Re: Philips 47PFL3605H/12 Power Supply Not Working (Not Even Standby)

Unfortunately no, but I still have the TV lying around, so if you find out anything it'd be great if you could tell me! I'll do the same of course.

Hey! I was wondering if you found the solution you your phillips tv with the tny that blew. because guess what, I have the exact same problem and the exact same chip blew on me.

Thanks!

Re: Philips 47PFL3605H/12 Power Supply Not Working (Not Even Standby)

Hi everyone,

I'm sorry if I'm being impatient, but just to let you know, I still haven't fixed the issue and am still working on it.
What I did was to disconnect the 5VSB output part from the transformer output (while keeping the control loop intact of course). There is still no 5V output.

I then tried to measure the voltage on the secondary side of T904 (pin 9 - 7) with my oscilloscope and there is actually some output! Every second or so, there are some ~50kHz pulses that...

Re: Philips 47PFL3605H/12 Power Supply Not Working (Not Even Standby)

I measured the voltages from each pin to the source of the TNY IC. The readings are as follows:

Drain - Source: 310V
BP/M - Source: 5.78V
EN/UV - Source: 1.27V

These are all measured with the DMM set to DC mode.

Re: Philips 47PFL3605H/12 Power Supply Not Working (Not Even Standby)

Hi and thank you all for your answers!

I checked the components you mentioned (R962, IC907, D914) and they all seem fine. I didn't take the resistor out of the board but it reads 46.8 Ohm where 47 are needed. The optocoupler I hooked up to a little test circuit and it does its job as well. and the diode, which I also left on the board, opens in the direction it's supposed to, while not letting through any current in reverse.

For now I completely took out the transformer T904, and when...

Hello everyone,

a few days ago, I wanted to turn on my Philips 47PFL3605H/12 TV with the RC and was greeted with a nice and loud bang. So I opened up the TV and found that the IC905 (TNY277PN) had exploded with the drain pin being molten to a little metal blob. First thing I did was to change the part, however, I was not able to fix the problem this way.

There is still no voltage on the secondary side whatsoever. The only voltage I am able to measure so far is 310V DC (Coming from 230V AC in Germany, but should still be 395V???) on the big filter cap (C907), as well as...

Re: New Members - please post your introductions here

Hello everyone, this is Felix from Munich, Germany!

I found this forum looking for information on how to fix my Philips TV's power supply and have yet to come across the right information, but I will certainly keep looking here, so I registered today.

A few words about myself:
I am a mechanical engineering student and usually tinker around with all kinds of things. That includes some old Vespas and motorcycles, but also lots of electronics. Even though I don't have any professional knowledge...