Need help to solve some problems with this laptop.
After working in bed with it one night and heating up too much (probably the cause of this problems) the sata HDD OS windows froze
After restart the original Sata HDD was not recognized anymore (but works fine in other laptops or PCs)
Tried connecting other good Sata 2.5 HDDs but not one is working in this laptop anymore (not the original nor others)
Before this had happened I observed some other problems:
When I tried replacing original mecanical HDD with a SSD HDD could not get them...
clabr
Member
Last Activity: 05-09-2022, 04:39 AM
Joined: 09-14-2019
Location: Baia Mare
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Lenovo 11e problems (any sata hdds are not recognized, sleep battery drain)
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Re: Yoga 11e (DA0LI5MB6H0 rev: h) schematic request.
Take a look here
[url]https://www.badcaps.net/forum/showthread.php?p=1087993[/url]
I just posted itRe: Yoga 11e (DA0LI5MB6H0 rev: h) sc...just posted itRe: Yoga 11e (DA0LI5MB6H0 rev: h) schematic request.
Take a look here
[url]https://www.badcaps.net/forum/showthread.php?p=1087993[/url]
I just posted it... -
Schematic & Boardview for Lenovo Yoga 11e motherboard DA0LI5MB6H0 Quanta LI5
Lenovo Yoga 11e
motherboard DA0LI5MB6H0 Quanta LI5
Schematic & Boardview... -
Re: LG 42LW5500 strange problem
Thanks for the answer.
Ok, I will look but I am also looking from answers in here to understand what is better and normal
On youtube I could posibly find maybe untrue unreal even stupid things.
Also found here in forum a post [url]https://www.badcaps.net/forum/showthread.php?t=68717&p=817319[/url]
where someone was saying to heat at 350C ? (exactly for this bga chip)
What is that about?Re: LG 42LW5500 strange problem<br /.../> Ok, I will...Leave a comment:
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Re: LG 42LW5500 strange problem
The ebay seller (store) was kind enough to refund the money and leave me the mainboard as well.
Now the question is what should I do in order to try and repair this problem (if it could be repaired)
These motherboards have a common CPU connection problem (no video, no backlight or still startup image) that usualy is solved with heat gun or in the oven (from what I've seen on internet)
I suspect this could also come from bad connections of CPU or the other BGA, and I would try and heat them.
CPU...Leave a comment:
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Re: LG 42LW5500 strange problem
I did the panel test like it's specified in this ebook [url]https://cdn.badcaps-static.com/pdfs/dabcdf99bc649ce1b1dca1d6ef3fc97d.pdf[/url]
jumped 12V and 3.3V on pin 44 (CN1 - lvds connector with 51pins)
red green blue white black pattern are ok
so the panel is ok.
Measured Tcon 6870c-0358a voltages
()
they are all how they should be. (28v, -5v, etc)
1 voltage varies, but only when LVDs are conected , from 1.6v to almost 3v
So, it's not the panel or the T-con.
It's the mainboard....Leave a comment:
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Re: LG 42LW5500 strange problem
Yes, I tried that today.
The voltage is constant when the panel is disconnected from tcon.
When connected, it's interesting that it varies, it gets higher exactly when the picture on screen is steady (you can distinguish a picture, as you could see in the video from time to time, for 1,2 seconds)
Should I suspect the panel? from that short on the initial mainboard (the one I've changed).
I don't want to make the ebay seller think it's his fault* if it's not.But if it's the...Leave a comment:
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Re: LG 42LW5500 strange problem
Just making sure it is nothing on my side, before sending the motherboard back
I am trying to understand if this kind of problem could be anything else related other than the mainboard (panel maybe)
Because on my previous mainboard after I tryied heating the main BGA (CPU) a second time, it made a short (burned power controller)
I don't know if that could have afected anything else on other boards (panel , tcon - have changed it though, power source)
There are non steady...Leave a comment:
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Re: LG 42LW5500 strange problem
I have found similar looking problems on youtube
here [url]https://www.youtube.com/watch?v=04s8c11xJyY[/url]
it sais it resolved with baking mainboard in oven
and here [url]https://youtu.be/IN2yuzmjHxw[/url]
this looks very similar with my problem (i guess my tv image is with more noise, from the start)
but there are no comments here
Could it be the BGAs (cpu, and another chip that lvds signal enter in it) from the mainboard that could produce this problem ?
Or is it incompatible panel ?...Leave a comment:
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Re: LG 42LW5500 strange problem
It is in fact a 42LW5500-ZE LG Tv (I didn't mention that exactly)
And the mainboards old and new (EAX, EBT numbers) are exactly the same.
It is how I have searched ebay for it (using those numbers)...Leave a comment:
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Re: LG 42LW5500 strange problem
The stickers, serial numbers, etc are all exactly the same.
I know this mainboards are used in 32,42,47 maybe even 55'' inch LGs
but the ebay seller speciefed is from a 42LW5500 TV.
Tcon as I have said I have replaced. And still the same problem.
A couple of Voltages on Tcon are not stable (with the replaced one as well).
I don't know if that is normal.
There are 2 LVDs cables from mainboard To tcon.
One has 51 connectors and the other one has 41....Leave a comment:
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Re: LG 42LW5500 strange problem
Yes I did try setting to 8 bit.
it doesn't change things in better. Just a more unclear, green look
It almost made it imposible to distinguish something (and I mean when the picture is steady from power on, cause otherwise you can't do anything).
These are the options for panel type or where else should I look?...Leave a comment:
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Re: LG 42LW5500 strange problem
Where should I try change Panel Type? In what Options?
In the first attached picture I am in Tool Options 1, In EZAdjust
I guess that is where I could change panel size, model LW LV etc, and bit type
And it is set correctly....Leave a comment:
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LG 42LW5500 strange problem
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... -
Re: Sony LD-65X850-8c vertical lines on display problem
I am hoping those lines are in short outside of the COF on the opposite side touching by some residue left by the other COF I had removed.
But I understand it could very well be something inside the remaining COF determined by the problems the other COF had.
But I will see.Leave a comment:
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Re: Sony LD-65X850-8c vertical lines on display problem
I obviously don't/didn't know much about the internals of the gate driver chips. Today I took some time to learn about their composition (shift register, level shifter, buffer).
I assumed if one is in short, the gate driver is broken and that is it (it will not function at all). And It will not control the opening of any of the 216 lines connected to the chip (this is a 4k, 10 side cof, thus 2160/10 lines).
I didn't think that the gate driver could still function if there is a short on some of...Leave a comment:
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Re: Sony LD-65X850-8c vertical lines on display problem
Yes budwich, seems like a good explanation, one that I briefly taught of aswell.
Mainly because I have observed (I didn't mention it yet) that the opposite side COF (to the one in short) is a bit hotter than the others (40-50gr; all others are cool 20-30gr).
But how do you explain then, that this horizontal line was present all the time, even when I disconnected the the left and the right "U" ribbons from the source PCBs?
1st attachment - left side COFs active - line is...Leave a comment:
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Re: Sony LD-65X850-8c vertical lines on display problem
As I said, I finally decided to remove the problem COF (and all the side COFs afterward)
The display has a problem still:
A horizontal line (a pretty thin line from normal viewing distance (I guess 4,5 real liquid crystal lines in reality; 4k Tv))
It is from edge to edge (in the sense it doesn't fade away at all).
It changes colors interestingly:
it gets it colors somehow from the adjacent lines
it has different colors from edge to edge (not just one solid color...Leave a comment:
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Re: Sony LD-65X850-8c vertical lines on display problem
Yes I know, many have done it with success.
I meant to post some of my findings changes of the display after removing one side of the COFs (brightness sharpness loss etc)
There is also a problem, a not so thin horizontal line left in the display that was before and is now aswell (i guess 4,5 real LCD lines) that I hope I could get rid of.
and maybe gain more info about the role of double sided gate drivers (how are they used)...Last edited by clabr; 11-18-2019, 05:52 AM.Leave a comment:
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Re: Sony LD-65X850-8c vertical lines on display problem
I know about the COF peal of method, and about the tape cut out method which I didn't find it feasible in my case, but that is probably because I didn't know enough about it.
I really wanted to go with the method of cutting the lines that go from the buffer PCB boards to the left side gate drivers, if just somebody had pointed me out which exactly do I need to cut for this particular AUO chip TV.
As I've said the problem seemed to be and indeed was one of the COFs on the left side that...Last edited by clabr; 11-18-2019, 03:54 AM.Leave a comment:
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