32" Dynex DXL3210A Won't Power On

**selldoor** · 07-26-2012, 04:23 AM

Re: 32" Dynex DXL3210A Won't Power On

You need to connect a known source signal either a video playing or a pc showing a vivid picture is good, then you look at the screen, sometimes a flashlight helps, try various angles to see if you can see the picture (very dark) of what would be on screen if it was working properly.

**tieny** · 07-26-2012, 09:17 AM

Re: 32" Dynex DXL3210A Won't Power On

Doesn't seem like the pixel are on at all. I not sure which input the TV is even on, the last time it worked it was on HDMI so i used that input but I can't see any movement what so ever.

**ben7** · 07-26-2012, 09:45 AM

Re: 32" Dynex DXL3210A Won't Power On

Originally posted by tieny

Doesn't seem like the pixel are on at all. I not sure which input the TV is even on, the last time it worked it was on HDMI so i used that input but I can't see any movement what so ever.

I know it sounds crazy, but get a hairdryer and heat up the board, just not too hot to touch though. And then see if it will work. Sometimes chips and capacitors have a bad habit of not working when cool.

**tieny** · 07-26-2012, 10:10 AM

Re: 32" Dynex DXL3210A Won't Power On

Any area of the board in particular? I have a heat gun from one of my last projects when i was trying to reflow a chip, but it didn't end well when it accidentally blew up an SMD capacitor right next to it (actually exploded)

.

**ben7** · 07-26-2012, 10:12 AM

Re: 32" Dynex DXL3210A Won't Power On

Originally posted by tieny

Any area of the board in particular? I have a heat gun from one of my last projects when i was trying to reflow a chip, but it didn't end well when it accidentally blew up an SMD capacitor right next to it

.

Id use a hair dryer, and don't put it right up to the board, or you will overheat stuff. Check the temp of things too to make sure they don't get too hot. Do it over the whole board, starting in one area and moving around the rest of the board.

**tieny** · 07-26-2012, 10:24 AM

Re: 32" Dynex DXL3210A Won't Power On

Hmm, I think it worked! Well for a second, I was pressing the power button while warming up e board, and the red LeD turn blue for a second but back to red o.o

**electronicsurplus** · 07-26-2012, 10:31 AM

Re: 32" Dynex DXL3210A Won't Power On

Originally posted by selldoor

Hi Jon
You asked why no-one answered you? I think I have told you before that
we are all just volunteers so we have lives to lead outside badcaps and join in when we feel like it, if we know something that might help or if we think someone is about to do something dangerous. .
If you have read this post thoroughly you will know that having tried all the
usual stuff and some pretty unusual stuff we are really struggling to fix thisIt is not any easier because it is not a mainstream make.

You then come in and say you have the same problem???? so what would you expect us to say - "Sorry Jon we have no idea what might be wrong with your set."
As it happens you now say that you probably dont have the same set so anything we might have said would not apply- you could have compared the boards before you posted or you could have simply waited and watched the thread until a fix was found?

I suggest you start your own thread ( I recall suggesting that to you once before?)
Posting pictures of your boards - you will be able to do most of the tests
as per this post and state your results and part numbers then someone might take a bit of interest.

You are correct, thank you

Although the set is the same model, the board is different

Thanks

Jon

**electronicsurplus** · 07-26-2012, 10:34 AM

Re: 32" Dynex DXL3210A Won't Power On

Originally posted by ben7

What?! no, sometimes people don't answer you right away...

I was not referring to this time. I was referring to in general. Maybe it is me.

thank you for the response

Jon

**ben7** · 07-26-2012, 10:44 AM

Re: 32" Dynex DXL3210A Won't Power On

Originally posted by tieny

Hmm, I think it worked! Well for a second, I was pressing the power button while warming up e board, and the red LeD turn blue for a second but back to red o.o

Tieny:
Hooray! well, sort-of. Where were you warming it up?

Electronicsurplus:
Ok, your welcome. Remove the connectors that go to the T-con and power it up; see if you can get the backlights to come on then, and also the sound to work. If not, then the problem is on the mainboard. First I'd suggest measuring the voltages of all the voltage regulators on the board.

**tieny** · 07-26-2012, 10:49 AM

Re: 32" Dynex DXL3210A Won't Power On

I'm not sure, I'm using my heat gun about half a foot away from the board. I warmed the right side, then the left side but no luck so I just warmed the whole board in general and thats when it turned blue.

What kind of problem would this mean?

**ben7** · 07-26-2012, 10:50 AM

Re: 32" Dynex DXL3210A Won't Power On

Originally posted by tieny

I'm not sure, I'm using my heat gun about half a foot away from the board. I warmed the right side, then the left side but no luck so I just warmed the whole board in general and thats when it turned blue.

huh

Have you tried tapping the board with a pencil eraser? You either have a bad capacitor, IC, or a bad solder joint.

**tieny** · 07-26-2012, 11:00 AM

Re: 32" Dynex DXL3210A Won't Power On

What do you mean tapping it with a pencil eraser?

**ben7** · 07-26-2012, 11:03 AM

Re: 32" Dynex DXL3210A Won't Power On

Originally posted by tieny

What do you mean tapping it with a pencil eraser?

Tap the board with the end of a pencil which has an eraser on it, the eraser is soft so you wont damage anything.

This is just a vibration test basically. Bad solder joints will connect/disconnect when heated, cooled, and vibrated.

**tieny** · 07-26-2012, 11:14 AM

Re: 32" Dynex DXL3210A Won't Power On

I tried tapping the main board while repeatedly pressing the power button but no luck. I tried the heat gun again but I can't simulate what happened like before, I guess it was just luck.

**ben7** · 07-26-2012, 11:16 AM

Re: 32" Dynex DXL3210A Won't Power On

Originally posted by tieny

I tried tapping the main board while repeatedly pressing the power button but no luck. I tried the heat gun again but I can't simulate what happened like before, I guess it was just luck.

How hot did you heat it up? Like just barely warm? Just don't heat it up anymore than you can tolerate on your skin. (Don't want to boil the water in the capacitors :P)

**tieny** · 07-26-2012, 11:18 AM

Re: 32" Dynex DXL3210A Won't Power On

It was hot enough where it would tingle my finger when touched but not so hot that it would burn the skin i think.

**ben7** · 07-26-2012, 11:20 AM

Re: 32" Dynex DXL3210A Won't Power On

Originally posted by tieny

It was hot enough where it would tingle my finger when touched but not so hot that it would burn the skin i think.

Well, idk what to check next.

**tieny** · 07-26-2012, 11:25 AM

Re: 32" Dynex DXL3210A Won't Power On

I noticed that these caps feel particularly warm after I let the board cool down for a good amount of time after I heated it.

Attached Files

**ben7** · 07-26-2012, 11:30 AM

Re: 32" Dynex DXL3210A Won't Power On

Originally posted by tieny

I noticed that these caps feel particularly warm after I let the board cool down for a good amount of time after I heated it.

If you have extra caps on hand you can try changing them.

I think they may just be warm because they have a larger mass and so they hold the heat longer.

Of course though, bad capacitors will get warm, so they might be bad (JH is crap, if you fix this I'd recommend replacing all JH caps) after all.

**tieny** · 07-26-2012, 11:49 AM

Re: 32" Dynex DXL3210A Won't Power On

Well, I measured the 3 caps 1000uf 35V out of circuit, and all have ESR of 0.04 ohms or less, 989.5uf, 1002 uf, and 1034 uf

32" Dynex DXL3210A Won't Power On

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