HP PL4260N Service Manual page 71

Failure type
Cannot use power switch key to turn on/off TV.
And other key is OK.
Inspection items
1 Open the back cover.
2 Check whether there is +3.3V power has
been supplied to pin #4 of J21 on MB when
the key isn't being pressed.
3 Check whether the voltage of pin #4 of J21 is
0V when the key is pressed.
4 Check the connections of the J23 on MB and
XPR01 on IB.
5 Replace the KB.
Failure type
Cannot use any key on the left side of TV. And
the power switch key is OK.
Inspection items
1 Open the back cover.
2 Check the connections of J23 on MB and
XPK01 on KB.
3 Replace the IB.
Picture
pin #4 of
Remarks
Picture
J23: key connector
Remarks
HP High-Definition Plasma TV Service Manual PL4260N, PL5060N
65