Philips 19PFL5422D, screen distortion pixelation, fixed with a hack.

[meanderer]

Hi, I just got a Philips 19pfl5422d, made in december 2007, has a refurbishment sticker on the back. the original owner tells me that the screen has artifacts that looks like red pixelation after it turns on for a while. I bought it off him and try my skills/luck.

I took it to my PC output, it shows my desktop no problems. But after a while (5 minutes) it starts to have artifacts, it looks like pixelation. It is "wavy", and the color mostly approximate nearby pixels. I had a dark blueish background, and those pixelation never had any red in it, unlike attached pic (forgot to take a pic on desktop when problem occurs).

I guess the entire power, inverter and CCFLs are fine, and limited my troubleshooting to the graphic logic board and the screen. The LCD should be fine, as it shows a good pic in the beginning. My guess is then the graphic chip heats up and starts to send bad signals to the LCD.

I took out the board. No visible damage on the caps. Some capxons and some I can't read off immediately. The caps I ordered are still not here yet so I guess I won't be replacing any today. I read on the forum that some of these graphic chips can be badly soldered under the BGA package. But I can't do reflow lest breaking the chip. However, I do have a computer chipset heatsink and fan sitting around. Let's give it a shot and test the heat theory.

without proper mounting hardware I resorted to a rubber band and 2 pieces of toothpick. check out the pics I also used some generic white thermal paste between the heatsink. I was thinking of a way to power the fans inside the TV but I am not ready to shock myself to death yet. So I just skip that and test just the heatsink for now. Since I am lazy at the same time I left the fan unconnected in there hehe.

The combined height of the heatsink and fan was pushing on the metal shield when I put it back on very slightly. I was thinking, heck might as well give the chip a little push in case the BGA solder balls are loose

I started testing the thing without a back panel on, no sound.... turns out that the small daughter board must be connected. Or else the board would detect that you have headphone connected and output nothing to the speakers (kinda irrelevent but I want to point out).

I tried every possible input on the TV, HDMI, component, composite, VGA, and now attena. All are working. Also enjoyed beating up my brother repeatedly in street fighter 4

Now I just put it back on and running HDTV show, it's on Letterman right now.... I am going to run it for as long as I can and see if I can get back the pixelation. If not, then I consider it fixed since it's for my personal use.

should I go back and replace the caps? What other things would you experts suggest?

[retiredcaps]

Re: Philips 19PFL5422D, screen distortion pixelation, fixed with a hack.

However, I do have a computer chipset heatsink and fan sitting around. Let's give it a shot and test the heat theory.

I am going to run it for as long as I can and see if I can get back the pixelation. If not, then I consider it fixed since it's for my personal use.

should I go back and replace the caps? What other things would you experts suggest?

A heatsink, while not common, is in the original design of the NEC 1700V that I'm using right now to write this. See my board pic at

https://www.badcaps.net/forum/attach...8&d=1275491514

The one in the middle sits on top of a BGA chip and the top actually screws onto the shield.

If it works, most here will still recommend that you replace the caps to be proactive. If the Capxon caps test good with an ESR, you can reuse them somewhere else.

PS. Great creativity in figuring this out.

[Th3_uN1Qu3]

Re: Philips 19PFL5422D, screen distortion pixelation, fixed with a hack.

Also i'd put on a larger heatsink so to get rid of the whining fan.

[meanderer]

Re: Philips 19PFL5422D, screen distortion pixelation, fixed with a hack.

the TV is 2 days strong, I replaced my old CRT SDTV 20" with this guy. The screen is kinda small to fill up the space the old CRT displaced, I guess I have to get used to it.

no problems at all... there are some hiccups when it comes to the OSD menu. Sometimes it comes out slower, sometimes not at all, depending on which channel I was on. I switched channel and I can go back in OSD menu again. seems like a software issue to me.

cheers!!