Re: Bad T-Con or LCD Panel?
Thank you!...
Alex9
Member
Last Activity: 07-13-2017, 12:30 AM
Joined: 09-29-2016
Location: Hilo, Hi
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Bad T-Con or LCD Panel?
Hi, I have an Element ELEFT506 lcd TV with what I think is a bad t-con board based on this model's track record from bad user reviews, but I'm a newbie.
At one point there were a few horizontal lines at the very top of the screen but just for a few minutes. The rest of the time it looks like in the pictures I've attached. I tried fiddling with the LVDS connector with no change and also the t-con to lcd connectors/ribbons. When I disconnect the left t-con to lcd ribbon the right side works perfectly with no distortion or lines. But if I disconnect the right ribbon the left side... -
Re: TCL LED backlight voltage drop
The backlight just went out again. It happened when I connected a vga cable between it and my computer. Not sure if that's related or a coincidence.Leave a comment:
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Re: TCL LED backlight voltage drop
Sorry, I had the tv put together due to lack of working space. I just took it apart though.
strip 1 is 19.3v with 7 LEDs
strip 2 is 22v with 8 LEDs
strip 3 is 19.3v with 7 LEDs
They appear to be connected in Series.
Soooo I put it all back together and for some reason the backlight is staying on now. It's been 10 minutes already without turning off. The only thing I can think of is that I disconnected each LED strip from each other to test them individually just now and maybe reconnecting...Last edited by Alex9; 09-30-2016, 03:35 PM.Leave a comment:
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Re: TCL LED backlight voltage drop
LED tester connected to pins 5 or 6 and pins 1 or 2 all light up the board at 60v. It seems 5-6 and 1-2 are connected.
I tested pin 2 again to see if the readings match pin 1 and got these readings:
24v, .9v (with BL flash), 1.5v
The tv came on with full backlight for about 20 seconds this morning when I plugged it in.Leave a comment:
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Re: TCL LED backlight voltage drop
Every LED lit up nice and bright with the tester connected. The other way I connected it was to the connector at pins 1 and 6.
If you don't need me to open it up again please let me know. I'd be happy to do it all the same....Leave a comment:
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Re: TCL LED backlight voltage drop
P801 pin max readings before standby mode:
pin 1 mostly reads 1.1v to 1.5v
Other times I got these results:
1st test - 6.266v
2nd test (happened two seperate times) - 9.11v then shot up to 14.2v and the backlight came on for 10 seconds then went back off.
3rd test - 24v
4th test - 23.9v
5th test - 3.76v and a backlight flash
pin 2 - 3 tests - 1.1v, 1.3v, 1.5v
pin 3 - 3 tests - 1.27v, 1.29v, 1.35v
pin 4 - 3 tests...Leave a comment:
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Re: TCL LED backlight voltage drop
Forgot these....Leave a comment:
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Re: TCL LED backlight voltage drop
I did use the chasis as the gnd and red probe on P801 pin 9. At a higher DC range on the DMM, when turned on it reads a MAX of 82.9v and drops steadily down to 46v over about 8 seconds.
7 LEDs per strip. (by far the hardest answer to get
)
I'm a bit confused about this question. P801 has only 6 pins and I'm pretty sure 1 & 2 are Negative and 5 & 6 are Positive. 0vdc from pins 1 & 2 and 46v from pins 5 & 6....Leave a comment:
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Re: TCL LED backlight voltage drop
Sorry. I'll be specific
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Re: TCL LED backlight voltage drop
3.232v on both.
Attached a picture.
Also there doesn't seem to be any play at the solder joints of the black connector....Last edited by Alex9; 09-29-2016, 04:59 PM.Leave a comment:
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Re: TCL LED backlight voltage drop
Sorry I don't see any pins to black connectors that don't solder through to the back of the board
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Re: TCL LED backlight voltage drop
Ok I see the diodes now. Here are pictures of both sides of the board. The last one is my assumptions about the bridge rectifier. Thanks....Leave a comment:
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TCL LED backlight voltage drop
Hi, fixing tv's is my new hobby and I have this TCL LE32HDF3010 that turns on but has no backlight.
First I checked all the caps on the Cold side of the board cause that's one of the only things I know how to do so far lol. They're all fine to my knowledge. Then I opened up the screen so I could use my fancy new LED tester
and all the LEDs are lighting up and all 3 LED strips are wired together straight into the power board (ES282C2). I'm assuming the LED tester showing that they're running at 60v means that's how much they require. The power board is only putting out 46v whether...
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Re: New Members - please post your introductions here
Hi, My name's Alex.
I don't have an educated background, but always liked to mess with stuff. In my circle of friends and family I'm considered the "tech guy" but it's sort of a joke lol. I basically help people with viruses, reinstalling OS's helping people change their screen resolution and setting up home networks but I could do more.
What I really like is messing with hardware. I was at the local dump and I always stop by the big bins and look for cool stuff that's in reach. So there...Leave a comment:
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