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DIY – TFT monitor repair

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Hi. Many people have piles of non-working hardware which can still be restored by poking it with a soldering iron. I want to tell you how you can sometimes revive a monitor without any special training.
Beware! 23 pics under the cat! (compressed to ~1.5Mb)

Background

I love technology very much. You could say I have a fetishism syndrome in this area. I can’t say where I got this feeling from.
Sometimes I am asked to help fix a computer for all sorts of reasons: "doesn’t turn on", "glitches", "doesn’t work", "crashes" – this is my favorite expression), "broke", "doesn’t want to play", etc. I’m happy to take on a job, even if it doesn’t involve any payment or reward. I’m just curious.
So recently a friend came to me and asked me to fix his computer. I did my best and fixed it. As a reward he gave me his non-working monitor, which at one time bought and chose him, too, I.
Well, I took the gift, put it on the floor near the heating radiator and forgot about it. Whether much or little time had passed, I don’t know. Meanwhile, in the next room lived a friend, a photographer. He used a netbook with a small screen diagonal. Today he bought an excellent Nikon D300s and every five minutes he comes to me to look at a fresh, elegant picture on my monitor. That was just the impetus to look in the middle of a non-working monitor to fit it to my netbook.

The monitor is like a monitor, but does not work

Subject : LG Flatron L1735TR TFT monitor
Symptoms : does not turn on, no signal, no light is on.
What happened : Turned off and won’t turn on.
Preliminary diagnosis : deceased.
So, "a broken monitor looks just like a new one."
DIY - TFT monitor repair
I recommend removing the stand for comfortable operation
DIY - TFT monitor repair
This is how it comes off on this monitor
DIY - TFT monitor repair
DIY - TFT monitor repair
The next step is to gently unscrew the front panel
DIY - TFT monitor repair
and put it aside.
DIY - TFT monitor repair
Unscrewing some bolts
DIY - TFT monitor repair
Gently lifting the lid
DIY - TFT monitor repair
Unhook the cable from the control panel so that the cover doesn’t dangle and disturb us on the table
DIY - TFT monitor repair
Got to the stuffing by removing all the kitai plastic
DIY - TFT monitor repair
Carefully lift the box (on some models it is securely bolted down, in my case there was a mile of duct tape)
DIY - TFT monitor repair
And then the heat went on! pull all the wires left and right. But remember. I recommend pulling the matrix loop first.
DIY - TFT monitor repair
The next best thing is to unclip the backlight. The main thing there is not to mix it up later. The pins are all similar. It’s better to take a picture.
DIY - TFT monitor repair
Next we unscrew the monitor power supply board from the platform.
DIY - TFT monitor repair
Starting to look for something suspicious
DIY - TFT monitor repair
And we find it !!!111
DIY - TFT monitor repair
Detect the pregnant capacitor and unsolder it
DIY - TFT monitor repair
I need to find a part like this with parameters in my case 16V 1000µF and 105 degrees
DIY - TFT monitor repair
For lack of stock of such junk, I found an ancient computer PSU and soldered out a similar capacitor. It is only slightly similar, I recommend you don’t do that.. To increase the likelihood of a successful ending, find the "right" capacitor at the radio market.
DIY - TFT monitor repair
Find the capacitor unit and look for the right one
DIY - TFT monitor repair
Take the capacitor and soldering iron and solder it into place. WARNING!!! observe the polarity. If you are careful when soldering, you will see how all capacitors are soldered, + to +, – to – . I chose a 2000μF and 10V capacitor. Slightly different, but not critical. We get the "fixed" PSU from the monitor
DIY - TFT monitor repair
That’s it! Now put everything together neatly. Just like disassembly, only in reverse order. Slide the PSU onto the platform and screw it on. Then connect all the cables: matrix cable, power cable, backlight. Then we secure the box to the matrix platform and assemble everything into the plastic cover on the hot tracks.
I was genuinely pleased when I saw that the light bulb came on when the power was applied from the mains
DIY - TFT monitor repair
And here he is in absolutely working shape in the working position
DIY - TFT monitor repair

Result

The photo report is too detailed. But I’m sure there are people who never looked into monitor and will watch it with interest. I also want to note that not every monitor can be repaired by rewiring the capacitors. There are a lot of breakdowns. This is only 50% of what happens with monitors. So don’t feel bad if yours can’t be resurrected.
Thank you.
UPD1: at least 9 monitors have been back in operation since the article was published (30 hours)!

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