Phillips 50pfp5332d/37--BlownUP Buffer Chip!! NO PICTURE ON SCREEN!

[tw2005]

Re: Phillips 50pfp5332d/37--BlownUP Buffer Chip!! NO PICTURE ON SCREEN!

Acetone based with water is the only thing on the bottle. There might be a better method posted on the internet somewhere. It's either made me soft in the head, or the 'glue' soft enough to get a fingernail to lift the stuff off.

They do repair these boards at repair services listed. I'm willing to bet a fiver they won't give up that knowledge easy if asked. So I'm experimenting.

S-

There's nothing like that here, board swappers, market too small, everyone would rather get a new TV compared to the crazy quotes. I do(did) it for fun and did make a few bucks for a while but now, you'd struggle to get good money unless it was a smart tv and not plasma.

[Tedybear]

Re: Phillips 50pfp5332d/37--BlownUP Buffer Chip!! NO PICTURE ON SCREEN!

Oddly enough that's why I started messing around with it again. I hate to see stuff hit the landfill for silly reasons. We use craigslist to locate the repairable ones and offer a few bucks to the owners. And I tell 'em upfront that if I can repair the set, I'll likely resell for cost + a percentage for my time. Most are pretty cool with it.

Other posters advertise "Free Recycling of your broken flat panel TV" and they repair them and resell them in pawn shops, or harvest working board parts for other sets or flip the boards on eBay. (that's what they do with broken screen sets)

Yeah it's kinda what I do...except I'll offer a few bucks for it. And be upfront about my intentions. They do it to max out any profit made. Is it legal? Yes. Ethical? Questionable... (I've lost out on about a dozen or so 32" sets...I think these guys must have smart phone ap's that scour Craigslist for sets.... I missed one by 15 minutes..and it was posted 25 minutes prior...)

Ah well. This one is my learning curve. I did already learn my soldering iron may be a high end type by Weller. But it's a pain with mosfets. Heats up the solder at the top of the joint so the solder sucker does it's job. But on that Y-Board the thickness of the board and the copper insert used? The copper soaks up the heat--toasts the board hole slightly, and when you go to remove the mosfet?-- I've had two of the copper inserts come out with it. The electrical connections are still made thankfully. But it taught me a lot about how to remove these buggers.

I'm kinda hopeful that when I upgrade my soldering station I can afford a hot air type rework one, and a 60watt+ adjustable iron. That should help save the board inserts, and make things a lot faster. (For those kids reading this thinking a Radio Shack iron is just "great"? That's my large wattage iron. It sucks. Heats up the part quickly, but the tip drops it's heat to fast when applied to a lug/terminal. By the time you get the solder sucker in your other hand--The iron already gave it up and the solder is hard again..)

S-

[Tedybear]

Re: Phillips 50pfp5332d/37--BlownUP Buffer Chip!! NO PICTURE ON SCREEN!

Well. Pretty sad news.

I had to call the family to surround the patient.

Replacement of the blown mosfet went well.

Powered the set up hopeful for a pulse.

And it promptly fried yet another buffer chip in a different location on the board.

I only purchased two of them, one for a spare in case I nackered it during the install.

I'm going to part out the set on eBay. I know the power supply board is in mint shape. (full recap and new voltage regulators) So it's just going to attempt to recoup the expenses I have into it.

Sometimes you just have to know when to call it. It was a great learning time with the plasma sets--but I think I'll stick with the LCD sets. I seem to have a knack with those and the DLP sets.

I wanted to thank everyone for their advice and aid with this one.

S-

[Tedybear]

Re: Phillips 50pfp5332d/37--BlownUP Buffer Chip!! NO PICTURE ON SCREEN!

side bar note: When I do sell things on eBay like this? I always do full description and let people know what the score is. And I won't sell that Y-Board or the buffer boards due to them being probably still hosed.

[freakaftr8]

Re: Phillips 50pfp5332d/37--BlownUP Buffer Chip!! NO PICTURE ON SCREEN!

Your problem was a buffer chip blew our in series and probably threatened another. Sometimes I run an ohm meter down the legs and check for inconsistent readings off the other buffer pins. Can you check voltages without the buffer board in place?

[Tedybear]

Re: Phillips 50pfp5332d/37--BlownUP Buffer Chip!! NO PICTURE ON SCREEN!

It's no longer worth it for me to continue on with this. It took 2 weeks to get the mosfets in (had to order in from china) and the buffer chips. I only ordered in 2 of the buffers, so if I replace them--and another blows?

Sometimes you have to know when to call it a day. I'm already into this by about a hundred, and while the intent was to resell at first-it's already at the max that I would invest to repair to resell. And I can't really in good faith sell this as a 'repaired' set knowing how weak that Y board and buffer boards where designed. Serious--why couldn't the designers spend the extra 5 bucks for a flippen' cooling fan?

So I know the power supply board is in good shape, recapped and the regulators. That once sold should recoup the lions share of the expenses. I'm just going to call this a learning project and call it a day.

S-