Philips 47pfl3603d/27 backlight problem

[Dcourtwreck]

My backlight will shut off. It is just the backlight, if I shine a light near the screen I can still see the image. If I turn the tv off and back on, it will work properly for maybe 30 seconds. The longer the TV is left off, the longer it will work when turned back on.

Did a search, seems like this could be the same issue as mine:
https://www.badcaps.net/forum/showth...7pfl3603d%2F27

Post hadn't been updated in a while, thought it would be better to start a new topic.

The back of the set near the power board (model PLHL-T722A) gets unusually warm, although honestly it wasn't something I would have checked before I had problems. Maybe it was always like that. Also, there is a slight toasty smell coming from the vent over the power board.

I removed the back of the set, and was hoping to see some bulging capacitors (had fixed a different tv previously by replacing them). All the capacitors on the power board look ok. All flat tops except the very large black capacitors in the center of the board. They are black on top, no vents... maybe they aren't capacitors. Are these supposed to be completely flat also? When I look at pictures of the board online, they all seem to have a slight arc to them.

The only spot on the board that looked like potential trouble was on the back of the board. This is near where the backlight(s) plug in. I attached an image, look about an inch to the left of the white peg. Maybe that is just flux? Difficult to tell from the image, sorry for the poor quality.

There was a firmware update that mentions this issue specifically, but it didn't help. It is the actual hardware, not the software.

Any suggestions? I would like to confirm it is the power board before I replace it.

[Dcourtwreck]

Re: Philips 47pfl3603d/27 backlight problem

In case anyone comes across this topic by search, I'll give an update.

I did go ahead and replace the power board. TV seems to be working fine. If that didn't fix it, I could have just re-sold the board on ebay for a slight loss, worth the risk I'd say.

Before I replaced the board, when the TV would function, there was never a brightness issue with the backlight or any pink discoloration, so I just assumed it was something wrong with the inverter part of the power board.

Strangely, with the replacement board, the TV seems less bright now. Not too dark, actually more of what I would expect from an '08 ccfl backlit tv. It makes me wonder if the original board had an over voltage problem, and simply turning down the brightness in the menu would have been a work around. I'm not curious enough to put the old board back in to test, but I'll keep it around in case I ever have to take it apart again