I Bought 4 BROKEN Monitors - Let's Try to Fix Them!

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I Bought 4 BROKEN Monitors - Let's Try to Fix Them! I bought four broken computer monitors to see if I could figure out how to fix them. I don't really have much experience fixing monitors so these repairs will take a lot of trial and error and experimenting to figure out what's wrong and how to fix it... if it's even fixable or worth fixing.

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[rsn]

14:20 The 53 volts is generated by the chip you replaced by switching the MOSFET on the output pin 7 on and off really fast (switching from 0 to 5v to 0 to 5v etc..). It is a boost controller chip for sure. If it will power some of the LED channels but not all of them at once then I would check the current sense resistor that is connected to pin 6 (CS) and labeled as Rcs in the datasheet schematic. Rcs should be a pretty low value as shown in the datasheet so it might be difficult to measure being 0.15 ohms. If that resistor burns up or increases in value it might show those exact symptoms. Other things to check are the more obvious things like the capacitors on the output side (22uF in the datasheet) and the resistors in the feedback circuit. If the caps start shorting at higher frequencies from losing too much electrolyte then the current sense might see too much current and start to lower the output voltages. Most suspect would be the caps and the current sensing resistor Rcs, though...

[FrugalRepair]

Great video and repair as always! For that last TV with the backlight issue, my first suspicion is usually a bad led(s). The short wouldn't be bad enough to take down the LED strips on the one side but when combined with the load from the other side, there is too much current draw and the driver circuitry shuts down. You could use an LED backlight tester to see the current draw (for ease) and/or you can expose the backlight and potentially see which LEDs have an issue. If it's not obvious at first, you can film in slo-mo on your phone when you turn on the backlight and then replay it for come clues.

[highroyds]

I would never call a ‘no fix’ video as boring, as it’s always experience

[rsn]

2:34 It really looked like a cold solder joint on that first chip you put in. That same pin that burned up on the bad original chip didn't seem to get solder to flow on to get a good connection on the new chip.

[wiimaster]

I must say, while your other console repair videos are fun too, I tend to like these just a little bit better because while you generally know the common issues with the consoles and where to look, when working on this stuff that you aren't really as familiar with, we get to see more of the general diagnostic process which I find really cool.

[PrototypeOnyx]

Who puts a plastic shipping label pouch strait onto a monitor like that? Some people's

[ThePennineWanderer]

This guy is amazing. He saves actually decent monitors from landfill which doesnt seem like much but it is actually amazing

[tamoghnapal]

I had an issue with the same chip as monitor 2, but in my case, the bad chip also caused significant burned traces in the PCB.. Although I was able to manually wire all pins, but the board was so broken that ultimately I decided to replace the PCB itself with a new one ( You can get them for 30 bucks ), and it even added an HDMI output to my monitor.. Still using that monitor to this day, works great..

Edit : The Monitor was LG 20 Inch 900p

[thedeathengineer]

Even if the board is dead, the screen can be salvaged and be connected to a different screen driver - about 25 bucks to a driver. I made several new screens this way.

[ivarbanovv]

For the 1st one - I think you missed the part where some cleaning up is made with solder wick and then put on some fresh solder. I do the same mistake every once in a while - thus the cold solder joint. For the 3rd one - 99% sure, one of the LEDs is dead, so you don't even have to replace the whole strip. Just find a matching LED and put that on the existing strip -> cheap, but time consuming fix. Take your time with led panel disassembly.

[mercuraz]

This is the kind of work I've been doing at the farming electronics company I'm working at and it's so much fun being able to find and diagnose any problems with datasheets!

[videogamefreak]

On these cheaper monitors, it’s really not worth it to buy a new screen, but my friend bought a high end 1440p 180hz monitor with screen damage for next to nothing, and replaced the screen. All in all, the unit works perfectly for a fraction of what it would’ve cost new. Your mileage may vary though

[filenotfound__]

Take the flashlight up against the screen to see if there is any picture.
BTW, the LEDs could be dead (judging by them flash when the monitor switches on and the voltage slovly dropping). The chip turns on detects no load/overvoltage on the output and shuts down.
The high voltage is likely produced in theese big inductors on the top of the PCB.

[Burys]

To the last monitor... I think that this power board is OK. The problem could be the backlight itself. Disassembly the panel and check the LED strings. This is constant current source. If one or more LEDs is shorted the backlight can works normally, but there can also be a voltage measurement and protection on too low voltage. If there is an open circuit the backlight can't working. This problem is easily fixable by change all LED strips with new one.

[ShoelessJP]

These repair videos are so satisfying, as well as the fact you're saving capable devices from landfill.

[downesg]

The backlight LED circuit is the boost converter which is on the right side of the board where the inductor, diode and bulk caps are. It will generate the voltage you need to satisfy the forward voltage requirements for the LED strings in the LCD. If you find the datasheet for it you can browse the reference schematic and use it for clues on how to debug the circuit.

[idx]

I think one of the backlight LEDs is faulty. By disconnecting the backlight part with the faulty LED, that part works. With the faulty LED strip connected, a current limiter kicks in and shuts down as a protection mechanism.
Replacing a backlight LED strip is hard, the LCD panel needs to come apart.

[nohandle]

On the last monitor, just as a pretest, i would have disconnected the backlight LEDs and then put a flashlight up close to the front of the screen just to see if the picture LEDs were working properly. If both sets of LEDs were bad, then i would say it's a no fix ;)

[qlum]

For the unfixable monitor, maybe a very dumb suggestion but here I go anyway:
Could it be that the problem is not with the monitor but rather with the power supply. If the one you are using somehow got mixed up and simply does not provide enough current, that could explain the issue. Possibly even if it's faulty.

[rambojazdude]

Just for future reference, it might be worth using olive oil. It's good at removing adhesives and not corrosive to the screen. Can clean it off with soap and water after.