Polaroid FLM 2632 wont power up, no lights

[stinger]

Hi, I have Polaroid flm 2632 that does nothing when plugged in and has no lights on in front. I have checked the power supply board at CN3 and have 24v at the 3 power pins but nothing at ps_on. When I put a resistor jumper from +24 to ps_on the backlights come on but still no light on front of tv. CN2 has 5 pins ground and 5 pins +24 and those are fine. I am unsure what powers the ps_on? Is it suppose to have +5v from the ps board or from the main board?

[budm]

Re: Polaroid FLM 2632 wont power up, no lights

Main board sends out PS_ON to the power supply board. Do you have 5v feeding the main board?
Pictures of the boards?

[selldoor]

Re: Polaroid FLM 2632 wont power up, no lights

PSon is usually 3v or so from the main board ,which is usually derived from 5v
standby from the power supply via voltage regulators. Using 24v sounds a bit dangerous.

[xredhawk]

Re: Polaroid FLM 2632 wont power up, no lights

try pushing on bottom left hand corner , below mainboard where junction box goes in connector , had same problem last week

[stinger]

Re: Polaroid FLM 2632 wont power up, no lights

It looks like this power supply board has output of 3 pins neg, 3 pins +24v and 1 pin ps_on which goes to main board. I dont know the circuitry of main board and how it changes 25v to 3v or 5v to switch PSon. I will try to get some pics of the boards tomorrow and post them. I did try pushing on the main where connector is but it didnt help.

[budm]

Re: Polaroid FLM 2632 wont power up, no lights

You use 1K resistor between the 5VSTBY and the PS_ON pin, BUT you must disconnect (or cut it long enough for you to be able to splice it back together) that wire (PS_ON) that goes back to the main board, if the PS_ON pin is stuck LO, it will not allow the PS_ON signal to go HI.

[stinger]

Re: Polaroid FLM 2632 wont power up, no lights

Where is the 5VSTBY, all the pins on the ps board are 24v. What would make it stick LO...

[budm]

Re: Polaroid FLM 2632 wont power up, no lights

Cannot tell until we see good clear pictures of the board.

[stinger]

Re: Polaroid FLM 2632 wont power up, no lights

Ok I will try to post them tomorrow...

Thank you

[budm]

Re: Polaroid FLM 2632 wont power up, no lights

There are more than one version of this model.
Which one of these is your power supply?
http://www.shopjimmy.com/catalogsear...aroid+FLM+2632

[stinger]

Re: Polaroid FLM 2632 wont power up, no lights

The version I have looks like "Polaroid 909-KC0-GF271XA Control Box"

[stinger]

Re: Polaroid FLM 2632 wont power up, no lights

CN3 connector circled green goes to the main board and has 3 pins ground, 3 pins +24v, and 1 PS_on(blue wire). CN2 circled orange has 5 pins ground and 5 pins 24v. Does the main board convert one of the 24v lines to the 3 or 5v to switch the PS_on? I could disconnect blue wire(PS_on) but dont have 5vstby to jump to.

[budm]

Re: Polaroid FLM 2632 wont power up, no lights

In this case, yes. So right now with just TV plug in but not turn on, do you get any DC voltage on any one of the output pins? We need to find the always on power supply section.

[stinger]

Re: Polaroid FLM 2632 wont power up, no lights

CN3 has +24V to all 3 pins when tv is just plugged in

[selldoor]

Re: Polaroid FLM 2632 wont power up, no lights

Can you test the small white fuse - cant see it in your picture -( they are not really clear enough for trouble shooting) It is on the board in pic 2 top right corner. Resistance test first then switch on and test voltage on bothe ends with respect to a ground screw.

[stinger]

Re: Polaroid FLM 2632 wont power up, no lights

I checked that fuse and it has 24.1 volts to both sides. I also checked the voltage regulators and some of those show no voltage. U5, U6, U7 show nothing.

[budm]

Re: Polaroid FLM 2632 wont power up, no lights

Those two TOROID inductors and the two 5-pin ICs close by are buck converters that steps the 24V down to around 12V to run the audio amplifiers section, the other is for 5V convertor for the logic circuit, its output is further stepped down by the linear regulators. You can try to find the spec sheet to see how it works check the output voltages of both circuits.

[stinger]

Re: Polaroid FLM 2632 wont power up, no lights

Sorry, been busy, first time in a few days to get back to checking tv. I checked the two 5-pin ic's...1501A 50 Vin +24.1v output 5.1 FB 5.1 SD 0
1501A 12 Vin 24.1v output 0 FB 0 SD 4.4

Looks to me like the 1501A 12 is bad. Would that cause U5, U6, U7 to not have voltage? And could that be why I am not getting voltage to PS_on? Its hard to tell what the circuits are not having a schematic, plus being a newbie.

Thanks ..

[budm]

Re: Polaroid FLM 2632 wont power up, no lights

You trace out and see if the output of that supply feed into the inputs of the regulators.

[Rudy.ALvarez91586]

Re: Polaroid FLM 2632 wont power up, no lights

I have the same problems did anyone fix this Problem