LG LCD monitor flickering fix
LG flickering repair
How to fix LCD monitor flickering
How did I fixed LG-1970HR/HQ LG-1770HR/HQ LG-L1780U/UN LCD flickering monitor?
DISCLAIMER – Important!
My LG-1970HR monitor started to flicker on a random basis.
Searching for a fix I have learned that this fault is well known and can be linked to any of the following:
1. Power supply/adapter
2. Inverter PCB
3. LCD lamp
This monitor power supply is an external component and it is the easiest one to start with. In this guide I’ll show you how to fix the power supply that is the common cause of the flickering fault.
In order to fix this power supply we need to open it, replace some components and do some soldering work.
First check that you have unplugged the power adapter from the mains and that you have removed the AC power cord from it.
Note: this unit has capacitors in it so be very careful not to touch it to avoid getting electric shock.
7. Unsolder and remove the defective capacitors.
Replace the 2 capacitors with same type.
Pay attention to polarity! Capacitor has polarity and you should replace each one to same position on the PCB keeping same polarity. Both capacitors minus (-) pole are facing the inside of the PCB as seen on photo.
Assembly – assemble all parts in reverse order to what is listed above.
A. Return the shield PCB and solder its wire.
B. Assemble the electronics block and close the case. Start with the side with the snaps.
C. Reconnect the power cable and connect the DC connector to the monitor
Voila – start using your monitor. You have fixed your monitor’s flickering fault.
Have fun and enjoy your LCD monitor, Avi
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