No Picture Samsung LED TV

[budm]

Re: No Picture Samsung LED TV

That much Voltage drop between the two legs of the fuse means the fuse has quite a resistance to it. Current flows through 0 Ohms have no Voltage drops on 0 Ohms.
Basically the Voltage should the same on both ends of the fuse.
If he uses Ohm meter in K Ohm range or higher then the meter will not have the resolution to show low resistance. Try measuring 10 Ohms resistor on K or M Ohm scale and see what you have.
When you have resistance in the path of the current flow you will have Voltage drops on that resistance.

[vinceroger69]

Re: No Picture Samsung LED TV

Post 36
https://www.badcaps.net/forum/showth...645#post718645
It is impossible to have fuse with 0 Ohms reading and have 12.85VDC on one end and 6.5V on the other end of the fuse. So Basically you have 6.35 DCV drops on 0 Ohm! Got to be measurement error.
What scale are you using in Ohm mode?

i never thought of it that way budm so must be a error in measurements as if tcon/panel was loading the 12v supply down it would be the same both sides of the fuse

[budm]

Re: No Picture Samsung LED TV

Post 36
https://www.badcaps.net/forum/showth...645#post718645
It is impossible to have fuse with 0 Ohms reading and have 12.85VDC on one end and 6.5V on the other end of the fuse. So Basically you have 6.35 DCV drops on 0 Ohm! Got to be measurement error.
What scale are you using in Ohm mode?

[vinceroger69]

Re: No Picture Samsung LED TV

if the fuse reads short its good re connect the tcon back up in the tv but leave one of the top ribbon cables disconnected turn the tv what do you see on the screen then put the ribbon cable back in and take the otherside out what do you see on the screen

[blackfro26]

Re: No Picture Samsung LED TV

Use your multimeter set to ohms and measure resistance across the fuse F100 which should measure 0 ohms. Set power off.

Yes I do, and result the fuse is short. But I dont know where part to check or make the fuse short

[dick_barton]

Re: No Picture Samsung LED TV

Use your multimeter set to ohms and measure resistance across the fuse F100 which should measure 0 ohms. Set power off.

[blackfro26]

Re: No Picture Samsung LED TV

I would use a slow blow / time delay type - the very fast acting may blow under normal in-rush currents.

Thanks for the explanation, I also have the same problem. I have a samsung models UA40F5000MA, Sound OK, and Backlight OK, but screen black no image. I suspect that there is damage in the T-Con, but I do not understand the "Test Point", I tried to measure the part of the red circle. And get the result Vin 12.85 Volt and in other parts of 6.5 volts. Can you help me. Thank you very much. Sorry but I am not fluent in English, I use google translate

[ReeceyBurger123]

Re: No Picture Samsung LED TV

Try and put the smoke back in - if you capture it all in a jar, you might be able to stuff it in the holes it leaked out of (you'll need a smoke injection kit of course; check on eBay), if not, you'll have to buy replacement Samsung smoke, but they only generally sell it to service techs so you'll have difficulty getting it.

more seriously, the lines on the screen point to a panel fault, so I'd probably scrap the set, but it would be good to check a few things first, try and locate what may have burnt or caused damage.

Haha lol thats made my day

[Mikeyboy2007]

Re: No Picture Samsung LED TV

Replacing the T-con could be a waste of money, as you may well have a damaged panel (especially after jumpering the fuse, lots of current may have gone through the wrong paths.) Very hard to to be sure. That IC could be secondary damage or the primary cause of the fault. It's your money. I wouldn't buy one if I were you.

So i got a hold of another tv but slightly different model that just happened to have the exact same Tcon board.. i tried it in the tv and im getting full picture however i am getting 4x 1 pixel wide lines down the screen at the right hand side. Can this be repaired ?

[Mikeyboy2007]

Re: No Picture Samsung LED TV

ok i suppose its my fault... should have done what was instructed rather than jumping ahead.. thanks.

to start on another tv now i think, will be paying more attention on this one.

[tom66]

Re: No Picture Samsung LED TV

Replacing the T-con could be a waste of money, as you may well have a damaged panel (especially after jumpering the fuse, lots of current may have gone through the wrong paths.) Very hard to to be sure. That IC could be secondary damage or the primary cause of the fault. It's your money. I wouldn't buy one if I were you.

[Mikeyboy2007]

Re: No Picture Samsung LED TV

is there anything at all i can do to try and fix this ? would it even be worth replacing T-Con ?

[CapLeaker]

Re: No Picture Samsung LED TV

Should of wired a conventional fuse in using wires, Not just a wire... The magic smoke has been released now

That is why you should have looked for a short first, before just replacing the fuse with a piece of WIRE!

[tom thumb]

Re: No Picture Samsung LED TV

Try and put the smoke back in - if you capture it all in a jar, you might be able to stuff it in the holes it leaked out of (you'll need a smoke injection kit of course; check on eBay), if not, you'll have to buy replacement Samsung smoke, but they only generally sell it to service techs so you'll have difficulty getting it.

more seriously, the lines on the screen point to a panel fault, so I'd probably scrap the set, but it would be good to check a few things first, try and locate what may have burnt or caused damage.

Tom66: you made my day i love the smoke idea i had a good laugh

[Mikeyboy2007]

Re: No Picture Samsung LED TV

may have been this chip as looks burnt from underneath

[tom66]

Re: No Picture Samsung LED TV

Try and put the smoke back in - if you capture it all in a jar, you might be able to stuff it in the holes it leaked out of (you'll need a smoke injection kit of course; check on eBay), if not, you'll have to buy replacement Samsung smoke, but they only generally sell it to service techs so you'll have difficulty getting it.

more seriously, the lines on the screen point to a panel fault, so I'd probably scrap the set, but it would be good to check a few things first, try and locate what may have burnt or caused damage.

[Mikeyboy2007]

Re: No Picture Samsung LED TV

whats the next move ? possibly binning the tv now ?

[newtothis]

Re: No Picture Samsung LED TV

Should of wired a conventional fuse in using wires, Not just a wire... The magic smoke has been released now

[tom66]

Re: No Picture Samsung LED TV

Yes - you have probably damaged the T-con and you may well have destroyed the panel, and possibly the main board power circuit for the panel/T-con, or LVDS cable if the current was high.

A fuse is there as a protective device, they don't put it on there so you can just jumper it because it'll be fun to see where the smoke comes out, never, ever jumper a fuse unless you really are absolutely certain there is no fault and even then, don't jumper a fuse because nobody is perfect and a fuse is a safety device.

In future, you can use a lower-rated automotive fuse. For example a 1-2A fuse which may be used in a lighting circuit in a car could be used.

[Mikeyboy2007]

Re: No Picture Samsung LED TV

I would use a slow blow / time delay type - the very fast acting may blow under normal in-rush currents.

like these ones Tom ?

http://www.ebay.co.uk/itm/10-X-FUSE-...item3f38520ad0