Philips 42PFL7422D/37 picture went bad like a switch was flipped

[polarbehr]

Not really sure what to do or what is wrong maybe someone here can help. I was watching it yesterday when the picture all of a sudden washed out. Any help would be great. TIA

[tom66]

Re: Philips 42PFL7422D/37 picture went bad like a switch was flipped

This looks like an AS15-F gamma IC fault, the symptoms are very common. It is fixable but will require good soldering ability or a board repair service/new board. Can you take the back cover off and get us pictures of the parts inside the TV?

[polarbehr]

Re: Philips 42PFL7422D/37 picture went bad like a switch was flipped

dslr or potato camera?

[tom66]

Re: Philips 42PFL7422D/37 picture went bad like a switch was flipped

I'd prefer DSLR if you have one!

[polarbehr]

Re: Philips 42PFL7422D/37 picture went bad like a switch was flipped

Hope this helps

[tom66]

Re: Philips 42PFL7422D/37 picture went bad like a switch was flipped

Ah, this is going to be awkward, but you're going to have to remove that metal plate that everything is mounted to and lift it down a little to expose the T-con board. The T-con board needs to be connected to the main A/V board for the next test (requires a digital multimeter.) The T-con is mounted at the top of the panel, the main A/V is the board with the HDMI and tuner inputs on it.

[budm]

Re: Philips 42PFL7422D/37 picture went bad like a switch was flipped

Looking at the picturs I can see the T-CON has blue color board so it looks like AUTOPTO T-CON which is famous for bad GAMMA IC.
http://www.shopjimmy.com/media/catal...006936-top.jpg

http://www.shopjimmy.com/philips-996...-con-board.htm

[polarbehr]

Re: Philips 42PFL7422D/37 picture went bad like a switch was flipped

Ah, this is going to be awkward, but you're going to have to remove that metal plate that everything is mounted to and lift it down a little to expose the T-con board. The T-con board needs to be connected to the main A/V board for the next test (requires a digital multimeter.) The T-con is mounted at the top of the panel, the main A/V is the board with the HDMI and tuner inputs on it.

OK how hard is it to pull this whole thing apart, and is that for sure the problem you think?

Looking at the picturs I can see the T-CON has blue color board so it looks like AUTOPTO T-CON which is famous for bad GAMMA IC.
http://www.shopjimmy.com/media/catal...006936-top.jpg

http://www.shopjimmy.com/philips-996...-con-board.htm

Around 30 bucks isnt too bad

[tom66]

Re: Philips 42PFL7422D/37 picture went bad like a switch was flipped

I don't know, I've not worked on one of these before. But you will have to find a way to keep the T-con connected for the test. You can replace the T-con outright but there is the possibility of another issue. You can also undo the connections to the inverter boards (green boards, left & right of TV) altough the TV screen will not be lit up any more.

That board is out of stock so unfortunately would be no good, you would have to get the board repaired or replace the chip yourself. You could also buy another board but there is the risk that the chip will fail again shortly afterwards.