Samsung HP-R4252 42 in plasma. No picture

[Videojoe]

Re: Samsung HP-R4252 42 in plasma. No picture

The upper is measuring 6 Meg ohms to gnd. The lower is measuring 350k to gnd. They were both measuring 300k yesterday.

[Glitcher]

Re: Samsung HP-R4252 42 in plasma. No picture

Do this test.
http://www.youtube.com/watch?v=5hVi5gd0aec

Checking for a shorted IC on the Y buffer

[Videojoe]

Re: Samsung HP-R4252 42 in plasma. No picture

I tested the buffer boards just like the guy in the video and they are fine. I don't understand where the pop and flash came from.

[Videojoe]

Re: Samsung HP-R4252 42 in plasma. No picture

I think I got a bad y main from eBay here. It's buzzing much louder than it should be and when I disconnect it, the rest of the boards seem to be functional.

[newtothis]

Re: Samsung HP-R4252 42 in plasma. No picture

I think I got a bad y main from eBay here. It's buzzing much louder than it should be and when I disconnect it, the rest of the boards seem to be functional.

Return it and get another

[Videojoe]

Re: Samsung HP-R4252 42 in plasma. No picture

He said he was gonna refund my money on Monday, so we'll see. In the meantime, ill be digging mosfets off my old board.

[Videojoe]

Re: Samsung HP-R4252 42 in plasma. No picture

Well he actually refunded my money so I went back to my original y main hd and replaced the fet under the heat sink that was shorted as well as d 5018. All the other diodes seemed ok. Put everything back together, homed out the buffer boards and put them back in. Powered it on and pop, there goes that horrible noise again. Does anyone know what that is? Is this thing ready for the hammer?

[SevillianSTS]

Re: Samsung HP-R4252 42 in plasma. No picture

"Ready for the hammer" LOL, I know the feeling.

[Videojoe]

Re: Samsung HP-R4252 42 in plasma. No picture

Decided to give this dog another look. I replaced the bad MOSFET under the heat sink on the y main and some resistors that didnt look too good. Got it all back together again and it did fire up with good audio but no video at all. The screen is not even glowing. I tweaked all the voltages to match the panel sticker. I've come a long way on this one and I'm so close but I'm not sure what to do next. Anybody with an assist?