Olevia 242-T11 No Picture no Sound No back lights

[budm]

Re: Olevia 242-T11 No Picture no Sound No back lights

http://www.fspgroupusa.com/fsp2714f02/p/764.html
You have to have>3vdc at cns1 pin2 (ps_on) to turn on the 18/25v power supply section.

[Chuda33]

Re: Olevia 242-T11 No Picture no Sound No back lights

What do you think is causing that the TV can be turned OFF after it was turned ON?

[budm]

Re: Olevia 242-T11 No Picture no Sound No back lights

I do not know. If the PS_ON goes away then th emain board is the problem, but to narrow it down to component lvel, you will need the schematic to trace that down. You are getting the PS_ON >3V right?

[Chuda33]

Re: Olevia 242-T11 No Picture no Sound No back lights

Here is the reading I am getting on PS_ON:
1.8147 V. Could this be the problem?

[budm]

Re: Olevia 242-T11 No Picture no Sound No back lights

That is on the low side. So right now the TV will not come on with PS_ON of 1.8147?

[Chuda33]

Re: Olevia 242-T11 No Picture no Sound No back lights

so, do you think that is definitely the main board or what?

[budm]

Re: Olevia 242-T11 No Picture no Sound No back lights

My question is, does the TV come on with PS_ON at 1.8147V? You can verify the power supply function by removing the PS_ON pin wire from the socket first so it will back feed the force on voltage back to the main board, then feed that PS_ON pin on the power supply board using 1K resistor between the PS_ON pin and the 5V standby. That should make the 18v/24v power supply to start up.

[Chuda33]

Re: Olevia 242-T11 No Picture no Sound No back lights

Hey guys,
Do you know where I can get Replacement board for this TV. Everyone seems to be out of stock?

[Chuda33]

Re: Olevia 242-T11 No Picture no Sound No back lights

Budm, I am sorry, Can you explain that again, because I am having trouble understanding?

Thanks

[Chuda33]

Re: Olevia 242-T11 No Picture no Sound No back lights

From which side of the socket should I remove the wire firs. From the PSU or the Main Board?

[budm]

Re: Olevia 242-T11 No Picture no Sound No back lights

Either side will be fine.

[Chuda33]

Re: Olevia 242-T11 No Picture no Sound No back lights

With the wire removed from the socket and the 1K resistor connected to the PS_ON pin I read 3.2634 volts. once I connect the wire in the socket again, I get 1.8147 again. What does that mean? can you also tell me how much voltage should be going to the T CON board? Sorry that I am asking so many questions, but I am really new at this.

Thanks

[budm]

Re: Olevia 242-T11 No Picture no Sound No back lights

OK, you will have to leave the wire not connected for now and the leave the resistor in place, then hit the power button on the TV, the backlights should come on unless the BL_ON (backlights on) from the main board is also bad.
The voltage for the T-CON can be either 5V or 12V depends on the model number of the LCD panel.
Right now we are trying to find if it may just have one problem with the PS_ON Control signal only or more problem than that.

[Chuda33]

Re: Olevia 242-T11 No Picture no Sound No back lights

I have done that and the problem remains. The back lights do not turn on just with the resistor in Place, however, by using a different wire and feeding 5 volts to the Blue wire, the light do come on.

[Chuda33]

Re: Olevia 242-T11 No Picture no Sound No back lights

Is there a way to get the schematics of both of these boards?
I think that way we would be able to better trace the problem.

Thanks.

[budm]

Re: Olevia 242-T11 No Picture no Sound No back lights

That means the main board is bad for sure, it is not sending out either PS_ON or BL_ON.
Your power supply board is OK. Just have to keep looking for the service manual to troubleshoot the main board down to component level, the company is no longer in business. So is it really worth it?

[Chuda33]

Re: Olevia 242-T11 No Picture no Sound No back lights

I am Willing to go as far as you guys are willing to help me.

Thanks

[Chuda33]

Re: Olevia 242-T11 No Picture no Sound No back lights

first of all thank you for your help. I went ahead and check the T Con. I see that there is voltage going through, but only about 9 volts. Is this right or not
Thanks

[Chuda33]

Re: Olevia 242-T11 No Picture no Sound No back lights

Which components should i be checking for problems in tne T Con board?

[budm]

Re: Olevia 242-T11 No Picture no Sound No back lights

To find out what voltage is needed for the T-CON, you will need to get to the LCD panel and look for the sticker that will give you the make and model number of the LCD panel, then you will be searching for the spec sheet of this panel, make sure to get the REV. number so you can match it exactly.
The spec sheet will give the pinout, the voltage, the current rating of the T-CON and the backlights inverter board (if the inverter board is made by the same mfg. of the LCD panel).