Author Topic: LG LCD repair  (Read 677 times)

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Offline evancharlton

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LG LCD repair
« on: January 28, 2019, 08:58:24 pm »
Hi everyone!

We had a monitor at work that was damaged (in some unknown way; I think they dropped it?) by movers. Our IT department replaced it and the damaged one was headed for recycling, so I asked if I could have it. I figured that one way or another, I'll learn something new (or at least get to practice my SMD desoldering!)

I've attached a picture of what it looks like when I plug it in. The image is trying to be there, but there are flickering horizontal stripes going on.

I popped off the case and re-seated the ribbon cables -- no change. Where should I begin looking? Is this probably fatal (or at least impractical to fix)?

Details:
Panel: LM240WUA
Monitor: FlexScan EV2455

Thanks!
« Last Edit: January 28, 2019, 09:01:54 pm by evancharlton »
 

Offline shakalnokturn

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Re: LG LCD repair
« Reply #1 on: January 28, 2019, 09:30:57 pm »
I'm having a little trouble telling from your photo but it actually looks as if the screen is cracked at the top of the red vertical column, If that's the case there is not much you can do other than replace the screen.
 

Offline alienozi

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Re: LG LCD repair
« Reply #2 on: January 28, 2019, 09:32:04 pm »
I might have several suggestions based on my previous work from different LCD monitors
  • Check the ribbon cables and its' connectors maybe pins are damaged
  • Check the capacitors
  • monitor driver board has lots of tiny connections maybe several of them are damaged to form a line
Oguz Alp Duran
 

Offline cdev

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Re: LG LCD repair
« Reply #3 on: January 28, 2019, 09:33:32 pm »
(If you have the means of removing them) there are probably a lot of useful parts in it even if it does turn out the screen is cracked. But SMD parts require reworking equipment, a hot air gun - at the minimum- to remove them.  Depending on your personal bench gear, it could be more trouble than its worth.

To give an example of what kinds of parts might be found, LCD TVs that use LEDs for their backlighting often have a substantial number of unique large bright power LEDs in them.
« Last Edit: January 28, 2019, 10:17:29 pm by cdev »
"What the large print giveth, the small print taketh away."
 

Offline wraper

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Re: LG LCD repair
« Reply #4 on: January 28, 2019, 09:58:04 pm »
It's trash. LCD panel is certainly dead. Take out PCBs and dispose the rest.
 

Offline shakalnokturn

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Re: LG LCD repair
« Reply #5 on: January 28, 2019, 10:55:16 pm »
...But SMD parts require reworking equipment, a hot air gun - at the minimum- to remove them.  Depending on your personal bench gear...

  ;D  Although it isn't gun shaped and nothing proves it is his own, it looks like a hot air rework station in that photo if you ask me.  ;)
 

Offline cdev

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Re: LG LCD repair
« Reply #6 on: January 28, 2019, 11:24:54 pm »
Indeed it does, I'm sorry, I really should have noticed that!
"What the large print giveth, the small print taketh away."
 


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