Philips 15pf5120/28

[trashcan10]

I have a 15" Philips that will not turn on. The status led will flash red and green initially and then switch to solid green. The original inverter caps were obviously blown and have been replaced. Overall I have recapped around 50% of the board. I'm thinking maybe it is a fuse somewhere? I will finish the recap next week but I would like some advice on what else to try. Sorry for the lack of back picture, I'll post one when as soon as I can. Any ideas?

[RicB]

Re: Philips 15pf5120/28

is that cap bulging or am i seeing things?

[trashcan10]

Re: Philips 15pf5120/28

That cap and the other one on the inverter was one of the ones that I've replaced. I'll definitely take a look at it again however. I do know the capxon's are usually bad but I'm not sure replacing the remaining capxons will fix the problem although I will try it for sure. Can anyone tell me what the blue cylinders are on the board? Thanks! Edit-With the 330k printed on the top

[PlainBill]

Re: Philips 15pf5120/28

That cap and the other one on the inverter was one of the ones that I've replaced. I'll definitely take a look at it again however. I do know the capxon's are usually bad but I'm not sure replacing the remaining capxons will fix the problem although I will try it for sure. Can anyone tell me what the blue cylinders are on the board? Thanks! Edit-With the 330k printed on the top

First, you are being ambiguous. Was the picture taken before or after the caps were replaced? The cap RicB pointed out is definitely bad, I had assumed that was a 'before' picture.

Second, I did a little research on this TV, and found statements indicating there was a fuse that would blow, causing the flashing LED symptom. The poster did not indicate where the fuse was.

Third, by 'blue cylinders', do you mean the blue-gray cylinders? A better picture would help, I suspect some sort of non-electrolytic cap.

Fourth, what brand and series of caps are you using for replacements?

Last, a little history on the TV, and exactly what you mean by 'will not turn on' would help. Do the backlights come on? Is there sound from the speakers? Does it respond to the remote?

PlainBill

[tmwalsh]

Re: Philips 15pf5120/28

The blue cylinders are just to the left of the tuner box, five of them. If I were making a guess, I'd say they were inductors. You could remove one and look at the symbol silkscreened on the board.
Fuse at the bottom left corner, marked 7A? Right above what looks like a DC input jack. [Assuming this thing is fed DC from an external 'brick' power supply of some sort.
tom

[Wizard]

Re: Philips 15pf5120/28

The 5 blue cylinders are for audio. DC supply filtered by one coil then PWM amplifier for audio through four inductors, extremely efficient that no need for heat sink, the small IC around this four inductors is the PWM audio amp.

The light blue is what they are asking about is the bloated caps on the lamp inverters.

Cheers, Wizard

[bio_haz]

Re: Philips 15pf5120/28

There is a 2.5A surface mount fuse on the inverter, right under were the wires are attached. It's on the bottom of that board, the beige board in the 2nd pic. I had the same model and problem, and that fixed it, I also replaced the caps.

[trashcan10]

Re: Philips 15pf5120/28

Thanks guys, I'm going to try replacing the 2.5 amp fuse on Monday and I'll finish the caps over the weekend. Hopefully this will work. I'll reply back with results as soon as I finish.

[trashcan10]

Re: Philips 15pf5120/28

Well I now have a white screen after recapping everything I had parts for and adding a glass fuse in lieu of the 2.5 amp smd fuse on the inverter. I have replaced all but two or three of the 47 uf 16v caps. I took a few new photos, one front, one back and one of the screen. Everything circled in red has no voltage and the green has 3v on top, 0v left, 3v middle, 4v right. When I turn it on I sometimes hear the speakers crackle. The led alternates between green, red and green and red. Usually staying red while the screen is lit. Any advice?

[PlainBill]

Re: Philips 15pf5120/28

Well I now have a white screen after recapping everything I had parts for and adding a glass fuse in lieu of the 2.5 amp smd fuse on the inverter. I have replaced all but two or three of the 47 uf 16v caps. I took a few new photos, one front, one back and one of the screen. Everything circled in red has no voltage and the green has 3v on top, 0v left, 3v middle, 4v right. When I turn it on I sometimes hear the speakers crackle. The led alternates between green, red and green and red. Usually staying red while the screen is lit. Any advice?

See if you can find a service manual with schematic for that set. There appears to be a single manual which covers the ML1.1U/AA, ML1.1A/AA, and ML1.1E/AA chassis. Many Philips TVs flash the red LED in a pattern to indicate a fault. (1 long flash and 2 shorts flashes means an error 12,etc).

PlainBill

[niceguynatty]

Re: Philips 15pf5120/28

Can someone please send me a link to a website with this fuse(2.5 smf).

[ahickman]

Re: Philips 15pf5120/28

Got one of these from the dump and had the same symptoms. Found that the 2.5 A fuse on the bottom of the inverter was blown. Replaced it with a 3 A SMD. Turned it on and saw a brief flicker of the lamps then off. Power LED cycles through green and red with flickers of the lamps. The two electrolytic caps measure .2 ohms on ESR meter. Suggestions on what to look at next?