polaroid flm3201

[awyatt2]

anyone have any experience with the flm3201 tv it had a powersupply issue i fixed that now inverter seems to be the culprit, showing no visible signs of blown or burned parts.
i checked for menu and pic with flashlight all's well there. i cant seem to find a schematic on the inverter nor any thing backlight inv. related.

[budm]

Re: polaroid flm3201

Can you post the picture of the inverter board? Check the surface mounted fuses? 24vdc present?

[awyatt2]

Re: polaroid flm3201

i can get a picture, and i measure 17.8v going to the board, i felt that was low and it may very well be for this model i cant find any voltages in the service manual and its marked vcc on the board

[budm]

Re: polaroid flm3201

It should be 24vdc feeding the inverter board. We need good clear pictures of the Power supply and inverter boards. 17v is way too low.

[awyatt2]

Re: polaroid flm3201

pics wont upload it uses the Insignia 667-L32K5-20C Power Supply, cant find a schematic on it either. it was headed for the dump thought i may be able to save it. the previous owner tried to replace caps and made a mess, left the ps loose and it shorted across the maind took out fuse and protection diodes. if anybody has a print on this ps i would very much like to have a copy.i at least know the main and screen are good.

[budm]

Re: polaroid flm3201

That is expensive power supply:
http://www.shopjimmy.com/insignia-66...wer-supply.htm
Sorry, I do not have SCH for this board.

[awyatt2]

Re: polaroid flm3201

trying to upload pics of the ps.

[selldoor]

Re: polaroid flm3201

I am struggling to follow this:

Post1 it had a powersupply issue i fixed that

Post3 i measure 17.8v going to the board

Post3 i cant find any voltages in the service manual
Post5 if anybody has a print on this ps i would very much


Ok Does that mean The power supply is not working fully and you dont have a service manual or Schematic for either the Power Supply or the Inverter Board

Which Service manual do you have - just to save us downloading it again.

i at least know the main and screen are good.

How do you know that without a pS and Inverter?

Presumably the red wires are to a fuse holder?

Can we have pictures of fronts and backs of the other boards.

On the picture attached the component in the red box appears to be cracked? Is it? - what is the part number?

[tom66]

Re: polaroid flm3201

Hmm I have the same PSU but I'm about to give up on it as I was a complete doofus when fixing it and it's basically ruined, I was a noob at soldering. I can try and read off part #s.

Btw this TV has an 18V rail for audio (measures 17.8V on my board) and 24V for inverter. The two matched connectors are for the 24V.

[awyatt2]

Re: polaroid flm3201

selldoor, i have the ps working all but 24 volts, the servive manual is on the polaroid flm3201. as i said in the post i have pic and menus i used a flashlight to light the screen,yes red wires are to a fuse holder. the other boards i wont be concerned with till i get 24 volt rail on the ps up.

tom 66 how bad is it? possibly use parts from it? that is if you want to get rid of it.

[selldoor]

Re: polaroid flm3201

Ok that's a bit clearer how about
On the picture attached the component in the red box appears to be cracked? Is it? - what is the part number?

[awyatt2]

Re: polaroid flm3201

nope the part is a 5 volt positive regulator and the 5v is stable. the crack is not a crack it is a bit of loctite that was a factory dribble. something on the 24 v rail, i have checked diodes , resistors and the fets. dont know but i am loosing 7 volts somewhere.

[tom66]

Re: polaroid flm3201

What voltage do you get across the main big cap?

[awyatt2]

Re: polaroid flm3201

166v across main.at the 3 fets there are 2 diodes, marked 24v, at the end of the string on the diode i get 23.98v. if i only had a print to work backwards. the blooming board is double sided and you cannot see all the traces for components.

[tom66]

Re: polaroid flm3201

166v across main.at the 3 fets there are 2 diodes, marked 24v, at the end of the string on the diode i get 23.98v. if i only had a print to work backwards. the blooming board is double sided and you cannot see all the traces for components.

This should be 375 - 425V and is probably the cause of low voltages.

Check if there are any small orange electrolytic capacitors on the primary side, if so, try replacing them. They can cause this problem.

[awyatt2]

Re: polaroid flm3201

well, tom, you were right on the small 22uf 50v cap high esr, but no change when replaced still 166 across the main and 17.88v to the inverter. i have all the other voltages, still trying to figure this one out. thanks i wouldnt have looked if you hadn't mentioned it. look at it as a problem wating to happen if not addressed.

[awyatt2]

Re: polaroid flm3201

Tom, you led me down the right path, a shorted smd diode. now she works agian and i have to get it all back together. thanks man, i was looking on the wrong side for the problem,would have ended up junking it were it not for your insight on the input side. all is well here now and i can tell my daughter she has a lcd tv agian. i fixed her a proj rca for temp now she has a flatpanel.thanks to all, especially Tom!

[budm]

Re: polaroid flm3201

Good job, another failed PFC Voltage booster circuits. By the way, can you please post the pictures of the Diode and its location?

[awyatt2]

Re: polaroid flm3201

i can give you the number on the board the ps is working and my daughter picked it up just before i left for work. it was about 1/4 inch to the side under the mains cap.d105 i think was the number anyway it was 1 amp 200v so i used a 1n4002 to replace it.lucky the board sits high enough to allow this sub.

[awyatt2]

Re: polaroid flm3201

i can give you the number on the board the ps is working and my daughter picked it up just before i left for work. it was about 1/4 inch to the side under the mains cap.d910 i think was the number anyway it was 1 amp 200v so i used a 1n4002 to replace it.lucky the board sits high enough to allow this sub.