tv lcd Philips 42pfl9632d/10 Power board ko

[Bibu]

Re: tv lcd Philips 42pfl9632d/10 Power board ko

I tested the voltage in the connector 1p11 when i ha e black screen and violet led:

8. +12VA= 0v
7. +5V2=5v
6. STANDBY=4v
5. BOOST=0v
4. GND=0v
3. LIGHT OM/OFF =1v
2. POWER GOOD =0v
1. DIM-CONTROL=0v

[CapLeaker]

Re: tv lcd Philips 42pfl9632d/10 Power board ko

Cording to this, your PSU is not turning on.

[Bibu]

Re: tv lcd Philips 42pfl9632d/10 Power board ko

Cording to this, your PSU is not turning on.

And this is clear... But Why?

[CapLeaker]

Re: tv lcd Philips 42pfl9632d/10 Power board ko

I think the STANDBY is the PSon and that has 4V on it. That comes from the main board. I bet, when you try to turn on the TV, you do not get any boosted voltage on the main filter capacitor. No boosted voltage, no 12V, no backlights. If the PFC circuit is working, you should see about 400V DC on the main filter cap. If you only get like 320V DC, the booster (PFC) isn't working. Just be very careful on the primary circuit you are connected to the mains voltage.

[budm]

Re: tv lcd Philips 42pfl9632d/10 Power board ko

That STANDBY pin is the PS-ON but it is ACTIVE LOW, that pin has to be <1V to turn on the power relay on the main power supply board to supply the AC to the main bridge rectifier for the PFC and then main SMPS section. You can look at the diagram on how the STNDBY signal is used.
Right now the signal from the main board is stuck HIGH due to what I do not know, beside not sending the PS-ON it is also not sending the DIM signal either so something really went out this time.

[CapLeaker]

Re: tv lcd Philips 42pfl9632d/10 Power board ko

Didn't see any schematic for this yet. To be fair, I didn't read though all these pages either. Maybe I'll do that in a bit.

So I downloaded the schematic budm, but the first 2 pages are total blurry on my iPad. The last 2 pages are fine as kind. I guess I have to see it on my PC tomorrow.

[Bibu]

Re: tv lcd Philips 42pfl9632d/10 Power board ko

Didn't see any schematic for this yet. To be fair, I didn't read though all these pages either. Maybe I'll do that in a bit.

So I downloaded the schematic budm, but the first 2 pages are total blurry on my iPad. The last 2 pages are fine as kind. I guess I have to see it on my PC tomorrow.

Sto the relay arrive 5v on the two pin, i must look better the ma in board, and search qhy arrive 5 volt in the standby

[CapLeaker]

Re: tv lcd Philips 42pfl9632d/10 Power board ko

So... I have to go after budm saying this is active low PSon. I have to look at that schematic on my PC. For some reason the first 2 pages on the schematic are blurry on my iPad.
I would disconnect everything but the backlights on the power supply, then force the power supply on. Make sure the main board is disconnected. Check the voltage rails.
You reported a 4V on the STBY pin 6. If the PSU is active low, then the main board didn't send any PSon to turn the power supply on.

[Bibu]

Re: tv lcd Philips 42pfl9632d/10 Power board ko

So... I have to go after budm saying this is active low PSon. I have to look at that schematic on my PC. For some reason the first 2 pages on the schematic are blurry on my iPad.
I would disconnect everything but the backlights on the power supply, then force the power supply on. Make sure the main board is disconnected. Check the voltage rails.
You reported a 4V on the STBY pin 6. If the PSU is active low, then the main board didn't send any PSon to turn the power supply on.

With all connected at the two pin it the relay arrive 5v dc,this meaning that the some V is sending by the ssb. The old problem Was that the ssb didn't sent the 5v to the psu (One diode burn), this time is different

For forcing the psu what pin i must jumper?

[budm]

Re: tv lcd Philips 42pfl9632d/10 Power board ko

Have the connector between the main board and the power supply board back in place, then you will ground the STANDBY PIN6 to ground through 100 Ohms resistor.
The problem before was that you did not have the 5V STNADBY to power up the power relay of the main power supply board, but this time you have the standby power supply but some how the main board is not sending the command signal to turn on the power relay.

[Bibu]

Re: tv lcd Philips 42pfl9632d/10 Power board ko

Have the connector between the main board and the power supply board back in place, then you will ground the STANDBY PIN6 to ground through 100 Ohms resistor.
The problem before was that you did not have the 5V STNADBY to power up the power relay of the main power supply board, but this time you have the standby power supply but some how the main board is not sending the command signal to turn on the power relay.

Thanks budm, but id i disconnetto the ma in board, where the psu take the 5v to start the relay?

[budm]

Re: tv lcd Philips 42pfl9632d/10 Power board ko

You will have all the connectors back in place.
Post 130 "Have the connector between the main board and the power supply board back in place"