Fixing ViewSonic VX2245wm 22 inch LCD Monitor.
Being prone to all kinds of fixing, I recently offered to attempt to fix my running friend Brian’s no longer working 22″ LCD (Liquid Crystal Display) monitor – no picture…
He gave it to me on the way from one of our runs and when I found time a bit later I fixed it. This is my second successful fix of LCD monitor. So, if you want to learn how to do it yourself, read on!
I. Examining device, determining the problem.
There could be different problems with LCD monitors – capacitors going bad (most common), back-lighting tube light bulbs burned, PCB board (Printed Circuit Board)problems, etc.
1. So, first thing is to turn the monitor on and check it. I was glad that indicator light on the front of LCD lit up, indicating that power circuit is most likely okay.
2. Checking the screen with bright flash light showed no picture, telling me that back-lighting tube light bulbs are most likely okay too.
3. Then, next thing to do is to disassemble the monitor and examine PCB boards and its parts. If you are not sure how to do it, search on YouTube for your model, and usually video will be there!
3.1 Base must be detached first, by removing two plastic covers and unscrewing 6 screws. Keeping track what screws came from and store them organised!
Finally, the base unit is detached. It has USB ports, mike, headphones connections etc., but I did not have a separate power supply for that, and was unable to test it. It is completely electrically separated from Monitor.
3.2 Disassembling the monitor, by first unclipping plastic trim around the perimeter of Monitor by using a patty knife and flat screwdrivers. Most nerve wrecking part, as it’s always scary to break the plastic… I noticed that someone was trying to take it apart before me and damaged the trim slightly, fortunately it’s invisible from the front.
3.3 After the trim unclipped, the back cover is removed as well.
3.4 After the covers gone it’s time to get to PCB boards by removing the metal cover.
3.5 PCB Power Supply board is disconnected and removed from monitor completely. Bulging capacitors immediately noticeable. Obvious and most common problem! Hopefully it’s the only problem. Will see.
3.6 Problem is identified – 6 failed capacitors on Power Supply board. Good thing that they did not burst and did not leak, because electrolyte inside them could damage the board! These are parts of the board that work as a batteries, holding the charge and giving it away when PCB needs it. Now they need to be replaced! There is only one (!) shop in Greenville, SC where such parts can be ordered, and it happened to be a few blocks from my house – Wholesale Industrial Electronics at 2215 Old Buncombe Rd. Greenville, SC. 29609 (Phone (864) 235-8334), or it’s possible to find parts on eBay.
4. Ordering a set of capacitors on eBay for ~ $10. Did it this way, because there was a whole set offered for the monitor with exact specifications on capacitors. Also, just in case made a schematic of location and specs of capacitors on board. Better safe than sorry! 🙂
5. Unsoldering and removing bulged capacitors from Power Supply board. I have a special unsodering iron with a suction bulb to do it easier, but regular soldering iron would work as well.
All six capacitors soldered out and now need to wait for new to be delivered.
II. Fixing the LCD problem.
6.) Soldering in new capacitors, watching to match polarity of them after eBay order delivered!
Putting in new capacitor according to specifications and polarity!
Bending the leads of new capacitor to keep it in place.
Soldering in new capacitor leads by regular soldering iron.
After soldering and checking for secure attachment, excess of leads are cut off.
Soldering in of all new capacitors completed. If you look carefully you’ll see the different soldering of my style and the factory. 🙂
All 6 new capacitors are soldered in. No more bulging! Board is ready to be returned into the monitor. Old bulging caps are on display above the board.
7.) Replacing the Power Supply board back into the Monitor and reconnecting all contacts.
Putting the metal cover of the boards back on.
7.1) Accident… Not always everything goes smoothly… One of the bolts on digital monitor connector broke… Maybe I screwed it in too tight? Need to somehow remove it and replace.
7.2) Drilling out the broken bolt on digital monitor connector. It went thru all right, forced by the drill bit to go thru the tread quickly. Feuu-u, no major repairs here, just put in the bolt from my monitor! 😎
Broken bolt removed and replaced with one from my other monitor. Must be very careful during repairs to not break something else! 🙂
8.) Quick check to see if problem is fixed! Connected the monitor to an old computer that was close by and Ураа-а-а! Monitor is working – displaying the image! Remember those “WinDoze”? 🙂
8.1) Finished reassembling the Monitor together in reversed order and reconnecting the base.
8.2) Final check of the Monitor after completed repair, by connecting it to my main computer with Linux Mint 14 (Ubuntu based) Operating System.
I let it run for a while and it works fine, but appears not very bright to me… It might be this particular model setting or something else is slowly going down? Or maybe it’s completely normal, as I just recently switched to LCD monitors.
Another thing is fixed and saved from landfill! Working fine! 🙂