Today we repaired a LG monitor that had a “no power on” problem. The cliente told us that it didn’t receive power, no lights turn on, nothing, it was basically dead. So we tried to power it up, change the power cables, etc… just to check if it wasn’t any minor issue, but we just ended up confirming all the faults, this LG 24MN33D-PZ had seen better days. Granted, this monitor is almost three years old, and does have some more than normal use on a day to day basis.
So after we disassembled the LCD, we took a lot around at the usual suspects on the Power Board, but nothing out of the ordinary, so we proceeded to check the LG MAIN PCB, which by the way is a LC31A / 26LN4500 / EAX65077403 (1.0).
Normally we start measuring all the diodes and capacitors, and these two type of componentes are normally the main culprits to most of these type of issues, and actually this time we were pretty lucky, as one of the first capacitors that we tested was giving as a short-circuit read on our Multimeter.
This little guy is a SMD mounted Ceramic Capacitor, located at C802, and all we did was take this on out with our Hot air gun and a pair of Hakko CHP 7-SA Tweezers…. Then we proceeded to solder a new one on and Voilà, all that was left to do was to test it out. Before we powered it up we tested the cap again with our multimeter and this time there was no short found.
Here is a close-up of the little guy.
Well Long story “short”… no pun intended… but we did power on the LG 24MN33D-PZ, and it turned on, giving us the pleasure of seeing that tender crisp image of a LCD that even after three years of extensive use, looks like it will probably give a few more to it’s happy client.
Thanks for reading.
Author: Hélder Santos