Polaroid FLM-4034b issues

[landyboy]

Ok since you guys helped me fix my first set I picked up another one to try. Its a Polaroid FLM-4034b. It will power up to a blue screen with the words no input. I can get the menu to come up but thats it. It does click and pop a little and every so often it will make a loud buzz. The screen also appears to have random lines running through it at times. The screen also goes through different color patterns. I have opened it up and there are no "visual" signs of bad capacitors. Any ideas? thanks

[johnboy1313]

Re: Polaroid FLM-4034b issues

I've fixed several Polaroids similar to this one. It's more than likely either bad caps that aren't bulging or a main board going bad. These seem to be the only issues with these sets. Do you have an ESR meter? Can you post pics of your power supply and main board?

[johnboy1313]

Re: Polaroid FLM-4034b issues

Also, since it looks like you got the other one fixed. It would be nice of you to follow up on that thread and post what the fix was and that it is working. It helps anyone that might be having the same issue with the same set in the future.

[landyboy]

Re: Polaroid FLM-4034b issues

Yes I can get pics. I do not have an esr meter. I am out of town for a couple days I will post pics as soon as I get home. And yes I will update the other post.

[johnboy1313]

Re: Polaroid FLM-4034b issues

It's possible that you have a bad cap or two in the PSU, but I'm suspecting a bad main. I had a Polaroid FLM-323B with similar problems. The blue screen showed, the menu would show but the input screen wouldn't. It turned out to be a bad main board.

[landyboy]

Re: Polaroid FLM-4034b issues

Here are some pics...

[landyboy]

Re: Polaroid FLM-4034b issues

Did some checking main boards are hard to find for this model. Can the main board be fixed? Should I look for bad caps or is there something else I should look for?

[landyboy]

Re: Polaroid FLM-4034b issues

Should I check for bad Voltage Regs on the main?

[johnboy1313]

Re: Polaroid FLM-4034b issues

You can check the regulators, I've had four of these style TVs come across my bench in the last couple months. One of them had bad caps. The other three were all main boards. I checked all of the regulators and DC-DC converters and didn't find anything out of whack. If you haven't already, it wouldn't hurt to check the voltages coming from the PSU.

[landyboy]

Re: Polaroid FLM-4034b issues

Ok I found a what I believe to be an adjustable regulator out of tolerance.

1084 PE
Pin1 1.356
Pin2 2.603
Pin3 4.222

According to the chart provided on Badcaps pin 1 should be reading 0. Am I correct?

[landyboy]

Re: Polaroid FLM-4034b issues

I read the chart wrong, I think the reg is good. Pin2 is Pin1 plus 1.25v sorry.

[landyboy]

Re: Polaroid FLM-4034b issues

Voltages from the PSU are correct.

[landyboy]

Re: Polaroid FLM-4034b issues

I took some additional pics of the different phases of the screen.

[landyboy]

Re: Polaroid FLM-4034b issues

Thoughts?

[tom66]

Re: Polaroid FLM-4034b issues

Definitely looks like a main board issue to me.

The large BGA processor with the heatsink has probably overheated, this is introducing errors into the processing of the video.

You can try reflowing the processor, but it would only be a temporary measure, at best.

[landyboy]

Re: Polaroid FLM-4034b issues

Ok finally got back around to this one. Ordered a replacement main board and now I have this. I'm thinking another bad main board?

[budm]

Re: Polaroid FLM-4034b issues

That looks like Gamma voltage problem on the T-CON board like this SAMSUNG.
http://s807.photobucket.com/user/bud...?sort=3&page=1
All the connectors are properly seated?

[Dgtech]

Re: Polaroid FLM-4034b issues

Looks more like T-conn board failure to me.

[johnboy1313]

Re: Polaroid FLM-4034b issues

Could be T-Con, but could be a bad main as well. What does the menu look like with no signal applied?

https://www.badcaps.net/forum/showthread.php?t=27876

[kevinjo]

Re: Polaroid FLM-4034b issues

I also have the solarized video but it is not the tcon as I have tried 2 known working tcons. I think there is a main board issue but unsure where to look. Anyone have any ideas? Thanks. Mine is a FLM-3232.