Toshiba 40E200U1 no picture problem !

[guiallard]

Hi, I try to repair a tv of a friend, sound OK, but no picture at all. So, It's the Powersupply board problem or the backlight problem. The thing is I try to find the Service Manual to find what Voltage DC on the wire that goes between the powersupply board and the backlight board. Can somebody help me to find it ?

Thank you

From Guillaume (A new user here! )

[guiallard]

Re: Toshiba 40E200U1 no picture problem !

[guiallard]

Re: Toshiba 40E200U1 no picture problem !

how mutch voltage im suppose to have for all these pins!? Thanks

[budm]

Re: Toshiba 40E200U1 no picture problem !

Connect everything back up and take the Voltage reading on all the pins (make sure to put the pin names on each readings) when TV is plugged in but not turned on,and when the power switch is activated. use chassis as the ground ref point.
Also upload the pictures of the whole board and pictures of each connectors so we can easily read the labels.

[nickb2]

Re: Toshiba 40E200U1 no picture problem !

Hello, just joined this site.

I am in the process of trying to resurrect my toshiba 40e200u1. I also have the same problem.

No picture, have sound. I have all necessary 24v and 5 volt BL-on and all grounds are good.

I did try the so called flashlight test, can't anything at all.

So, I am assuming the main board and power supply are not in fault as it powers up, stays on, has sound and back-light invertor is getting power, 5 volt signal and ground.

Am I correct to assume this?

I removed the invertor board and found this. See pictures below. Any advice as how to proceed would be greatly appreciated.

I am an automotive technician, so I am very at ease with electrical checks and soldering. I am just not a TV technician, but I have fixed many power supply issues on projection tv's and pc monitors.

First time trying to fix a back-light invertor. I'm pretty sure that burnt spot is my problem and probably need a new invertor board.

But I thought I would some of you knowledgeable guy's if I should look at anything else while I am in there.

I have another question, since I saw nada with the flashlight test, is there maybe something else wrong, like the T-con maybe?

Thanx in advance.

Nick

[ReeceyBurger123]

Re: Toshiba 40E200U1 no picture problem !

Hello, just joined this site.

I am in the process of trying to resurrect my toshiba 40e200u1. I also have the same problem.

No picture, have sound. I have all necessary 24v and 5 volt BL-on and all grounds are good.

I did try the so called flashlight test, can't anything at all.

So, I am assuming the main board and power supply are not in fault as it powers up, stays on, has sound and back-light invertor is getting power, 5 volt signal and ground.

Am I correct to assume this?

I removed the invertor board and found this. See pictures below. Any advice as how to proceed would be greatly appreciated.

I am an automotive technician, so I am very at ease with electrical checks and soldering. I am just not a TV technician, but I have fixed many power supply issues on projection tv's and pc monitors.

First time trying to fix a back-light invertor. I'm pretty sure that burnt spot is my problem and probably need a new invertor board.

But I thought I would some of you knowledgeable guy's if I should look at anything else while I am in there.

I have another question, since I saw nada with the flashlight test, is there maybe something else wrong, like the T-con maybe?

Thanx in advance.

Nick

Hello please read this:

https://www.badcaps.net/forum/showth...=Ssi_400_14a01

[dick_barton]

Re: Toshiba 40E200U1 no picture problem !

It looks like one of your inverter transformers has burnt up (brown mark on board).
Can you measure and compare the resistance measured you have between the pins on each of the transformers, one against the other.

[dick_barton]

Re: Toshiba 40E200U1 no picture problem !

Looks like ReeceyBurger123 post has highlighted your problem. Looking again at your pictures the burn marks are under the mosfets and not the transformer as I first thought.

[ReeceyBurger123]

Re: Toshiba 40E200U1 no picture problem !

Its not tarfo DB but the little driver mosfet for it. This is caused by heat as the mosfets run very hot because they are being pushed very hard. Read the thread I linked its a common issue.

[nickb2]

Re: Toshiba 40E200U1 no picture problem !

Thx a bunch all.

I knew I came to the right site. I have been giving advice on another forum. It's called BAT auto. If any of you ever need some automotive advice, come check me out there.

I piggy backed this thread. Should have started my own one, but will continue here.

I checked out a few things on the invertor board and found the micro fuses F101 and F102 to be open.

125v 7a littelfuses I believe.

Now I don't know if this is a good Idea, so I will sound/bounce my idea off you all.

I included some fuzzy pictures, my cell phone is ancient. In one of the pictures, you will notice I quickly soldered in some wire to bridge the fuse gaps in the hope of that helping me trace the PCB.

Good or bad idea.

I have not installed the board without the fuses. I do know there is no way in hell that invertor board could function with those two fuses open like that.

My gut feeling tells me that even if I install new fuses, this board is far from be fixed. But I have to start somewhere, right?

[vinceroger69]

Re: Toshiba 40E200U1 no picture problem !

just dont power it up, too blow both 7 amp fuses maybe a invetor tranformer/mosfet etc is short circuit is there any writing on top of the transformers ? also what is the invertor board part number.

[budm]

Re: Toshiba 40E200U1 no picture problem !

Read post 6, you will probably need to replace the MOSFETs and the controller IC.
I believe this is your board:
http://www.shopjimmy.com/toshiba-rca...t-inverter.htm

[vinceroger69]

Re: Toshiba 40E200U1 no picture problem !

Read post 6, you will probably need to replace the MOSFETs and the controller IC.
I believe this is your board:
http://www.shopjimmy.com/toshiba-rca...t-inverter.htm

oh yes i remember reeces thread on this now they dont seem easy boards to fix
https://www.badcaps.net/forum/showth...=Ssi_400_14a01

[nickb2]

Re: Toshiba 40E200U1 no picture problem !

Oh, plz don't laugh at my soldering job or at my smart multimeter.

Although I do like that funky little multimeter. It great for around the house work like this.

So, back to the inv board. I scoured the net for a replacement board, they are very hard to come by. Everyone is out of stock or they are sold. E-bay has a few left, but I am iffy about the revo 3 boards. They say it is for toshiba models 40E200U. Like I said before, mine is a 40E200U1.

Would the SSI-400-12AO1 revo 3 fit in lieu of the SSI-400-14AO1 revo 1 boards?

Connections look the same, but the revo 3 is not the same format transformer wise. Caps are only three on board while mine has four.

So, I think I will have to either fix mine, if at all possible or wait to find a used or new inv board.

One service guy made me laugh today. I think I new more than him. He said sorry, those boards are out of stock and discontinued. He said toshiba went out of business. I said who cares. They made that board for about 15 different makes and models.

I called ShopJimmy. He new more about what he was talking about. He also said out of stock, even on the substitute ones. But he did have the repair kit in stock. 15$ + shipping.

The repair kit comes with the 14 transistors and the IC and the two fuses I mentioned above.

I find that alot of work for a 20$ used inv board. I will try to track down those fuses. I live in a region with very limited electronic stores. I would have to drive down to montreal to go see the guy's at addison electronics. That's where I go for my caps and and other audio visual repair stuff.

I wanted to bounce another idea. I can get microwave fuses that are rated 125v @ 7 amp. My thought was to solder two of those on those trace wires I soldered.

Good or bad idea??

I can get those down the street where I buy my home appliance parts.
I know the microwave fuses are 6$ a pop, but cheaper than driving 2 1/2 hrs to montreal.

I uploaded the two similar boards for comparison. Just thought that would trigger a yes or no answer from one of you guy's in regards to my question.

Thx again for bearing with me. I am french, so sometimes my translation may be a bit messed up. But I do ok in the english department, enough to get my ideas across.

[nickb2]

Re: Toshiba 40E200U1 no picture problem !

@Bud and VinceRoger.

Yes that is my board. The transformers read as follows

M LT-4014-1 followed by UO 103l C Y

I linked one here.

http://www.ebay.com/itm/MLT-4014-1-L...-/161801165776

I read the thread Reece linked to. I definitely don't want to have to go through all that.

He fell on one very fussy board. I have a feeling mine is the exact same thing.

He was very patient. Hope he likes his new scope.

[vinceroger69]

Re: Toshiba 40E200U1 no picture problem !

reece im sure will be able to advise you on this board and maybe which pins to check the windings on the transformers for shorts etc as i have never worked on one of these boards the shopjimmy kit isnt a bad price if it includeds all the bits needed.

[ReeceyBurger123]

Re: Toshiba 40E200U1 no picture problem !

You should use the original type smd slow blow 7a but the one suggested will work but might not limit as much damage in future cases. Also the board pictured has two less bulb connectors so they are not interchangeable.

Also the repair kit you should change all the transistors and the controller Ic as well as resoldering almost every smd resistor and part on the board as if they break lose they will blow the new fets. Also the transformer isnt burning the parts either !

[nickb2]

Re: Toshiba 40E200U1 no picture problem !

Ok, Thx reece.

So I will not focus on the transformers and again thx for seeing the lacking tabs for the CCFL's on the other 12AO1 board. I missed that. I did not count them. Should have been the first I should have done.

Had I done so, I would not have mentioned that. Your reply was very helpful.

If you are referring to the fuses I mentioned for microwaves, I do believe they are slow blow also, hence the hefty price tag.

Something like this was my idea, since the leads are already soldered in, a five pack should do the trick If I mistakenly blow one or two in the process of repairing this crappy a$$ board.

http://www.ebay.com/itm/5x-5x20mm-7A...-/161155524101

[dick_barton]

Re: Toshiba 40E200U1 no picture problem !

It's really hard to tell from your picture because it's too small but the inverter board looks identical to one I've recently salvaged out of a Logik L40DIGB20.
Board details:
Samsung Electro - Mechanics

SSI_400_14A01
REV0.1
2008.11.13

Yellow label:
02098ECA2608606A1
INV40N14B

It may be worth your while looking to see if they are identical boards and if they are if the Logik board is more easily available.

[nickb2]

Re: Toshiba 40E200U1 no picture problem !

Yes, that is indeed the exact same board. However, every link I hit is across the pond. UK. If push comes to shove, I will pay the extra for overseas shipping.

Again, thx.