Philips 42PF7321D/37 Plasma Seeking help and direction

[mirador007]

Hello to all,
I recently joined the forum in hopes that someone can point me in the right direction.

I own a 2006 Philips 42PF7321D/37 plasma which I rarely used, the set was operating fine with absolutely no issues and now the unit do not power on.

I have searched, read and looked into the most common issues with this unit being the capacitors going bad and having to change them.
My issue now that I have removed to back cover to expose all the PCB to exam all the common issues area and found all of the capacitors are perfect(visually) no bulging state.
I also checked for any loose pins/connectors and any other obvious signs like burned out fuse and found none.

I am suspecting at this point that the power supply board is burned out, if so what are my choices at this point?

thank you in advance.

P.S. unlike most common issues related to/with this unit I have had absolutely no issues prior to the unit not turning on at this point. Perfect picture, no blinking lights, audio is perfect. No tardiness on shutting off or on.

[Caleb]

Re: Philips 42PF7321D/37 Plasma Seeking help and direction

A service manual for your set can be found here you can follow the trouble shooting step to locate the failure. The good news is replacement boards for your set are available and are relatively cheap on shop jimmy.

[mirador007]

Re: Philips 42PF7321D/37 Plasma Seeking help and direction

thank you, I have already DL the service manual and I'm getting my hands on a meter to check out the various readings from the transformer and capacitors.
At this point I am suspecting the power supply board given that I had no standby light when the unit stopped working.
I just wanted to make sure this was the issue before ordering the new board.

[Caleb]

Re: Philips 42PF7321D/37 Plasma Seeking help and direction

OK, just be careful when poking around inside a plasma. Plenty of spots on the power board have several hundred volts present including the tops of some heatsinks. Happy hunting

[mirador007]

Re: Philips 42PF7321D/37 Plasma Seeking help and direction

The power supply board has been removed and all the main capacitors have been discharged at this point. I'm just wondering if this is the real issue and not something else according to the service manual.

[Caleb]

Re: Philips 42PF7321D/37 Plasma Seeking help and direction

How did your voltage testing go? Usually if I have no standby power I start by checking all the fuses. If they test good test the bridge, then primary MOSFETs, then onto secondary diodes and MOSFETs. If those test OK start unplugging harnesses to see if I can get the standby to come back. I know this isn't set specific but a lot of the time the basic troubleshooting works.

[Alastair E]

Re: Philips 42PF7321D/37 Plasma Seeking help and direction

Dunno if its the same set/PSU, but worth hunting out and replacing the cap, C2508, 100uF 16V surface-mount electrolytic, this causes the dead symptom many times on Philips Plasmas...

[mirador007]

Re: Philips 42PF7321D/37 Plasma Seeking help and direction

thanks for the input Alastair E. I'm still in the process of checking out the all the Caps for their operating values. I have already located a replacement Power supply board just in case the issue is not related to the caps. There are plenty of refurbished around 45-99 shipped.

[mirador007]

Re: Philips 42PF7321D/37 Plasma Seeking help and direction

Thanks to everyone for their input. I finally got around to testing all the CAPS and found 2 that were visually intact yet out of spec. Both of the replaced caps were well less than half of the uf rating. I was able to find the same value CAPS at Frys elect and replaced them with ease. The Plasma fired up with no issue ( so far ) I am currently going on 2 days with out any issues. The standby works fine, no delay in powering up or down.

Thanks again for the inputs.