HP PL4260N Service Manual page 59

Failure type
The blue LED is lit and can use remote control, but
there is no OSD and picture on screen.
Inspection items
1
Open the back cover.
2
Check the LVDS connections of CON20 on MB
and P3 on LB.
3
Check whether the +3.3V power has been
supplied to pin #TAB of U57 on MB.
4
Check whether the +3.3V power has been
supplied to pin #13(dispen) of U30 on MB.
5
Replace the MB.
Failure type
The amethyst LED is lit, and log hang on screen.
Description
1
Open the back cover.
2
Update the new software and try again.
3
Check whether the pin #2, #3 of CON16 is 3.3V.
4
Replace the TB and try again.
5
Replace the MB.
Item
Normal operation [source picture]
Description
There is picture or OSD on screen when TV is normal
and the blue LED is lit. And OSD will display on
screen when press the Menu button on remote control
or Menu key on the left of set.
Picture
Black screen
When turn on/off power, there is relay coupling sound.
Remarks
CON20:LVDS connector
#TAB of U57:+3.3V
pin of dispen:
Picture
Log: The purple LED is lit.
Remarks
CON7: update connector
pin #2, #3 of
CON47 of update power
Picture
Remarks
The "NO SIGNAL" indicator on screen when there is no signal input.
HP High-Definition Plasma TV Service Manual PL4260N, PL5060N
53