Need help with troubleshooting tips\ schematics -LG monitor that goes off quickly
Hi all
Does someone has the test points \ schematics for lg eax65543115 ( 22" version, lg led monitor)
Or any ideas how to troubleshoot it?
The screen turns on for like 10 seconds, then goes off ( kinda protection triggered, as it goes off like you've been pressing the power button)
, but the cpu gets hot quickly within those 10 seconds , AND STAYS HOT EVEN WHEN IT'S OFF
I'm suspecting it gets over voltage \ current and triggers some OV \ OC PROTECTION but hopefully it's not too late ( that the chip is broken)
NOTE that it's a trashpicked monitor so i don't know it's history,
but when Ive first turn it on, there were no backlight at all, then I've replaced the bulged LED capacitor, NOT SURE WHAT WAS THE FIRST issue, if the cap became swallen due to the age or due to the OVERHEATING CPU
Things that I have tried ;
Several power supplies
disconnecting the LVDS from the mainboard side
Replace the LED capacitor
Resolder some suspected cold solder joints
The replaced cap helped a bit ( backlights is now works for those 10 seconds, but not sure if the cap became swallen due to the OVERHEATING CPU or age etc
IM ASSUMING that;
it's an overvoltage \ current protection triggered, but not sure how to verifying this ( not sure which IC is the CPU step down.. - I'm guessing its ic201?
AND how much voltage the CPU'S needs -1.2v\3.3v and which components i need\ can bypass \ replace by using an external step down solution ( like which resistors\ SMD components i should remove etc)
Maybe it's even LED driver short circuit? That somehow passes current to the CPU?
I'm less suspicious about the LED driver as the CPU gets extremely hot.., but I'd like to hear your folks thoughts! ����
Any tips would be highly appreciated!! ��
Thanks!
Does someone has the test points \ schematics for lg eax65543115 ( 22" version, lg led monitor)
Or any ideas how to troubleshoot it?
The screen turns on for like 10 seconds, then goes off ( kinda protection triggered, as it goes off like you've been pressing the power button)
, but the cpu gets hot quickly within those 10 seconds , AND STAYS HOT EVEN WHEN IT'S OFF
I'm suspecting it gets over voltage \ current and triggers some OV \ OC PROTECTION but hopefully it's not too late ( that the chip is broken)
NOTE that it's a trashpicked monitor so i don't know it's history,
but when Ive first turn it on, there were no backlight at all, then I've replaced the bulged LED capacitor, NOT SURE WHAT WAS THE FIRST issue, if the cap became swallen due to the age or due to the OVERHEATING CPU
Things that I have tried ;
Several power supplies
disconnecting the LVDS from the mainboard side
Replace the LED capacitor
Resolder some suspected cold solder joints
The replaced cap helped a bit ( backlights is now works for those 10 seconds, but not sure if the cap became swallen due to the OVERHEATING CPU or age etc
IM ASSUMING that;
it's an overvoltage \ current protection triggered, but not sure how to verifying this ( not sure which IC is the CPU step down.. - I'm guessing its ic201?
AND how much voltage the CPU'S needs -1.2v\3.3v and which components i need\ can bypass \ replace by using an external step down solution ( like which resistors\ SMD components i should remove etc)
Maybe it's even LED driver short circuit? That somehow passes current to the CPU?
I'm less suspicious about the LED driver as the CPU gets extremely hot.., but I'd like to hear your folks thoughts! ����
Any tips would be highly appreciated!! ��
Thanks!
Attached Files
But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. 
I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
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