TV Tech Support: Memorex TV Model MLT3221 - Black Screen, Still Semi-Functional

FlorianDietrich

Reputable
Apr 8, 2014
2
0
4,520
I have a 32" Memorex TV Model MLT3221. The TV is a hand me down, so I'm guessing that it is at least three years old, probably older. Recently the screen will go black while the blue power light stays on (no audio, no picture). Generally the remote and side controls stop working at this point.

If I do a soft reboot (power off, 5 seconds, power on), the problem continues. If I do a hard reboot (unplug, 30 seconds, replug), the problem is resolved until the next time the screen blacks out. It's blacking out with increasing frequency.

I use the TV as my computer monitor. I can't figure out how the input source would cause any issues. Please reassure me that this has nothing to do with it. I tried adjusting the video and audio setting to be less resources intensive (lower contrast, lower brightness, lower base). The screen just went black even faster.

I've been using the hard reboot solution to extend the life for about a week. Is there anything else that can be done? I found a Memorex repair kit on Amazon for $15, but I want to know how optimistic I should be about this. Technically I'd rate myself as a power user. I'm not particularly familiar with electronics, but I can probably grasp the basics.
 
Solution
How do I know that it is the capacitors and not the entire power board? I found a soldering kit for $20 and the capacitors for $10. I'll unscrew the back and poke around before purchasing. What should I be looking for to make sure that the power board is salvageable?
Its because the power board is starting to fail on the Tv.

To be exact the capacitors of the power board.
If of the electrolytic type used on the power board of the tv, they need to be replaced.
You can tell when they are gone or on there way out by looking at them.

If the tops are domes of the caps, and not flat, and any sticky liquid has seeped out.
or there is a brown sticky fluid on them.

Each cap needs to be de soldered and a new one soldered with the same ratings found on each cap the voltage and the farad ratings.

Here is the power board for the TV.
http://www.ebay.com/bhp/memorex-mlt3221

You will note the two caps and the large one on its side.


 

FlorianDietrich

Reputable
Apr 8, 2014
2
0
4,520
How do I know that it is the capacitors and not the entire power board? I found a soldering kit for $20 and the capacitors for $10. I'll unscrew the back and poke around before purchasing. What should I be looking for to make sure that the power board is salvageable?
 
Solution