Sanyo PLV-55WHD1, Service Manual

Page: 96 / 176

Troubleshooting
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No Picture
No picture with all of
input sources Check signal processing stage and LCD driving stage;
Check RGB S&H signals at test points TPPANELR, TPPANELG, TPPANELB.
Check power supply circuit 15.5V and peripheral circuit.
Check IC501, IC1501, IC2501, IC9401, IC401, IC5500 and peripheral circuits.
Yes
No picture with HDMI
input source
Yes
No
No
Check following steps.
Yes
No
Check HDMI source input stage;
Check IC5500 and peripheral circuits.
Check TMDS data signals "HDMI_*".
No On-Screen-Display
(OSD MENU)
Yes
No
Check OSD processing stage;
Check IC5500 and peripheral circuits.
Check LVDS signals at connector "K8C".
Check test points "TPDE*" around IC5201.
Check test points "TP_O*" around IC9401.
Check signals "R/G/B_OUT_*" around IC401.
Check Digital-TV source input stage;
Check IC6100 and peripheral circuits.
Check IF signals from 20 and 21 pin of A6120.
Check serial data at TPDATA* and TPCLK.
No picture with Digital-
TV input source
No
Yes
No picture with
COMPONENT _2/3
(Y,Pb,Pr) input sources
Check Component source input stage;
Check YCbCr signals. (ex. Y-signal at test point TE6207)
Check IC6200 and peripheral circuits.
No picture with S-VIDEO
input source
No picture with VIDEO
input source
No picture with TV input
source
No
Yes
No
Check AV source input stage;
Check Y/C signals at IC4001, TE5802 and peripheral circuits.
Yes
Check TV source processing stage;
Check composite video signal at TPTV and peripheral circuits.
Yes
Check AV source input stage;
Check composite signal at IC4001, TE5801 and peripheral circuits.