HP PL4260N Service Manual page 68

Failure type
Source: COMP1, COMP2 PC
Description: There is no sound when video/audio signal
input and the volume over the 20 level.
Inspection items
1 Check whether there is sound signal input to correct
source terminal and check signal cable.
2 Check the connections of speaker cable with terminal
on CB.
3 Check that the volume is over the 20 level.
4 Open the back cover.
5 Check the connections of XP601 on TB and XPC91
on CB.
6 Check the connections of XP003 and check whether
+24V power has been supplied to pins of L600/L601
on TB.
7 Check whether the voltage of R604 on TB is +5V.
8 Check whether there is correct sound signal on
correct pin of U67 on MB according to U67
definition.
9 Check whether there is correct sound signal on pin
#34(L)/#35(R)/#20/#21of NP01 on TB.
10 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
#20/#21 of NP01: output of
Remarks
U67 pin definition:
pin #1: left audio input of YPbPr1.
pin #12: right audio input of YPbPr1.
pin #5: left audio input of YPbPr2.
pin #14: right audio input of YPbPr2.
pin #2: left audio input of VGA.
pin #5: right audio input of VGA.
pin #4: left audio input of HDMI.
pin #11: right audio input of HDMI.
pin #16: left audio output.
pin #13: right audio output.