Philips 32PF4320 - dead

[tom66]

Quite an oldie here... only VGA for HD input, no DVI or HDMI. This is the second TV I picked up a couple of days ago.

Fault is set is completely dead no sign of power. No standby power on the PSU.

Opened it up and found that two resistors on the standby supply (one says 2.0 ohms, the other is unreadable) are burned open to 600 ohms. Also, the controller IC shows 500 ohms from Vcc to GND, indicating to me that something has wounded the chip, possibly a shorted FET.

This TV was previously repaired by a TV technician. Clearly the bridge has been replaced - but he never bothered to bolt the new one down to the heatsink!

A new PSU is £14, I hate to give in so easily but it looks like the best way to go.

[vinceroger69]

Re: Philips 32PF4320 - dead

http://www.shopjimmy.com/philips-312...upply-unit.htm
good picture of poweboard when magnifyed up not sure if you can tell colours may help you identify them
edit soz did no see you need the underside pic value as well

[tom66]

Re: Philips 32PF4320 - dead

In this case it's two SMD resistors on the bottom of the board so I can't see the values in the picture, but I'll report the values when I get the new board.

[tom66]

Re: Philips 32PF4320 - dead

New power board in, TV works great. Resistors are 2.7 ohm, by the way. Both are the same. 2.0 ohms was close, probably okay although would affect current limit... or if it was a current-mode power supply maybe change frequency.

[vinceroger69]

Re: Philips 32PF4320 - dead

cool another one saved from the land fill

[tom66]

Re: Philips 32PF4320 - dead

Yep. And another eBay seller not to trust - Just needs a new fuse hah yeah right, a bit more than that. Never trust someone who claims to know what the fault is - or they would have repaired it anyway!