Hello everyone,
I have bought a replacement mainboard (used state) from ebay for a LG 42LW5500 TV.
Previous mainboard had the typical LG problem (cpu bga soldering - no video , no backlight at startup)
Used heat gun. Worked for a month
After that stuck at startup LG logo (Found out from internet is linked to the same problem)
Heated again , but I guess I reheated wrongly (at higher degrees that I should have).
It didn't work anymore.
So, I have bought a new mainboard from ebay.
And this is how it behaves (I have attached also 2 pics)
https://streamable.com/vabveb
The seller says it could be panel incompatibility and says to change it from Service Menu
(but I haven't sent him a video, just some pictures, so I don't think he really understood how it behaves)
The problem is that the image is rarely steady and correct, so that you could distinguish things. It is only for a second and then a few more is indistinguishable.
It happens rearly to be steady constantly from startup to power off (only if I set it on HDMI input (with no signal)).
It is then when I manage to distinguish something and could enter LG Service Menu, InStart and EZAdjust (using android app) and possibly alter things.
But I don't know where to change any panel related settings (Tool options 1, attached pic, seems to be something, but it is set correctly 42 and LW55)
I also tried replacing the Tcon (bought a pretty cheap one)
(Measured a couple voltages on the Tcon, that were not constant (varied for a small amount))
But it is the same.
Where could this problem come from?
Is it the mainboard, should I send it back? or could be something else, something at my side.
With the previous mainboard at second heating some pieces fell (somewhere very small), tried soldering them back, tried the board again and made a short on lower part of the mainboard (a power controller); I don't know if that could have affected somewhere else (as I said I already tried replacing the tcon)
If anyone has any idea to give, where this problem could come from, would really appreciate it.
From my attached video you could see
When here are moments (maybe in a time pattern or depending on the content (image colors etc)) when the image is steady and also becomes better quality (as you could see at 0:43 the image quality is better than before)
Also If you look closely the image (tv source and also tried HDMI pc input) has a few good lines missing from below (horizontally) and from right (vertically); TV has 1980x1080 resolution.
Thank you.
I have bought a replacement mainboard (used state) from ebay for a LG 42LW5500 TV.
Previous mainboard had the typical LG problem (cpu bga soldering - no video , no backlight at startup)
Used heat gun. Worked for a month
After that stuck at startup LG logo (Found out from internet is linked to the same problem)
Heated again , but I guess I reheated wrongly (at higher degrees that I should have).
It didn't work anymore.
So, I have bought a new mainboard from ebay.
And this is how it behaves (I have attached also 2 pics)
https://streamable.com/vabveb
The seller says it could be panel incompatibility and says to change it from Service Menu
(but I haven't sent him a video, just some pictures, so I don't think he really understood how it behaves)
The problem is that the image is rarely steady and correct, so that you could distinguish things. It is only for a second and then a few more is indistinguishable.
It happens rearly to be steady constantly from startup to power off (only if I set it on HDMI input (with no signal)).
It is then when I manage to distinguish something and could enter LG Service Menu, InStart and EZAdjust (using android app) and possibly alter things.
But I don't know where to change any panel related settings (Tool options 1, attached pic, seems to be something, but it is set correctly 42 and LW55)
I also tried replacing the Tcon (bought a pretty cheap one)
(Measured a couple voltages on the Tcon, that were not constant (varied for a small amount))
But it is the same.
Where could this problem come from?
Is it the mainboard, should I send it back? or could be something else, something at my side.
With the previous mainboard at second heating some pieces fell (somewhere very small), tried soldering them back, tried the board again and made a short on lower part of the mainboard (a power controller); I don't know if that could have affected somewhere else (as I said I already tried replacing the tcon)
If anyone has any idea to give, where this problem could come from, would really appreciate it.
From my attached video you could see
When here are moments (maybe in a time pattern or depending on the content (image colors etc)) when the image is steady and also becomes better quality (as you could see at 0:43 the image quality is better than before)
Also If you look closely the image (tv source and also tried HDMI pc input) has a few good lines missing from below (horizontally) and from right (vertically); TV has 1980x1080 resolution.
Thank you.
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