Repair Flow Chart:Trouble Condition
Green Power LED and LCD backlight is ON, but no video or OSD.
LCD backlight is ON,
but TV has NO VIDEO or OSD.
For Main board:
Is the 12V supplied from “K8B Pin 6/7”?
Replace“Power board” and
“Wire harness”.
Is LVDS signal working?
(see TABLE*1.0)
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”.
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.
No:0V
No:0V or 1.1Vconstant
Yes
Yse:12V
Page 3
(TABLE*1.0)Main board:"LVDS Clock"Test Points
42" Models
LVDS Clock on Main board
P42142-00 Z5GH
P42142M-00 Z5GHM
P42142-02 Z5GK
P42142M-02 Z5GKM
K5LV Pin10 clock+
K5LV Pin8 clock-
Note:The bandwidth of the oscilloscope and probe must be at least 100MHZ or higher to check if the clock pulse exists.
