Question about Computer Monitors
Here is additional info requested, the hardest part is cracking open the monitor case. Prior to working on this you should check to be sure the capacitors are discharged. A good way to do this is to connect a 12V light bulb across the terminals and when it goes out the cap is dicharged. You can also have a look at this page ( http://ezinearticles.com/?The-Right-Way-To-Discharge-Capacitor-In-Switch-Mode-Power-Supplies&id=64778 )
Cap Xon, 1000 uf 10V, KF 105 deg C, P602 vent
(3) capacitors identified on the board as: C822, C823, C824
They are the 3 right above where the multi color wiring harness plugs into pwr supply board shown in lower right of pic.
Posted on Nov 23, 2008
I confirm that replacing the 3 capacitors mentioned with Radio Shack (1000uf 35V) worked perfectly for me in my HP vs19e. Thanks everyone for the guidance!
For others information, my board looked completely different, and I had to actually remove the board entirely to replace the capacitors.
Posted on Mar 20, 2010
Hi that was great info,I replaced the same three 1000 uf 10V capacitors and the monitor works fine,all three imploded and bulged ant the top.
Posted on Dec 29, 2008
Tips for a great answer:
Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
Please leave rating if it helps.
Feb 26, 2011 | BenQ G2420HD 24" LCD Monitor
Sounds like some bad
capacitors, probably on the power board. I've had similar problems
with a Dell 17" monitor, a 42" plasma tv and a 37" LED
LCD tv, all now fixed and working properly.
If it's under warranty then send it back to be fixed. If not then you have two options.
1. Pay a tv repairman or similar to fix it for you. Probably the most expensive option.
2. You could remove/replace them yourself if you're handy with electronics, or know someone who is. All you need is a soldering iron and a screwdriver. The capacitors themselves are quite cheap and easy to replace
They should look something like this:
As you should be able to see, the one on the left is bulging. The blue stripe with the arrow tells you that the lead on that side is the negative, the positive lead should also be longer than the negative one.
1. Soldering iron.
2. Solder - not acid core
3. Phillips screwdriver
4. Flat head screwdriver
1. Unplug monitor and open case.
2. Identify power board, it should have a lot of electrolytic caps on there and obviously should be connected to where the power lead is attached.
3. Identify the bad caps, they should be bulging and/or leaking, although not always. Note down the three values for each cap (eg 220uf, 16v, 105c) and their approximate dimensions, and get new ones, preferably Rubicon or Panasonic, the link below will help you chose some good ones. If in doubt you could remove them and take them to the shop, but you'll have to remember where each one goes and which way round it was (take a pic).
4. Very carefully heat up the contacts on one side with the soldering iron, and rock the cap the other way, then do the other side, keep doing this until the cap comes out.
4. Replace with new cap, making sure that you observe the polarity and make sure it's securely seated and soldered in. Make sure the solder is neat, tidy and doesn't contact anything else. If there's any solder left in the holes then you'll have to heat it up or remove it before you can get the new cap's leads through. Once done properly trim the leads off so they won't cause any problems.
5. Replace casing and test. If it doesn't work then you'll have been a bit messy with the solder, tidy it up and try it again.
Here's some links to help you:
Bad caps faq - should have pretty much everything you need to know.
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