HP PL4260N Service Manual page 61

Failure type
Source: ANALOG TV
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 RF
terminal.
3 Open the back cover.
4 Check power connector XP004 and pin
#TAB/N801=+5V,#TAB/N802=+2.5V,
#TAB/N803=+3.3V, #TAB/N804=+1.2V,
#TAB/N805=+9V, #TAB/N806=+5V.
5 Check whether there is correct signal on pin
#13(Y)/14(C) of NH01 on TB.
6 Check whether there is correct signal on pin
#33(Y)/31(C) of CON28 on MB.
7 Check whether there is correct signal on close
U9 pin of C88(Y)/C91(C) on MB.
8 Replace the MB if the other steps are correct.
Picture
CON28: connector of MB and
Remarks
Power supply LDO and connector.
HP High-Definition Plasma TV Service Manual PL4260N, PL5060N
55