Saturday, November 15, 2025

Samsung Syncmaster 2253BW Repairs

 Debbie walked through the shack and noticed that one of the computers was offline. After a bit of testing, I found it was the monitor that had failed. I sub'd it with a smaller spare, and hauled it out to the workshop and onto the workbench. What I found was surprising...

After disassembly, I noticed several of the electrolytic caps' tops were bulging. Some had leaked electrolyte onto the pcb. No fuses were blown, the power supply had simply shut down. I began removing and testing caps. All but 1 of the 820uF caps tested less than 17uF, the 1000uF caps were 10uF or less! I continued removing and replacing caps, and all were either way below spec or open! I don't know how this thing had operated as long as it did... 

I replaced all of the electrolytic caps, and reassembled the monitor. It's back in the shack and running like new on Debbie's computer. Here's a few pics...

After repairs, she's as good as new!

Syncmaster 2253BW...

Once the base was unplugged, the back was carefully pryed away from the front trim ring... no screws.


I unplugged these 3 cables... a wire broke on the smaller plug (near my thumb). I had to trim some of the plastic and solder it to the tiny connector inside...



This 820uF cap tested open... The next only measured 17.7uF!



Here's the main board, completely recapped...

There was only 10 caps on the main board, as opposed to over 100 in some ham radios I recap...

Bulging and leaking tops...

Leaking bottoms...

...and more bulging and leaking tops.

It booted right up and began looking for a signal!

Ready to leave the workbench and go back to studio A!