Samsung Plasma PN42C450B1D - IGBT keeps shorting

[caphair]

This set originally had two shorted IGBTs on the Y-Sus board.

I ordered some replacements from China and installed. But upon plugging power cord in one of them keeps shorting from collector to emitter and set won't power on just hear a couple relay clicks and goes back into standby.

I confirm it's only the Y-Sus board by unplugging it and set comes on (with no picture)

Bad parts or something else going on?

Here's a pdf I found of the IGBTs
https://www.scribd.com/document/231709293/RJH30E2

[freakaftr8]

Re: Samsung Plasma PN42C450B1D - IGBT keeps shorting

First off. Have you done resistance checks after removing the shorted MOSFETs? D4006 looks blown and I bet your gat e drive IC at U4006 is shortred as well. This will cause your new MOSFETs to not stand a chance

[caphair]

Re: Samsung Plasma PN42C450B1D - IGBT keeps shorting

First off. Have you done resistance checks after removing the shorted MOSFETs? D4006 looks blown and I bet your gat e drive IC at U4006 is shortred as well. This will cause your new MOSFETs to not stand a chance

It's not blown I checked. There's a red paint mark on it that makes it look blown in the pic.

I've done resistance measurements from ground to the collector/emitter pads with the mosfet off and don't get any alarming readings

[diif]

Re: Samsung Plasma PN42C450B1D - IGBT keeps shorting

I had the identical board and bought some RJH30E2 from China. The left one shorted upon applying power. There was another thread on here with the same and suggested they were fakes.
I bought a second lot of RJH30E2, installed and they were fine.

[caphair]

Re: Samsung Plasma PN42C450B1D - IGBT keeps shorting

I had the identical board and bought some RJH30E2 from China. The left one shorted upon applying power. There was another thread on here with the same and suggested they were fakes.
I bought a second lot of RJH30E2, installed and they were fine.

So only one would short everytime? I wonder why only one would short and not the other if they're the same type?

[diif]

Re: Samsung Plasma PN42C450B1D - IGBT keeps shorting

So only one would short everytime? I wonder why only one would short and not the other if they're the same type?

The left one (looking at your photo) definitely failed, the right one might have but I don't remember. I did nothing extra apart from order a second lot, which worked fine.
Perhaps they are factory seconds and not quite up to spec ?

[chrismurphy]

Re: Samsung Plasma PN42C450B1D - IGBT keeps shorting

check the gate drive resistors , if you have an open this will destroy the igbt

[Davi.p]

Re: Samsung Plasma PN42C450B1D - IGBT keeps shorting

have you checked el.caps on the power board especially on vsus?