HP PL4260N has no video

[SurrealMustard]

I'm working on this HP PL4260N 42" Plasma that powers on normally but does not display anything on the screen. Everything has passed my preliminary visual inspection, but the fuse on the left on the Y Sustain board is blown (although the one on the right is still intact).

We are seeing 186 for the Vs voltage and 60 for the Va off the power supply. -Vy on the Y Sustain is holding at around 3.6. I was unable to locate VSCAN (possibly underneath the metal bracket which I have not removed yet) and VZB is a bit in the air; I found a test point called "Vzbias" on the Z sustain, but that does not measure any voltage.

Any ideas as to what to troubleshoot next to figure out what's going on with this?

[SurrealMustard]

Fixed!... but no sound

As suspected, the Y Sustain was indeed the issue. The set fired up right away upon replacement of the board, but all is still not well as I'm not getting any sound out of the speakers (I did not test the sound before the repair). I made sure to plug them in all the way and doublechecked the connections on the mainboards, but I'm still not hearing anything.

Any ideas as to where to look to find out what would be causing a lack of sound?

[SurrealMustard]

multimeter question

After doublechecking the connections, I still have no sound. Can I check audio output with a multimeter going to the speaker connections?

[SurrealMustard]

can't figure it out

This is getting pretty strange. I replaced the sound/tuner board and am still not getting anything. Using a multimeter, the speakers tested good at about 5.7-6.3 both by the connector and where the connectors plug into the board itself, so I don't think it's a connectivity issue. Should I move on to the mainboard or could there be something I'm overlooking?

[SurrealMustard]

All Fixed!

Figured it out! Looks like one of those cables was hiding under the replacement board . Hooking it back up fixed the problem.