Vizio P42HDTV10A With LG 6871QYH053B Y-SUS

[johnboy1313]

I've got a Vizio Plasma with LG internals on my bench right now. It has the PDP42X3 plasma panel in it. I think I have narrowed the problem down to the Y-SUS board. There is one fuse blown on the Y-SUS and the pins on the IC are shorted to ground. My IC is not exactly the same which is why I say I think the Y-SUS is bad.

http://blog.coppelltvrepair.com/2011...s-ipm-for.html

I have an 42" AKAI something or other with the same panel and the same 6871QYH053B Y-SUS board in the basement that has the input menu flashing on and off repeatedly. I know that the Y-SUS in the AKAI is good and the pins don't show to be shorted using the above test.

Here's my dilemma. If the panel in the Vizio is bad, would it have caused the bad Y-SUS to fry? Will it fry my known good Y-SUS? I only paid $40 for the AKAI and really had no plans for it, but I don't want to fry good boards for no reason. Also, should I swap out the Y-SUS and buffer or just the Y-SUS?

Care to offer any input?

[tom66]

Re: Vizio P42HDTV10A With LG 6871QYH053B Y-SUS

Both your Y-sus are bad, I expect. Flashing screen is bad ERC on Y-sus. Not aware of any LG panel failures that kill the Y-sus (really only certain Panasonic TVs have the issue and they only kill the buffers) but the bad Y-sus can kill the buffer boards too.

[johnboy1313]

Re: Vizio P42HDTV10A With LG 6871QYH053B Y-SUS

It's not a flashing screen. The input menu flashes on and off repeatedly. The rest of the screen is solid blue (except for a few red lines).

https://www.youtube.com/watch?v=Ai0Syup4438

So if the Y-SUS is bad in the AKAI as well, it should transfer the fault to the Vizio unit, correct? I guess I will try it and report back. Thanks Tom.

[tom66]

Re: Vizio P42HDTV10A With LG 6871QYH053B Y-SUS

Oh OK. That looks fine then for a Y-sus. Transfer the buffers too. It may be difficult but it will stop the Y-sus from frying.

[johnboy1313]

Re: Vizio P42HDTV10A With LG 6871QYH053B Y-SUS

Oh OK. That looks fine then for a Y-sus. Transfer the buffers too. It may be difficult but it will stop the Y-sus from frying.

I probably should have looked for your response before I swapped the new Y-SUS in without the buffers. I already had both Y-SUS's out on the bench. I swapped the new one in. The set works. Va and Vs are a little low though. I'll have to find the test points for Vset, Vscan, and Ve.

I just spoke with the owner. I told him that if it were me, I wouldn't put a dime into a 7 year old TV. I could get it working today and tomorrow something else might go out on it. I quoted him a fair price, $150, for the Y-SUS and the buffer board installed and out the door. He asked how much for just the Y-SUS installed. I told him $100. He says he just wants the Y-SUS. I told him again that if it were my TV, I wouldn't do it. I also told him that there would be no warranty. He told me he had to think about it and that he'd call me back when he got off work.

At this point, I may just tell him, "Here's the part you need, here's how to put it in. Order it yourself and save some money."

This is my last "for hire" gig.

[tom66]

Re: Vizio P42HDTV10A With LG 6871QYH053B Y-SUS

I have since stopped offering to do repairs for others since the LG 50" 50PC1D had a bad Y-sus, buffers and to top it off, bad caps on the PSU. Not worth it...