Philips 32PFL6606T 32" LED no back light

[shepp]

Re: Philips 32PFL6606T 32" LED no back light

what resistor should i use? between pin 2-stanby and which other?

[multimeter]

Re: Philips 32PFL6606T 32" LED no back light

somthing just to limit the current a little, a 100k will be ok ,taken onto the 5v rail

[multimeter]

Re: Philips 32PFL6606T 32" LED no back light

sorry taken from the 3.3v rail

[shepp]

Re: Philips 32PFL6606T 32" LED no back light

so from stanby to bl_on?

[multimeter]

Re: Philips 32PFL6606T 32" LED no back light

to turn the power supply on
3.3 to standby
to turn backights on
bl_on to bl_ctrl

[shepp]

Re: Philips 32PFL6606T 32" LED no back light

ok sorry, nothing happened, then i noticed when i switched off some thing arc'd near capacitors

gotta to log off now but ill be back tomoro, if im getting voltage back from the main board but this isnt controlling the back light would this definatly be the power board? is it possible to check the voltage going to the LED's or will this be High Voltage(more than 500v for meter to read)?

[tom66]

Re: Philips 32PFL6606T 32" LED no back light

ok sorry, nothing happened, then i noticed when i switched off some thing arc'd near capacitors

gotta to log off now but ill be back tomoro, if im getting voltage back from the main board but this isnt controlling the back light would this definatly be the power board? is it possible to check the voltage going to the LED's or will this be High Voltage(more than 500v for meter to read)?

I think the LEDs will be in a series string so probably 100-200V total. Be careful, although the output current should only be around 100mA, it can still be very dangerous.

[shepp]

Re: Philips 32PFL6606T 32" LED no back light

Ill let you know what it measures tomorrow, but I got a feeling there will be no voltage, this ones gonna be a real pain to sort out, but I have faith, I will not give up

[tom66]

Re: Philips 32PFL6606T 32" LED no back light

Ill let you know what it measures tomorrow, but I got a feeling there will be no voltage, this ones gonna be a real pain to sort out, but I have faith, I will not give up

I'm sure you can fix it, but if you are ready to give up, PM me before you throw it in the trash, I'll offer you something for it shipped.

There are a few things that can cause this, but you will need to have some basic troubleshooting skills. Testing and eliminating basic subsystems. Anyone can do that...

[shepp]

Re: Philips 32PFL6606T 32" LED no back light

Will the supply for LEDs be a.c.?

[Jasgriff]

Re: Philips 32PFL6606T 32" LED no back light

No they will be DC.

[selldoor]

Re: Philips 32PFL6606T 32" LED no back light

Cant spot if you got the manual but its here

Not a lot about power supply (Its a secret) but a bit in the wiring diags and the troubleshoot might help you.

[shepp]

Re: Philips 32PFL6606T 32" LED no back light

just printing it out at work now thank you selldoor, i wont be home til later but i will post results of dc voltage check going out to the LEDs when i get home

[shepp]

Re: Philips 32PFL6606T 32" LED no back light

right then, voltages are as follows.....
1. A1+ 150V
3. C1 - 123V
5. A2+ 123V
7. C2- 0V
9. A3+ 72V
11. C3- 36V
13. A4+ 36V
15. C4- 0V

THESE ARE TAKEN FROM SWITCHING OFF AND SWITCHING ON AGAIN, BECAUSE THERES A FAULT THEY SWITCH OFF AND THE ERROR CODE 17 IS LOGGED,

im guessing from this there is a problem with the supply for A2-A4? because they are not 150v like A1? the diagrams in service manual help a little but i think the control side is working ok, and there is no diagram for the power supply to the LEDs that i can see

[shepp]

Re: Philips 32PFL6606T 32" LED no back light

basically A1 and A2 are fed in series
and A3 and A4 are the same, so getting there, A3 and A4 is only being fed half the voltage it needs any ideas what might cause this? there is some surface mount stuff, ill upload another pic of the under neath

[shepp]

Re: Philips 32PFL6606T 32" LED no back light

the back,

[shepp]

Re: Philips 32PFL6606T 32" LED no back light

just checked these 2 diodes and they are reading both ways at 0.08v and 1.1v but with them being surface mount im not too sure if i can change them,

the markings on them looks like A6 (D702 and D703) thats if they are diodes,

looks like they control a transistor that powers the primary coil for the LEDs along side another transistor further up the board, if 1 is working and the other isnt could this explain the fault? that the coil is only getting half the voltage to power the LEDs?

[shepp]

Re: Philips 32PFL6606T 32" LED no back light

just checked these 2 diodes and they are reading both ways at 0.08v and 1.1v but with them being surface mount im not too sure if i can change them,

the markings on them looks like A6 (D702 and D703) thats if they are diodes,

looks like they control a transistor that powers the primary coil for the LEDs along side another transistor further up the board, if 1 is working and the other isnt could this explain the fault? that the coil is only getting half the voltage to power the LEDs?

also tested both transistors and they tested the same (good)

help please

[tom66]

Re: Philips 32PFL6606T 32" LED no back light

How easy is it to get to the backlight LEDs?

[shepp]

Re: Philips 32PFL6606T 32" LED no back light

full strip down, but if there is 4 sets of LEDs and only 2 sets are getting the correct 150V surely this means the fault lays on A3 and A4 supply somewhere because there not getting the full 150v there only getting 72v?