Philips 32PFL4508/F7 won't turn on. No power or screen leds.

[htko89]

Hello everyone,

I have a Philips TV gifted by a friend that won't turn on (no standby LED, or screen LED), hopefully someone has the same issue or can help me with this
It previously worked (for about an hour) and then when I turned it on the next day, it was completely dead.

Pictures & Info:



Model: 32PFL4508/F7 S/N: ME2A1402120028
Power Supply: BA31M0F0102 4
Front Back
Digital A/V board: BA31MOG0201 2
Front
I found a service manual for the model, but it is for a previous S/N iteration (starting with ME1 instead of ME2) :
Service Manual link

Power Supply Board ( BA31M0F0102 4 ) :

I assumed they are similar so I started to use the schematics diagram on page 34 (power supply) to measure the voltages on the power board:



Reference voltages on the very left. Note the voltages at CN1001 and pins 19 and 17 on CN501. possibly because the LCD is off at this point. None of the touch controls in the front work, nor does the remote, or is there any sort of indication of standby or power on. Which leads me to think that the power board isn't the issue here? or is it?

I checked the diodes and main fuse on the power board and they seem fine. The caps look fine too. All of this measuring was done with the flex cables plugged in.

[htko89]

Re: Philips 32PFL4508/F7 won't turn on. No power or screen leds.

Digital A/V board ( BA31MOG0201 2 ):

I did some additional checking of voltages of the two flex cables coming out from the Digital Mains board, following the schematic on page 35 (function board, for the controls), and page 36 (digital board)



I would think LCD is not receiving power because the unit isn't turning on. Note: Pin 4 on the function board is strange though.. At this point I'm completely confused at what to do next. Is it the power supply, or digital AV board, or controls / function board, or the LED / LCD.. any suggestions?

[Diah]

Re: Philips 32PFL4508/F7 won't turn on. No power or screen leds.

its look the fault at CBA unit, and as you wrote it was working and next day wont turn on, i would suggest try with your finger pressing on CBA to check if there crack soldering on it.

[htko89]

Re: Philips 32PFL4508/F7 won't turn on. No power or screen leds.

its look the fault at CBA unit, and as you wrote it was working and next day wont turn on, i would suggest try with your finger pressing on CBA to check if there crack soldering on it.

Thanks for the reply. by CBA do you mean the front control panel board thing? I'm sorry i just don't know the terminology

EDIT: I took it apart hmm

[Diah]

Re: Philips 32PFL4508/F7 won't turn on. No power or screen leds.

this model the main board ( Digital main board ) called CBA

[ReeceyBurger123]

Re: Philips 32PFL4508/F7 won't turn on. No power or screen leds.

Bga he means.

[htko89]

Re: Philips 32PFL4508/F7 won't turn on. No power or screen leds.

oohh okay I'll take a look. would I feel something if its cracked? I didn't want to press too hard

[Diah]

Re: Philips 32PFL4508/F7 won't turn on. No power or screen leds.

its not human bone to hear knack .. just remark the function of the tv

[htko89]

Re: Philips 32PFL4508/F7 won't turn on. No power or screen leds.

well so far, I don't notice any cracked solder joints. I suppose I'll keep checking.

I just wish I knew how to pinpoint where the problem is.

[Diah]

Re: Philips 32PFL4508/F7 won't turn on. No power or screen leds.

by push pressure check, push the main processor and keep on while you turn on,
if nothings, try to freeze the memory chips or re solder its pins, it had only 4 pins out
main board trouble shooting very complex, thought Philips technic self don't do it , they just replace boards

[htko89]

Re: Philips 32PFL4508/F7 won't turn on. No power or screen leds.

Yeahh, I can see why.. I think for the next few days I'm going to poke around a bit more before I buy the board in total. I definitely appreciate the help though. If anyone has any suggestions or requests for info, please don't hesitate! Your suggestion might save me from buying a board outright

[vinceroger69]

Re: Philips 32PFL4508/F7 won't turn on. No power or screen leds.

this does seem a good price if its the correct board
http://www.ebay.com/itm/PHILIPS-32PF...YAAOSwq19XB1f-

[htko89]

Re: Philips 32PFL4508/F7 won't turn on. No power or screen leds.

this does seem a good price if its the correct board
http://www.ebay.com/itm/PHILIPS-32PF...YAAOSwq19XB1f-

oh my. That is actually a really really good price, and its located in the same country too so there is no import tax. Just ordered, thank you for the amazing find!! Most boards I found were 60$ CAD+