Philips 42pf9966 Y-sustain

[dan1983]

Hey guys,

Recently acquired a 42pf9966 for free not working, teardown and research showed an upper Y buffer with 4 out of 6 chips literally blown out. Lower board is physically ok looking. I ordered both, will be here tomorrow.

My concern is, should I replace the sustain main board as well? I'm afraid if I plug these in, and the y main is faulty, I will blow up brand new buffer boards. Is this a valid concern? Or will a short power-on be ok just to test it?

Or is there a better way to test my Y main board?

Thanks,
Dan

[dan1983]

Re: Philips 42pf9966 Y-sustain

Well I just installed my newly arrived buffer boards. Gonna reassemble the tv after i run a few errands. Since it seems the people who know about this stuff are not available at the moment, I guess i am just gonna power it on and hope for the best....

[dan1983]

Re: Philips 42pf9966 Y-sustain

Update:

Installed the buffers, screen shows more lines and stuff than before, but still not working.

I uploaded 2 pictures, not sure if it worked

Edit: the screen shows this when I attempt to control the menu. Otherwise, it doesn't show anything. But I don't have a source hooked up either.

[tom66]

Re: Philips 42pf9966 Y-sustain

It definitely looks like the buffer boards are no good, these are new ones? Did the seller test them?
Need picture of Y-main to confirm diagnosis by checking Vsch.
Also check all cables between buffer and Y-main, and Y-main and logic board fully connected.

[dan1983]

Re: Philips 42pf9966 Y-sustain

It definitely looks like the buffer boards are no good, these are new ones? Did the seller test them?
Need picture of Y-main to confirm diagnosis by checking Vsch.
Also check all cables between buffer and Y-main, and Y-main and logic board fully connected.

Yes, new buffer boards, bought from shopjimmy.com. they came with an inspection sheet saying they were tested and all that. Attached is a picture of the Y-Sus in my TV. Not mine, just an ebay picture. (Which I had to Screenshot because it was a weird format...) I have to run out for a while and will disassemble my TV again later, and provide a pic of my actual boards.

I will also check those voltages you told me to. I'll figure out how to hook everything up with it disassembled. I've been inside a lot of electronic devices in my 30 years, but this one is, by far, the most complicated yet,,,

[tom66]

Re: Philips 42pf9966 Y-sustain

I'm afraid I can't see any useful detail in that image, is there no way you can get a clear photo of your board?

[dan1983]

Re: Philips 42pf9966 Y-sustain

I'm afraid I can't see any useful detail in that image, is there no way you can get a clear photo of your board?

I'll try later. Sorry, but I have to run out for a few hours. When I get home, I'll pull my board and try to get a good shot of it. I guess we'll resume tomorrow, I won't be home til 9-10, which for you is, 1-2 am, and I'm sure you won't still be up then, haha, I know I won't be. Thanks for your help so far. I'd *really* like to retire my 36" RCA CRT in the worst way lol