Re: LG55LS4500 picture went bye bye
It's not that I don't appreciate the help, or that $20 is nothing....it's just I don't think I can proceed any further. I was able to remove and replace a ceramic disc capacitor last year without any problem, but I don't have the precision tools or the dexterity to unsolder 2 tiny caps. Even if I managed to remove them without damaging the board, I don't think I would ever be able to solder them back in place....
Tim K
Member
Last Activity: 07-29-2019, 06:11 AM
Joined: 07-21-2019
Location: Phila, PA
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Re: LG55LS4500 picture went bye bye
At this point I don't mind spending $20 on a new T-con if that's the cause. I'd just hate to do it and that not fix things. Is there any way to rule out there being a problem on the other boards?...Leave a comment:
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Re: LG55LS4500 picture went bye bye
How confident are you that the problem lies somewhere on the T-con board? At some point I may just want to replace it for $20 rather than start unsoldering things I can barely see....Leave a comment:
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Re: LG55LS4500 picture went bye bye
When you say "remove them" what do you mean?...Leave a comment:
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Re: LG55LS4500 picture went bye bye
Sorry, I didn't even notice, but YES both VGL and VGH were actually negative values.
VGL: -6.85
VGH: - 0.77
VGH resistance to ground is 1.52
With both cables disconnected resistance was the same....Leave a comment:
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Re: LG55LS4500 picture went bye bye
Here are the voltages. Sadly, at 45 I had to find a magnifying glass to see what I was doing....
HVDD: 5.79
VDD: 11.56
VGL: 6.85
VGH: 0.77
VIN: 11.79
Vcore: 1.78
VCC: 3.25
VCC18: 1.78Leave a comment:
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Re: LG55LS4500 picture went bye bye
HVDD, VIN and VCC are particularly unclear to me.Leave a comment:
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Re: LG55LS4500 picture went bye bye
Can you confirm I have the points right? Some of them are unclear which points they are indicating. See below drawing. If I have any of them wrong please let me know.
Thanks again.
Tim...Leave a comment:
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Re: LG55LS4500 picture went bye bye
Here are some more shots. Hopefully a little clearer....Leave a comment:
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Re: LG55LS4500 picture went bye bye
Here you go. Hope it's clear enough....Leave a comment:
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Re: LG55LS4500 picture went bye bye
I read some of those threads. I tried heating the back of the chip on the MB but that had no impact. Looking for other suggestions. If I need to replace a board and its cheap enough I'll just do that.Leave a comment:
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Re: LG55LS4500 picture went bye bye
OK. I didn't see the two cables at the bottom before.
[yes, I always unplug the TV before doing anything inside it]
I disconnected one, powered up....checked the screen. right side is white, left side is black with vertical lines. unplugged. reconnected the first, disconnected the other, powered up...checked the screen. left side is white, right side is black with vertical lines....Leave a comment:
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Re: LG55LS4500 picture went bye bye
When I disconnect the white ribbons with the blue tape from the T-con and turn it on, the backlight works but the screen is blank. When the cable is connected to the t-con, the screen gets that grey/white vertical band that moves left to right across the screen (it changes position every couple of seconds).
Is this a bad T-con, and if so does it need to be replaced or are there parts available cheaper?...Leave a comment:
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Re: LG55LS4500 picture went bye bye
Here is the back panel. I assume you are referring to the two ribbons at the top...the one with the black connector and the one with the white. If BOTH are connected, I get the mostly black screen with the vertical white/grey patches that change location over time. If I disconnect either ribbon, I see the same thing for a second, then it all goes dark and a yellow LED starts flashing on the right side of that orange main board.
Thanks,
Tim...Leave a comment:
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LG55LS4500 picture went bye bye
LG55LS4500 picture started displaying dark horizontal lines (alternate picture lines were basically black). Then the next day no picture at all. Now there is basically no picture except for some vertical light gray bands that seem to move across the screen. I opened up the TV and saw no fried caps or any obvious failures. Last year (about 18mo ago) this TV POPPED and went black. I opened it up and found a fried cap. I replaced it and everything was good. This time there is no obvious cause. Backlight works fine. I checked and reset all the ribbons. Nothing. See attached photos. I'd like to fix... -
Re: New Members - please post your introductions here
Hi. Tim Here. Just like to be able to fix electronics instead of trash and replace them.Leave a comment:
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