Need a little help with a Plasma 42MF230A/37

[jeffescortlx]

This is a magnavox 42" Plasma from 2006.

It had a Buffer chip short on the PBA: LJ92-01203A board.

It's my understanding that the TV should still power up and try to to display (as much as it can with the missing buffer) once the bad buffer is removed.
The TV still will not power up, and the power supply makes some noise like it's being over worked. So I think the shorted buffer damaged the Y-main LJ4-02759A LJ92-01200A.
The Y-main did have a bad R5028, R5090 & D5009, that I replaced but did'nt make a difference.
But I'm thinking maybe the large STK chip under the heat sink is shorted also.

No bad fuses or caps.

Any one have any exsperiance with these?
Thanks for any help!

[tom66]

Re: Need a little help with a Plasma 42MF230A/37

Does the PSU make noises when either Y or Z sustains are disconnected?

[jeffescortlx]

Re: Need a little help with a Plasma 42MF230A/37

There is a short some where on the Y-main. The large draw goes away when the Y-main is disconnected. But the TV wont power on either.

Have you rebuilt the Y-main before? Is it just the large STK chip under the heat sink?

[tom66]

Re: Need a little help with a Plasma 42MF230A/37

Never done it myself thankfully, as it's quite difficult. Usually just the large STK power hybrid shorts on one of the rails... or sometimes all of them. Some people also do repairs on these boards on eBay.