Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

[budm]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

1.8V (1117l-18) and 3.3V (1117l-33) series fixed output regulator.
You can test the DCV on all 3 pins with ref to the chassis GND to see what you get.

[TVRepairNoobie]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

I have included a close up picture of the Voltage Regulators for those interested.

[vinceroger69]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

Thanks for the follow up glad its working now and yes does look like those two voltage regulators? have been changed for some reason maybe if someone else has this fault they should check these first just in case.

[TVRepairNoobie]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

I think the flux points to what needs to be replaced.

[TVRepairNoobie]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

FYI: I'd received my replacement main board this afternoon from electroparts eBay seller.
At first I did not have much faith that this main board was going to work because of the flux paste on the board. but, it did. now, I just have to put the TV togather. thank you all for your help on this, especially to budm, and vinceroger69.

[vinceroger69]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

i wonder if a faulty/corrupt eeprom can cause this?

[TVRepairNoobie]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

I've added main board (899-KC0-GF271XA) with capacitor values if anyone need it.

[TVRepairNoobie]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

Dottos vinceroger69. It would only come in handy for me if I knew what component(s) to replace on the main board otherwise, it is useless to me.

[vinceroger69]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

Thats the trouble with ebay for that seller to say dispose of the item seems strange like he had a idea it may of been faulty at least you can keep it for parts etc they always come in handy.

[TVRepairNoobie]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

Probably, that was from the main board I was working with. otherwise, if I was the seller I would ask for the main board back if it was a known good board.

I will try the seller in CA. and see if they will take my offer for $30.

[budm]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

Thank god this is the note from seller when I requested a return for the main board. Please dispose of the broken part.

What does that mean? The seller sells broken board?

[TVRepairNoobie]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

Thank god this is the note from seller when I requested a return for the main board. Please dispose of the broken part.

[vinceroger69]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

seems a high price for a main board though? is this set 1080 or 720 resolution? for a 26inch set just seems a high price to pay here in the uk i wouldnt get much more for a fully working set.

[TVRepairNoobie]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

Thanks for the tip vinceroger69,

I've found a seller on eBay that has 2 main board with free shipping and returns.

http://www.ebay.com/itm/Polaroid-26-...UAAOSwrklVHG8i

[vinceroger69]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

Trouble is finding a good mainboard just look for the ones that offer free returns ive lost out a couple of times having to pay postage back etc.

[TVRepairNoobie]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

Ok, thank you much budm.

[budm]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

I left the connection to CN2 unplugged, then toke a measurement. value is the same 0.057 DCV.

Like I indicated, the main board signal is not reaching the connector that goes into the Inverter board CN2.

[TVRepairNoobie]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

I left the connection to CN2 unplugged, then took a measurement. value is the same 0.057 DCV.

[budm]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

Main board sends the command signals to the Inverter board.
If you check the resistance between the White wire connector on the Inverter board and the main board connector, one of the pin will show <1 Ohm, same for the Yellow wire.
Inverter does not send any signals to the main board.
The chassis module of the main board/power supply boards has plug that mates with the socket on the chassis.

[TVRepairNoobie]

Re: Polaroid FLM-2632, Blue LED, no sound, no picture, no backlight, cannot turn off

budm,

The main board has a parallel port that connects to it. i am not sure if main board is sending signal to Inverter board or vise versa.