HP PL4260N Service Manual page 66

Failure type
Source: ANALOG TV
Description: There is no sound when video/audio
signal input and the volume over the 20 level.
Inspection items
1 Check the connections of speaker cable with
terminal on CB.
2 Check that the volume is over the 20 level.
3 Open the back cover.
4 Check the connections of XP601 on TB and
XPC91 on CB.
5 Check the connections of XP003 on TB, and
whether +24V power has been supplied to pins
of L600/L601 on TB.
6 Check whether the voltage of R604 on TB is
+5V.
7 Check whether there is correct sound signal on
pin #52/#20/#21 NP01 on TB.
8 Check whether there is correct sound signal on
pin #2/#4 of XP601 on TB.
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HP High-Definition Plasma TV Service Manual PL4260N, PL5060N
Picture
Connect speaker and PB terminal.
Remarks
XP003: AMP power
L600/L601: AMP POWER +30V