Vizio P50HDM no picture... ysus??

[ryan74]

I found this post, I seem to have the same issue.
https://www.badcaps.net/forum/showth...ghlight=p50hdm

All voltage from power supply board is good. No low glowing light on panel.

-Plug in
10 green led blink then amber
D10-on
D11-flashing
D9 - off

-power on
solid green led
D10-rapid flashing
D11-on
D9 -off

I disconnected ysus - same results
reconnected ysus and disconnected zsus - same results

There seems to be no change when troubleshooting. This makes me think ysus like in link above.

If I am correct in suspecting ysus board what should I look at on the board?
The two fuses are fine.
No scope, just a dmm.
The pic of ysus board is from SJ not actual board.

[tom66]

Re: Vizio P50HDM no picture... ysus??

Check Vs/Va set on PSU correctly.

[ryan74]

Re: Vizio P50HDM no picture... ysus??

This is what I got with ground probe on chassis and testing connection P1(connected from power board) in pic. (fuses are good)
vs- 197.3vdc
va- 59.8vdc

Max vs-200vdc
max va-61vdc

Rated:
vs- 197v
va- 60v

If there are other TP I should check I will need some help.(loc,voltage)

[ryan74]

Re: Vizio P50HDM no picture... ysus??

I missed a fuse on ysus in pic but it tested good and there is 5v. through it.

I'm still not 100% sure it is the ysus. Are there a few TP I can check to confirm?
Is it safe to check vscTP(see pic) with dmm?

-or, is my best option to send it out to be fixed since I dont have a scope?

[ryan74]

Re: Vizio P50HDM no picture... ysus??

I'm still not sure if its a bad ysus or maybe control board. I think I will just try a new ysus.

[ryan74]

Re: Vizio P50HDM no picture... ysus??

This link shows how to test buffer boards for this and similar. Mine were good so no need to order any with ysus.
http://blog.coppelltvrepair.com/2010...-lines-in.html

[tom66]

Re: Vizio P50HDM no picture... ysus??

This method should also be performed.
http://www.youtube.com/watch?v=51SZsfH60EY

[ryan74]

Re: Vizio P50HDM no picture... ysus??

This method should also be performed.
http://www.youtube.com/watch?v=51SZsfH60EY

I can't identify what pin to probe for sustain output(@minute1:50).

pulled a few pics off internet.

[tom66]

Re: Vizio P50HDM no picture... ysus??

Need a closer picture, can't see anything in those.

[ryan74]

Re: Vizio P50HDM no picture... ysus??

these are a bit better.

[ryan74]

Re: Vizio P50HDM no picture... ysus??

while waiting I checked every pin/pad on 1 of the buffers. I got continuity shown in pic. Either the far left or far right pin on all connections had cont..Except the one on the far left end(not shown).

[ryan74]

Re: Vizio P50HDM no picture... ysus??

Update-Nevermind I got my answer to this...Yes

anyone know if this will work?
mine is:
LGE PDP 050303
Model:50X3
P/N:6870QYC004C
6871QYH039A
KP50055J001088
http://www.ebay.com/itm/Vizio-Y-sus-...item3a7ef6dc39

[ryan74]

Re: Vizio P50HDM no picture... ysus??

Update-Nevermind I got my answer to this...Yes

anyone know if this will work?
mine is:
LGE PDP 050303
Model:50X3
P/N:6870QYC004C
6871QYH039A
KP50055J001088
http://www.ebay.com/itm/Vizio-Y-sus-...item3a7ef6dc39

Correction- I don't think this will work, heatsinks are different and red caps are in a different loc.

[tom66]

Re: Vizio P50HDM no picture... ysus??

If all connections are same & board is from same panel it'll likely work.

[ryan74]

Re: Vizio P50HDM no picture... ysus??

ok today is not my day. lol...
my barcode sticker is 6871QYH039A
this replacement is 6871QYH039B
the pic was of wrong board but seems to be correct part.
shopjimmy site says it will work as does the seller.
http://www.shopjimmy.com/lg-6871qyh0...main-board.htm
http://www.ebay.com/itm/Vizio-Y-sus-...item3a7ef6dc39

[ryan74]

Re: Vizio P50HDM no picture... ysus??

I want to retry this but to make sure I do it correct I have to ask if I need to remove all cables/wires from the board when testing(as if I will remove it) or just the main(s) from power supply? There are 2 connections from power supply to ysus.

Tom66 Quote from another post- So, basically, left hand board (from your first pic) is the Y-Sustain, and the right hand board is the Z-Sustain.

* Plug the TV in with no boards disconnected, observe symptoms and keep careful note.

* Unplug TV. Wait approx 1 minute to allow bus voltages to discharge to nearly zero. (Safety.)

* Disconnect Y-Sustain. Plug in TV, observe symptoms and keep careful note.

* Unplug TV. Wait approx 1 minute to allow bus voltages to discharge to nearly zero. (Safety.) Re-connect Y-Sustain.

* Disconnect Z-Sustain. Plug in TV, observe symptoms and keep careful note.
boards disconnected, observe symptoms and keep careful note.

* Unplug TV. Wait approx 1 minute to allow bus voltages to discharge to nearly zero. (Safety.) Connect as normal.

[ryan74]

Re: Vizio P50HDM no picture... ysus??

I got a zsus board to try but do I risk putting it in if ysus is bad?
I think I read somewhere it was ok if voltage from ysus is good. Just don't leave it on if it is not fixed after trying.

I had 2 more vizio 50" plasma offered this week. Not sure if its same models.

[tom66]

Re: Vizio P50HDM no picture... ysus??

On this model, the YSUS only acts as a pass through for the PSU so there should be no risk.

[ryan74]

Re: Vizio P50HDM no picture... ysus??

I got the ysus back and still have sound and no pic.
Ysus and zsus have been replaced.
This sucks...lol
At this time I suspect upper buffer I thought was good. I may just send it in too.
Since I eliminated ysus and zsus being bad I'm stuck.

In post 11 I tested lower buffer.. doh
Probly should try testing upper

Any suggestions?

[ryan74]

Re: Vizio P50HDM no picture... ysus??

I have picture and sound now after putting original zsus back in(got a bad 1 from ebay).
All that was wrong was ysus ipm I had repaired.

Now I have red sparkles very noticable on black picture and picture flickers. VS and VA are good at 197.1v. and 59.7v.
Panel says:
Max vs-200vdc
max va-61vdc

I can try adjusting voltage a little but can someone verify I located the right pots in pic? I read to check voltages or it could be old age. I would like to fix the flickering first.
Any suggestions?