Sceptre 47” led screen problem

[Davi.p]

Re: Sceptre 47” led screen problem

Vgl is wrong value, check it twice, if confirmed positive value you can buy a new tcon or continue to troubleshoot tcon with us.

[Georgia088]

Re: Sceptre 47” led screen problem

So the Vgl should have a negative value? If it doesn't have a negative value then the tcon is bad? Is there a way to confirm panel and main board are good?

thanks!

[budm]

Re: Sceptre 47” led screen problem

Yep, look real close at the meter to see if VGL reading has MINUS sign in front of the number to indicate NEGATIVE Voltage polarity or not as shown on your meter display or not, you must pay attention to details, wrong DATA causes problem in troubleshooting.
So is it showing NEGATIVE number?

[Georgia088]

Re: Sceptre 47” led screen problem

Ok, I will check this evening! Sorry! The other values look correct?

[Davi.p]

Re: Sceptre 47” led screen problem

All values ok apart vgl, should be about -7v.

[Georgia088]

Re: Sceptre 47” led screen problem

Ok, finally got a chance to recheck. All of the values I showed in the previous post were correct except vgl should be -4.8 instead of 4.8.

Here is what I had:
Hvdd- +8.1
Vin- +11.8
Vcc18 - + 1.6
Vdd- +16.3
Vgl- 4.8 (This is actually -4.8)
V core - + 1.6
Vgh - +27.9

Thanks again for all of your help!!!

[Davi.p]

Re: Sceptre 47” led screen problem

There could be a faulty/dirty lvds cable (tcon> mainboard) , if it is possible do the old trick of connecting a second tv through Scart an put that in av and the faulty one in dtv.

[Georgia088]

Re: Sceptre 47” led screen problem

Ok, you lost me there. I have disconnected the ribbons connected to t con/mainboard several times and reconnected. I don't have a second tv like this one. Do those voltages show that the t con/main board are good? Again thanks for all of your help!

[vinceroger69]

Re: Sceptre 47” led screen problem

if the tv what your working on has a scart socket you can some time use any other tv too see if the mainboard is ok so have a source on the faulty tv ie dvd playing, connect a scart between the two tvs what do you see on the good tv screen? you may have too switch good tv too av channel etc this test does not always work though but worth trying.

[Davi.p]

Re: Sceptre 47” led screen problem

I cannot know it but -4, 8v seems a bit low, having an external supply at -7v could reveal the faulty zone, or you can inspect for faulty capacitors on that line.

[Georgia088]

Re: Sceptre 47” led screen problem

There is no scart socket on this tv. Would the bad capacitor be more likely in the tcon board or the main board? I don’t see any bulging. Is there anything else to test or is this tv probably just toast?
Thanks!

[vinceroger69]

Re: Sceptre 47” led screen problem

if a replacement tcon is really cheap maybe worth trying another one it could be a lcd panel fault hard to say really

[Davi.p]

Re: Sceptre 47” led screen problem

I was talking about tcon tensions so the bad cap or other component is on the tcon, but i guess you are a novice user so getting a repl. tcon is a better thing for you.