CurtPalme.com Home Theater Forum

[Rdean]

I am helping someone nearby with an issue with his 9500. No high voltage crackle.

I have done the following:

Swapped in known good HVPS

Swapped in known good LVPS

Swapped in known good HDM

Swapped in known good VIM

Pulled Focus module (not needed to power up right?) and tried with known good FM as well

Swapped in known good CLM. None of the error indicator lights are lit


The only board I did not swap in was verticle board.

What else is left? Could a bad verticle board prohibit HV without a verticle deflection error LED showing on the CLM?

Thanks,
Randy

[dvh99]

the vdm could prevent the hv to come up if bad, but you would get a error led on the clm in most cases i think.

you can also unplug the conv board by unplugging the ribbon cable this will automatically disable the astig board.

a faulty vim could prevent the pj from firing up so try reseating or exchanging the vim too.

run the pj with just the green plugged in the hv splitter.

if all fails it might even be a bad backplane, but i would rule that out till last.

[Nashou66]

Could either be the VDM or one of the VNB's. The PJ will fire up with one VNB not connected for a short time. Unplug one black umbilical cord off the mother board at a time and try to fire up.

Also check the connection on the VDM ribbon cable to make sure it is seated well.

Also keep the focus module in. it might not want to start HV without it, not sure. But i am sure its not the cause if its failed, it would just be out of focus.

Athanasios

[Curt Palme]

Is this the set where I repaired the HDM and tested the HVPS recently? As Nash says, pull the neck boards off the tubes one at a time and disconnect them completely from the set. The other two tubes should fire up if one bad neck board is cisconnected.

If not, the HVPS connector under the red tube could be oxidized, the backplane or motherboard could be bad (I've had one smoke a trace before), but you've got a non standard problem there if it's not the neck boards..

[Curt Palme]

Is this the set where I repaired the HDM and tested the HVPS recently? As Nash says, pull the neck boards off the tubes one at a time and disconnect them completely from the set. The other two tubes should fire up if one bad neck board is cisconnected.

If not, the HVPS connector under the red tube could be oxidized, the backplane or motherboard could be bad (I've had one smoke a trace before), but you've got a non standard problem there if it's not the neck boards..

[Rdean]

Thanks for the tips. I don't think the owner has sent his HVPS supply in to you Curt but I could be mistaken. I definitely plan to have him get in touch with you for whatever part is found to be bad. I want to keep my spares anyway.

I edited the OP with more details that I had left out about the swapped VIM and FM inclusion.

It's been over a year since I first did some of the initial troubleshooting. I think I removed each neck card and replaced with what I thought to be a good one. I don't think I tried having only one connected at a time though.

So from what I can deduce from the suggestions this is what I will do in order:

1. Remove ribbon to convergence board to rule out convergence and astig boards

2. Check VDM ribbon cable connection

3. Swap in known good VDM (hopefully this will not require removing the entire heat sink from the dead Marquee)

4. One by one have only one neck card connected with ribbon cable to the motherboard (So the black ribbon cable is the only cable that needs to be removed from neck card to accomplish this test? Or do I need to physically remove the other two cards?)



Where would I look for oxidation? At the HV splitter connector?

[Nashou66]

[scottatl]

Curt, that was me that sent it to you. Looks like I am chasing the same issue. At the speed I work my money is on the OP to fix it first