HP PL4260N Service Manual page 63

Failure type
Source: PC
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 15 pins
VGA terminal.
3 Open the back cover.
4 Check whether there is correct signal on pin
of R4(R)/R5(G)/R8(B) on MB.
5 Check pin #14 of U2 is +5V.
6 Check whether there is correct signal on pin
#4(HS)/#8(VS) of U2 on MB.
7 Check whether there is correct signal on close
U9 pin of C90(R), C2(G), C87(B) on MB.
8 Replace the MB if the other steps are correct.
Picture
This IC process the HS/VS signal
Remarks
HP High-Definition Plasma TV Service Manual PL4260N, PL5060N
57