Re: Memorex MLT3221 - No Power

Budm, is that all you had to replace to get the backlight working again?

Also, the first picture of that 8 legged IC, what was that? What was its function and did you have to replace it for the backlight or something else?

Also, this is for everyone, is it possible that the light or lights themselves went bad?

I saw someone selling a power supply on Ebay for testing the florescent tubes in laptop screens... I have to think that the voltage used to drive the backlight in a laptop is lower than in a TV, but...

Re: Memorex MLT3221 - No Power

DGtech, I have a lot of experience soldering/desoldering, but I am with you... I do not want to do more than needed. I am still ordering the other caps, but I am going to change the two 10uf caps first.

I put a flashlight up to the front of the screen and hit menu on my remote and I could see the menu. Should I try with a tv show? is there a difference in the menu and a picture from a tv channel or movie?

Which to fets are you speaking of? Q16 and 17? I made a few measurements in circuit with the tv on:

...

Re: Memorex MLT3221 - No Power

Ok, thanks. I guess I will be doing a cap inventory on that board tomorrow Unless someone here has already done it?

Edit: I'm not trying to be lazy, just wondering if someone had already put a list together. I did a few searches and could not find one. If I can get a good list together I will post it here. It looks like the replacements for EC17&18 will be a little taller.

Re: Memorex MLT3221 - No Power

You are right, I was just looking for a kit with all of the caps for that board.

Do I have to just order them separately? I only see one 10uF cap on the badcap.et store, but it is 400v rated. I would like to order from this site since I am getting answers and help from this site But the original caps are 450v, of course they were HEC which is probably why they failed.

So yes, I want to replace all of the caps on the board. Any suggestions of where I can find a kit with GOOD caps? Is there a kit I am not finding on the...

Re: Memorex MLT3221 - No Power

Thank you for the quick response.

I checked D10 and got .4v one way and the other way it climbed to 1.5v. I will take it out and retest.

Yes, those two caps are slightly domed, one more than the other. I will order them and replace.

Re: Memorex MLT3221 - No Power

If I need to start a new thread please let me know.

I have a Memorex 32 inch flatscreen tv, MLT3221
The power supply board is IPOS150 REV 1.8 20061125

1. TV was working fine

2. Power went out for a few hours

3. Power came back on. When I turned the TV on the sound worked, the red circle below the screen turned blue, but the screen was "black".

4. I shined my maglite on the screen while I had the menu on the tv up and I could see the menu options (brightness,...

Re: New Members - please post your introductions here

Hello, my name is Pete Nyberg. I live in Southwest Louisiana.

I entered the US Air Force in 1991 and was trained in Basic Electronics and PMEL (Precision Measurement Equipment Laboratory). Also called TMDE. I repaired and calibrated test measurement and diagnostic equipment to component level.

Once I left active duty and joined the reserves I got a job for the USGS as an electronics repair tech, again component level. I have worked in electronics ever since for different civilian companies (environmental...