Unknown LCD TV

[rigeback]

Found this TV last week that I've never heard of before, brought home since panel would also be nice as PC monitor 'for the wife', anyways it runs on a
12V external power supply that did not come with the TV but I have a few around the house.
So the problem here I believe is the inverter as the TV comes on with menu for about 3 seconds and then shuts down, the standby light remains green.
I tested the back lights with another PSU/inverter and it seems they are working, I might utilize this panel with another PC video card but it seems the harness to the T-con socket will require a relocation of some wires as the PC desktop did not show only colors, red to green as if it was calibrating?
I changed out one cap C13 which was reading fairly low as you can probably see in the pic 'sh*t' soldering but no change in operation, the ceramic caps
C1 & C2 near the transformers also have an odd reading 6.5 Ohms both ways, is this normal?

[tom66]

Re: Unknown LCD TV

C5 and C6 could cause this fault. Looks like something got quite hot around there.

[rigeback]

Re: Unknown LCD TV

The 2 resistors next to these caps also read 6,6 Ohms both ways!

[tom66]

Re: Unknown LCD TV

The 2 resistors next to these caps also read 6,6 Ohms both ways!

Maybe they're in parallel?

[mockingbird]

Re: Unknown LCD TV

Change all the electrolytics... Two on the inverter and three on the logic...

You'll also need to re-cap the brick... If you can't pry it apart, use a dremel. Don't cut too deep though.

[rigeback]

Re: Unknown LCD TV

Change all the electrolytics... Two on the inverter and three on the logic...

You'll also need to re-cap the brick... If you can't pry it apart, use a dremel. Don't cut too deep though.

Yes I agree with re-capping of the boards but as for the brick I don't have it!
I believe its 5A-12v and I think I will try to install a internal PSU as I don't have 5A bricks.

[rigeback]

Re: Unknown LCD TV

I tested the back lights with another PSU/inverter and it seems they are working, I might utilize this panel with another PC video card but it seems the harness to the T-con socket will require a relocation of some wires as the PC desktop did not show only colors, red to green as if it was calibrating?

My best alternative here might be to utilize the PSU - Video card that is working https://www.badcaps.net/forum/showthread.php?t=16712

[rigeback]

Re: Unknown LCD TV

I hooked up the other video board with its PSU which tested fine on the back light test but with video hooked up same scenario, shuts down within 3 seconds and led remains green! I did move 1 ground wire to match the original harness and I could see the desk top on boot etc.
I'm suspecting that this could also be a T-con related problem now??

[rigeback]

Re: Unknown LCD TV

After reading a post and Retiredcaps thread I remembered that one side of my panel had delayed on start up and what I'm seeing now is one of the ccfl wires heat shrink has almost fallen off its connecting tube! Will split the panel tomorrow when theres better light.
How are these wires connected to the lamps, are they soldered??

[Scenic]

Re: Unknown LCD TV

Yeah. There's a metal pin coming out at the end of the CCFL tube, and the wire is usually wrapped around that pin and then soldered onto it.

The tricky part is if the end of the CCFL is enclosed in some sort of rubber block / endcap, which can be a bit of a pain to cut open without destroying the whole thing.

[retiredcaps]

Re: Unknown LCD TV

Yeah. There's a metal pin coming out at the end of the CCFL tube, and the wire is usually wrapped around that pin and then soldered onto it.

The tricky part is if the end of the CCFL is enclosed in some sort of rubber block / endcap, which can be a bit of a pain to cut open without destroying the whole thing.

Example below.

http://www.ccflwarehouse.com/lasotu.html

[senndogg]

Re: Unknown LCD TV

yesterday i had success in rewiring a pair of upper ccfls. it was a no name italian monitor too, just like yours. and from my experience (tiny comparing to some gurus in this forum) all cheapo brands suffer from bad wiring. had more than 20 cases just like this because where i live cheapo brands are very common. all have same components and parts and different strange names.

[rigeback]

Re: Unknown LCD TV

Well done with the wiring! My panel is OK no busted wires or shorts, tested the lamps and they work perfectly, the panel is a http://www.digitalview.com and is well made, the video/TV board and inverter are a pos.
I'm in the process of changing the caps that I bought today but I don't think the caps are the solution I think there could be a problem with MP1410 2A Step Down DC to DC Converter, I will know more after fitting the caps!

[lti]

Re: Unknown LCD TV

Check D1 on the inverter board (located above J5 in the first picture). It looks like its plastic case has melted.

[rigeback]

Re: Unknown LCD TV

Well as I mentioned before the readings on MP1410 were just the same after recapping most of board with 12V, that led me back to the PSU question?? Tried 5 different bricks all 12V and no ways would it start then as a last alternative I rigged it up to my test computer's PSU and bingo the panel works great. I manage to fined a manual and will look for another brick or mounted PSU tomorrow so suspend will work.
Thanks for all the feed back.

[budm]

Re: Unknown LCD TV

Are the bricks you tRIED rated at least 5A?

[rigeback]

Re: Unknown LCD TV

One brick was rated for 6A but the voltage was higher than 12V around 12.7V the suspend light would come on but no amber to green, the 2A would start it up but the inverter would shut down, strangely the Hannstar PSU would run the CCFL's but the video card was not supported and would also shut down.
The stripping of the panel was worth it as there was a lot dust and soot, they must of had this tv next to a fire place!

[tom66]

Re: Unknown LCD TV

The stripping of the panel was worth it as there was a lot dust and soot, they must of had this tv next to a fire place!

Or smokers. I had a plasma TV to repair which was brought down by cigarette smoke.

[rigeback]

Re: Unknown LCD TV

Yep I used oven degrease to clean out chassis and isopropolyn to clean the boards, I wouldn't have thought ash could get inside a panel though, this makes me think about my 50" which is in the same room as the pellet heater, lots of fine dust so might blow it out with compressor this summer.