HP PL4260N Service Manual page 64

Failure type
Source: HDMI
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 HDMI
terminal.
3 Open the back cover.
4 Check whether there is correct signal on pin
#3, #4 of U60/U61/U62/U64 on MB.
5 Check whether pin #89 of U11 voltage is
+3.3V.
6 Check that the voltage of FB9, FB10, FB11,
FB12, and FB39 are +3.3V and voltage of
FB40 is +1.8V.
7 Check whether there is correct signal on pin
of R136/R2212/R2213 according to signal
format.
8 Replace the MB if the other steps are correct.
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HP High-Definition Plasma TV Service Manual PL4260N, PL5060N
Picture
R316 and R2212 are on bottom layer of PCB.
pin of R2213: clk
TMDS
Remarks
pin #89 of U11: HDMI reset