent to IC6301,
sync separated signals HS/VS_AV from IC6301 are sent to IC1201.
H/V_AD signals output from IC1201 are sent to IC2201.
--> Check sync signals at test points TP-H/V_AD.
Troubleshooting
Check AV source selecting stage;
S-video signal (Y/C) is selected in IC3001(Selector IC) and sent to
IC3101 and then decoded to component signals.
S_SW signal (S-Video cable is connected:L) is applied on pin 14 of
IC3001, and S_Video source has priority over Video source.
--> Check S-video signal (Y/C) on IC3001 and IC3101, and peripheral
circuit.
The stage after IC3101 is the same route as Component sources.
No
Yes
No picture with "INPUT
4" S-video input source
●
No Sound
Check audio amp.and control circuit.
--> Check 33V_AUD power supply line.
-->
Check IC041(audio-amp IC), IC001(audio control IC) and periph-
eral circuit.
MUTE signal (Mute:L) is applied on pin 11 of IC041 from pin 10 of
IC001.
--> Check MUTE signal.
Is the audio signal
observed at pins 12 and
7 of IC041?
Check audio output circuit.
-->
Check speakers, connection of the terminal “K01R/K01L”.
Yes
No
Check following steps.
Check audio selecting circuit.
All of the audio input signals are selected in IC3001.
-->
Check IC3001 and peripheral circuit.
Is the audio signal
observed at pins 1 and
32 of IC001?
Yes
No
From
page evi us