HP PL4260N Service Manual page 62

Failure type
Source: COMP1, COMP2
Description: NO SIGNAL/Menu display only, and no
video picture, other source is OK.
Inspection items
1 Change P. Mode to Standard Mode and
check signal cable.
2 Check whether there is signal input to
correctly component terminal.
3 Open the back cover.
4 Check whether there is correct signal on pin
#2(Y1)/3(Y2), #5(Pb1)/6(Pb2),
#11(Pr1)/10(Pr2) of U702 on MB.
5 Check whether there is correct signal on pin
#4(Y), #7(Pb), #9(Pr) of U702 on MB.
6 Check whether there is correct signal on close
U9 pin of C81(Y), C88(Pb), C89(Pr) on MB.
7 Replace the MB if the other steps are correct.
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HP High-Definition Plasma TV Service Manual PL4260N, PL5060N
Picture
Please check whether pin#16 of U702 is +5V first.
U702: component signal
Remarks
C88 and C89 are on bottom layer of MB.
C81: component Y signal into