HP PL4260N Service Manual page 58

Failure type
The blue LED does not light up, but the red LED can
light up and the log displays on screen.
Inspection items
1 Check whether the +5V power has been
supplied to pin #2 of J21 on MB.
2 Open the rear cover.
3 Check the connections of the J21 on MB and
XPR01 on IB.
4 Check whether the +5V power has been
supplied to pin #5 of XPR01 on IB.
5 Replace the IB if there is power on XPR01,
otherwise, replace the IR cable.
Failure type
Normal operation [OSD 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.
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HP High-Definition Plasma TV Service Manual PL4260N, PL5060N
Picture
pin #2 of J21:+5V
If the blue LED cannot light up, the red LED should light during
power on and initializing.
Picture
Remarks
The "NO SIGNAL" indicator on screen when there is no
signal input.