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LCD Inverters
#1
Matt²
Matt²
So last week I tore apart 3 identical 19" Gateway LCD monitors. inside the first one I was looking for blown capacitors (none of them would even turn on) .. in the first one I found none. It was difficult enough with the first one to get open that I took a break from continuing after the plastic case chomped down on my finger - YEOWCH! ..stitches not required this time, yay! - ..and I found no blown caps on the first one so I put it away.. but after a couple days curiosity kept bugging me so I tore the second one apart - blown caps! YEAY! Something to fix.. so I got replacement caps in, powered it up and once it lit up I discovered huge breaks in the lcd..rats. Tore open the third one and transplanted the screen over to the working cap power supply.. this one looked like someone had set a heavy crt monitor ON the screen... one, two, three round circles of black on the screen where it was broken. (SIGH) .. in the meantime I had sat and taken apart the 1st monitor piece by piece 'cause it's something I hadn't gotten to do before. BTW, not all the backlights worked.. at least not at first.. I then took the black part of the lcd screen from the first one, and carefully transplanted it onto one of the screens that had working backlights.. walah! Worked, and perfect screen!
Guess which one I took home?
So now I took one of the other units that had a broken screen but would power up.. took out the screen and left the inverter plugs exposed so you can plug in other backlights or other lcd screens to test their backlights. I have two of the backlights taped in and the circuit board covered so it won't shock me. So using this method, I have been able to find that a bunch of lcd screens I thought were dead do work, or at least, their backlights work.
Which brings me to today's longwinded point...
I've been working on a Compaq Presario C500 for about 3 weeks now..it was dead so it's been donated, so it's just a pet project I'm doing trying to revive it. at some point there must have been a massive power surge because this computer and another lcd monitor (which I already repaired) were apparently blown out by it at the same time. On this laptop I've replaced the motherboard (old one would power up but nothing else - no video, no post) the memory, the lcd data cable, and the power cord inside the unit for the dc jack, and now 2 inverters. It's putting out a video feed, I can dimly see the picture on the lcd monitor itself. But it won't light up. I'm frustrated that with 2 inverters with a certain Ebayer, I've yet to be able to get it to light up. With my tester, I know the screen itself works, I've just been unable to get power to the backlight through the laptop itself.
(instead of my tester) ... yesterday with the 2nd inverter plugged in, it still wouldn't power up.. I didn't have it mounted to the screen, so I turned it off to properly mount it. When it touched the screen edge (the metal mounting plate) it arced. The computer was off but plugged in. I checked ALL my connections (even took the whole thing all the way apart again) to make SURE there weren't any crossed connections - none. The inverter never worked before or after that.. I'm going for a 3rd one from a different supplier, so I hope 3rd time is a charm.
Anyone with more or similar experiences working with LCD screens?
Guess which one I took home?
So now I took one of the other units that had a broken screen but would power up.. took out the screen and left the inverter plugs exposed so you can plug in other backlights or other lcd screens to test their backlights. I have two of the backlights taped in and the circuit board covered so it won't shock me. So using this method, I have been able to find that a bunch of lcd screens I thought were dead do work, or at least, their backlights work.
Which brings me to today's longwinded point...
I've been working on a Compaq Presario C500 for about 3 weeks now..it was dead so it's been donated, so it's just a pet project I'm doing trying to revive it. at some point there must have been a massive power surge because this computer and another lcd monitor (which I already repaired) were apparently blown out by it at the same time. On this laptop I've replaced the motherboard (old one would power up but nothing else - no video, no post) the memory, the lcd data cable, and the power cord inside the unit for the dc jack, and now 2 inverters. It's putting out a video feed, I can dimly see the picture on the lcd monitor itself. But it won't light up. I'm frustrated that with 2 inverters with a certain Ebayer, I've yet to be able to get it to light up. With my tester, I know the screen itself works, I've just been unable to get power to the backlight through the laptop itself.
(instead of my tester) ... yesterday with the 2nd inverter plugged in, it still wouldn't power up.. I didn't have it mounted to the screen, so I turned it off to properly mount it. When it touched the screen edge (the metal mounting plate) it arced. The computer was off but plugged in. I checked ALL my connections (even took the whole thing all the way apart again) to make SURE there weren't any crossed connections - none. The inverter never worked before or after that.. I'm going for a 3rd one from a different supplier, so I hope 3rd time is a charm. Anyone with more or similar experiences working with LCD screens?
#2
Matt²
Matt²
#3
GasBandit
GasBandit
#4
Necronic
Necronic