LCD Not Working

[Menessis]

OK guys. I picked up a SOYO MT-SYTPT3227AB LCD DOA. I'm not a tech. But I do build cirucuit boards from plans and so forth. I have a multimeter!

So maybe I can get this thing working with some help of course. All it wil do when plugged in is show the red led.

I pulled it all apart to look and see what I could find. The "main" fuse "F1" is working. I think that would be a good sign.

Here are a couple of pics of the power supply.

So what do you thinK ??? There is one spot that looks like it got hot. Dont see any bulging Caps!



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Any help will be great. Thanks

Menessis

[retiredcaps]

Re: LCD Not Working

Here are a couple of pics of the power supply.

Dont see any bulging Caps!

First, please edit your original post so that images are NOT inline. Use the manage attach feature.

Second, umm, you have 7 obviously bad caps in the lower right hand section of the power board. Since you have 7 bad caps, many here will recommend that you replace the ALL. All means all.

Use quality low ESR caps from this list ...

https://www.badcaps.net/forum/showthread.php?t=2280

[Menessis]

Re: LCD Not Working

OK I think I fixed the "inline image" problem. Sorry about that.

This is great. I was looking for a bulge along the length of the caps. But looking at the picture online is when I seen them bulged at the end! You learn something everyday!

So to replace the caps, should I do all the little ceramic ones too?

BTW thanks man.

Menessis

[retiredcaps]

Re: LCD Not Working

OK I think I fixed the "inline image" problem.

Nope, still inline.

But looking at the picture online is when I seen them bulged at the end!

Once you see a bad one, it will be obvious in the future.

So to replace the caps, should I do all the little ceramic ones too?

Just replace all the electrolytic caps. I count 13 (not including the big one on its side). The big one rarely, but not never, fails.

Caps can also fail without the obvious physical defects. They can be out of uF tolerance (a 1000uF cap may only measure 25uF) or have high ESR (ohms).

Caps can be purchased here at badcaps.net to help support this site or they can be purchased at the big distributors like digikey or mouser. Badcaps sells Rubycon and Samxon. Digikey and mouser carry Panasonic and United Chemicon.

Make sure to get the correct physical dimensions correct.

[Menessis]

Re: LCD Not Working

I can get the replacement caps here today and see what happens.

Menessis

[retiredcaps]

Re: LCD Not Working

I can get the replacement caps here today and see what happens.

If "here" means Radioshack or some local electronics store, I would suggest you do not proceed. Radioshack does not stock low ESR capacitors. The same goes for most general electronic stores. SMPS power supplies require low ESR capacitors to function properly.

However, should you live in a big city or am lucky to have a local store that carries caps in the list I posted earlier, then go for it.

Rubycon MCZ, Panasonic FM and FC series are favourites among members here.

[Menessis]

Re: caps

Well they do have the panosonic caps. No RadioShack! lol I will go see what I can find and take it from there. Have to hurry cuz I have another stop on the way.

Thanks again.

[crepiduse]

Re: LCD Not Working

I concur, replace all caps with Rubycon or Panasonic. ALL CAPS!. Then you should be ok, if not, definitely better than you were.

[retiredcaps]

Re: caps

No RadioShack!

I have nothing against RadioShack (aka The Source in Canada). I have fond memories of them from childhood, but RadioShack just does not sell the correct capacitors required for a SMPS application.

[weirdlookinguy]

Re: LCD Not Working

What's wrong with inline pictures? With the new auto resizer that Topcat put in, they resize themselves and fit my screen just fine. I don't have to do any horizontal scrolling. It is easier for them just to appear fit to size automatically thanks to the auto resizer that Topcat put in than to have to open a bunch of attachments that don't resize themselves.

Are you using IE? I think that last time I used IE, the auto-resizer didn't work and inline pictures loaded full size. Now THAT was a pain in the ass. In Firefox and Opera, the auto resizer works.

[Wrog]

Re: LCD Not Working

What's wrong with inline pictures? With the new auto resizer that Topcat put in, they resize themselves and fit my screen just fine. I don't have to do any horizontal scrolling. It is easier for them just to appear fit to size automatically thanks to the auto resizer that Topcat put in than to have to open a bunch of attachments that don't resize themselves.

Are you using IE? I think that last time I used IE, the auto-resizer didn't work and inline pictures loaded full size. Now THAT was a pain in the ass. In Firefox and Opera, the auto resizer works.

The problem is that you still have to wait for the entire image to load before it resizes itself. That, and in 6 months time, who knows if the images will still be at that same (offsite) location to help future users?

[retiredcaps]

Re: LCD Not Working

What's wrong with inline pictures?

Let me count the ways.

1) Just last week, someone posted 12 MB worth of inline pictures in post #1. With 20 posts per page, it means everytime I come back to read, I have to load 12MB each and every time. 20 posts * 12 means I waste 240MB just loading the page.

Some ISPs have monthly usage caps and charge extra for usage.

2) Offsite picture hosting may not exist in the future. User accounts come and go. Or what used to be a free hosting site and then converted to a premium site and the pics no longer load.

3) Right now, I'm using a 9 inch diagonal netbooks and the scrolling back and forth make it impossible to read.

4) The 9 inch netbook has a very slow "write" solid state disk (SSD). When I download 12MB of pictures, the browser writes 12MB to the cache located on the SSD and it is very slow. It also means 12MB of cached data is possibly deleted in order to make room for a picture that I may not need to see again.

[Menessis]

Re: LCD Not Working

Kind of funny....I'm more confussed about posting the pics them I am about replaceing the caps!

Are you saying not to use PhotoBucket? Some instructions please. Im in the same boat, pay for bandwidth!

Menessis

[Wrog]

Re: LCD Not Working

Kind of funny....I'm more confussed about posting the pics them I am about replaceing the caps!

Are you saying not to use PhotoBucket? Some instructions please. Im in the same boat, pay for bandwidth!

Menessis

Correct, don't use Photobucket. Just use the "Manage Attachments" button when you are posting!

[Menessis]

Re: LCD Not Working

OK NO PhotoBucktet!

I struck out getting the caps locally! There web page says they have the Panosonic but when I get there.....poof, no Panosonic!

So I will be looking at the caps link here.

Menessis

[Menessis]

Re: LCD Not Working

OK in order to get these caps from you can I give you a list? I tried the link but it gave me an error page.

1) C41 – 22uf 50v 5mm x 12mm
2) C41 – 47uf 35v 5mm x 12mm
3) C33 – 1000uf 10v 10mm x 16mm
4) C34 – 1000uf 10v 10mm x 16mm
5) C30 – 1000uf 16v 10mm x 20mm
6) C31 – 1000uf 16v 10mm x 20mm
7) C40 –1000uf 10v 10mm x 16mm
8) C32 – 1000uf 16v 10mm x 20mm
9) C37 – 1500uf 16v 10mm x 20mm
10) C23 – 470uf 35v 10mm x 16mm
11) C21 – 470uf 35v 10mm x 16mm
12) C20 – 470uf 35v 10mm x 16mm
13) C19 – 470uf 35v 10mm x 16mm

There is lots of room for extra length. Let me know what you can do.

Thanks again.


Menessis

[Wrog]

Re: LCD Not Working

If "you" means Topcat (the owner of this site), you may want to send him a private message with what you are asking since he likely doesn't read every thread. He would probably be interested in why the electronic checkout isn't working as well (which links you are clicking on). Good luck with the repair!

[retiredcaps]

Re: LCD Not Working

1) C41 – 22uf 50v 5mm x 12mm
2) C41 – 47uf 35v 5mm x 12mm
3) C33 – 1000uf 10v 10mm x 16mm
4) C34 – 1000uf 10v 10mm x 16mm
5) C30 – 1000uf 16v 10mm x 20mm
6) C31 – 1000uf 16v 10mm x 20mm
7) C40 –1000uf 10v 10mm x 16mm
8) C32 – 1000uf 16v 10mm x 20mm
9) C37 – 1500uf 16v 10mm x 20mm
10) C23 – 470uf 35v 10mm x 16mm
11) C21 – 470uf 35v 10mm x 16mm
12) C20 – 470uf 35v 10mm x 16mm
13) C19 – 470uf 35v 10mm x 16mm

Hmm, I looked through badcaps.net stock and they have no stock in either Rubycon or Samxon for caps 1 and 2.

All the others are available, but I would hate to pay shipping/postage twice to get some caps from here and others from another supplier.

Digikey has all the caps in Panasonic FM except 47uF 35V which is available in FC.

[Menessis]

Re: LCD Not Working

OK I'm looking at caps. Thousands upon thousands!

Does this look like what I'm after???

EEU-FR1E102


Thanks

Menessis

[retiredcaps]

Re: LCD Not Working

Does this look like what I'm after???

I see you updated your country profile.

Yes, that is the correct mouser url for Panasonic FM caps. IIRC, smason, another fellow Canadian here, orders from digikey.ca and gets his caps in usually less than 48 hours.

You can choose mouser.ca or digikey.ca. I believe digikey is cheaper in terms of shipping ($8 USD) to Canada than mouser.ca ($20).

If ordering from digikey.ca, I usually put this in the search field to quickly narrow down the right parts ...

"1000uf 16v fm"
"1500uf 16v fm"
"47uf 35v fc"

Since it costs $8 for s/h, you might as well get a spare cap or two and other electronic components to offset the $8.