PHILIPS 37PFL8404h/12 power issues.

[crazykill]

Hello everyone i recently found a cheap broken Philips 37inch lcd tv.I have decided to try repairing it.I have tried the flashlight method.The tv turns on with no picture and red light for less then a second followed by 18 white led flashes.So far i have checked the ouputs on the power board everything is in the range but the INV-OK pin is 0V.Any suggestions will be appreciated
Good day to all.

[dick_barton]

Re: PHILIPS 37PFL8404h/12 power issues.

Post some clear photo's as attachments and also of the legends printed alongside or nearby giving the voltages of each pin of the connectors will be a good starting point for people to assist you.

[crazykill]

Re: PHILIPS 37PFL8404h/12 power issues.

My bad i should have started with that.

Quick note PS-On pin jumps to 3.3V when the power button is pushed all other pins remain the same.

[dick_barton]

Re: PHILIPS 37PFL8404h/12 power issues.

Maybe worth having a quick look
Looks like the set suffers from burning up the high voltage caps on the inverter outputs

http://www.lcdtvrepair.us/faults/Phi...L8404H_12--929

http://www.hifi-forum.de/viewthread-152-9820.html

https://www.youtube.com/watch?v=CEKwZ8p3mxs

[crazykill]

Re: PHILIPS 37PFL8404h/12 power issues.

Thanks i will take a look.But even if the inverter is not working the set should at least power on normally right ?

[dick_barton]

Re: PHILIPS 37PFL8404h/12 power issues.

Only if it does not return an inverter fault signal if there is one, back to the main board.
You said INV_OK = 0 so that could be the inverter fault signal.

[crazykill]

Re: PHILIPS 37PFL8404h/12 power issues.

So i checked the caps there are two pairs consisting of 33J and 47j both 6Kv on one of the pairs the 33J one is fried i will replace it and report back.Thanks again for the help.

[dick_barton]

Re: PHILIPS 37PFL8404h/12 power issues.

So i checked the caps there are two pairs consisting of 33J and 47j both 6Kv on one of the pairs the 33J one is fried i will replace it and report back.Thanks again for the help.

They apppear to be a weakness in this set so I would change all four of them rather than finding out that the others are about to fail.

[crazykill]

Re: PHILIPS 37PFL8404h/12 power issues.

Yea figured that out.I ordered 4 of every type just to be safe.

[Th3_uN1Qu3]

Re: PHILIPS 37PFL8404h/12 power issues.

Anyone got a service manual for this TV? I am trying to find the part number of the mainboard to Tcon cable - it's missing on this set i have here.

[vinceroger69]

Re: PHILIPS 37PFL8404h/12 power issues.

Anyone got a service manual for this TV? I am trying to find the part number of the mainboard to Tcon cable - it's missing on this set i have here.

not sure what chassis number is used in your set but maybe this

[Th3_uN1Qu3]

Re: PHILIPS 37PFL8404h/12 power issues.

Thank you, the manual is right but it didn't help with the part number. I was able to find it though, it's these two cables here: http://www.harryelectronics.com/cabl...3139-171-04941

Now i have asked the guy who has the power supply for sale here, maybe he has the cables as well so i can get a combo deal. I suspect there is a good reason why these parts were taken out of this particular set, it could have a CCFL (fixable) or panel (unfixable) failure so in case it is a bad panel, i am trying to get them as cheap as i possibly can.