HP PL4260N - 42" Plasma TV, Service Manual

Page: 59 / 245

HP High-Definition Plasma TV Service Manual PL4260N, PL5060N
53
Failure type Picture
The blue LED is lit and can use remote control, but
there is no OSD and picture on screen. Black screen
When turn on/off power, there is relay coupling sound.
Inspection items Remarks
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 Picture
The amethyst LED is lit, and log hang on screen.
Log: The purple LED is lit.
Description Remarks
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 Picture
Normal operation [source picture]
Description Remarks
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. The “NO SIGNAL” indicator on screen when there is no signal input.
CON20:LVDS connector
#TAB of U57:+3.3V
pin of dispen:
CON7: update connector
pin #2, #3 of
CON47 of update power