Sanyo DP42142 Service Manual page 5

Repair Flow Chart:Trouble Condition
Green Power LED and LCD backlight is ON, but no video or OSD.
Is the 12V supplied from "K8B Pin 6/7"?
Confirm LVDS cable connection
and then check video or OSD again.
T-Con Board or LCD panel can not work.
1st:Replace"T-Con Board&LVDS Cable".
If T-Con board&LVDS cable has no
problem, then 2nd:Replace"LCD Panel".
(TABLE*1.0)Main board:"LVDS Clock"Test Points
42" Models
P42142-00 Z5GH
P42142M-00 Z5GHM
P42142-02 Z5GK
P42142M-02 Z5GKM
Note:The bandwidth of the oscilloscope and probe must be at least 100MHZ or higher to check if the clock pulse exists.
LCD backlight is ON,
but TV has NO VIDEO or OSD.
For Main board:
Yse:12V
Is LVDS signal working?
(see TABLE*1.0)
Yes
LVDS Clock on Main board
K5LV Pin10 clock+
K5LV Pin8 clock-
No:0V
Replace"Power board" and
"Wire harness".
No:0V or 1.1Vconstant
Main board can not work.
Replace "Main board".
If LVDS signal output is OK, the Main board is
normally OK, but can not be sure. If
the T-Con Board & LVDS has no problem,
please try the Main Board before changing
the panel.
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