Question about Mag Innovision LT976S 19" Flat Panel LCD Monitor

1 Answer

David8 - Capacitor change was perfect solution

David8 - Great solution, I did exactly as you stated, right down to the 470uF, 35V 85C caps from Radio Shack. I changed all 6 caps and the monitor now works like a charm. I saved $190 I didn't want to spend right now. The fix took about an hour total, from opening the monitor to turning it back on.
My question is, what capacitor life expectancy should I expect to see by going to a higher voltage rating, but a lower temperature rating?

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 2 Answers

I'm not a 100% sure on how long it will last you, but I doubt your monitor will go over 185F degrees even while running all day and since it's a higher voltage it wont get blown as easily. I only changed mine a few weeks ago, but some other guy who did the same said he's has been working for like a year now without any problems. I think they'll last longer than the originals.

Posted on Jul 09, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Had the blank screen problem. Now it won't work above 800x600 res


When I replace caps in this model, I replaced all the caps (4 (1000uF by the heat sink, 1 (470uF) by the inverter transformer) for the 5v and the 12v since you cannot 100% relying on just by looking bulging tops. I am not sure why your has 3-470uf. See my example here: http://s807.photobucket.com/albums/yy352/budm/Princeton%20VL2018W/

Jan 23, 2010 | Princeton Digital VL2018W Monitor

5 Answers

I have a Samsung Syncmaster 932b LCD monitor. When I turn it on, the screen just flashes on and off, as does the blue light around the power button. I read up online and found that the capacitors on the...


savato321, Most black screen lcd monitor owners don't have the smarts to open up their monitors to do a VISUAL inspection of the "switch-mode-power-supply/inverter supply!!!! You're good. Now you will need to know some stuff about electrolytic filter capacitors! First, the "uf" or "UF" means micro-farad! It is just a rating given to express the storage capacity of the device. Next is the voltage rating. A 16v rating means that the capacitor should never be placed in a circuit where the voltage will exceed 10 to 12 volts DC. Your 820 uf cap rated at 25volts will most likely be in a 12 to 18volt dc circuit. Now for temperature rating. All caps have a maximum temp rating. Most clock radios, stereos, will use 85 degree centegrade rated caps. Printers,PCs,monitors, will use 105 degree C rated capacitors. Never replace with lower specification units! You can GO up but never DOWN. If 1000uf 25v is all you can get it's OK. If you can get 820uf 35v units and they are not too big and they will fit on the board sure you can use them. I would stick with the OEM design voltage rating. Electrolytic CAPS are polarized!! You must replace them + to + and - to -!!! If you screw -up they will blow-up!! The wire lead closest to the printed STRIPE on the cap will be the negative and the unmarked terminal will be the positive. If you visit www.ccl-la.com/badcaps.htm you will get more info on recapping your SMPS. You can also watch some DIY videos at YOUTUBE for "lcd monitor repair" that might be helpful. Also visually inspect the SMPS/inverter printed circuit board for "COLD" FROSTY looking solder joints. They should all have near mirror finish to them. Let us know the name of the BAD CAPS you remove from your unit. You may even want to document with pics with a digital camera what you find. Well, good luck guy. 12fixlouie

Dec 24, 2009 | Samsung SyncMaster 932B LCD Monitor

2 Answers

Optiquest q20wb Screen goes blank after powering off


I had the exact same problem. The screen went black and the green light flashed. I went ahead and took the monitor apart (scary) and took a look at the power supply circuitry. I saw 6 suspicious electrolytic caps on the board. Three 470uF 25V 105 degree C caps, two 1000uF 10V 105 degree C caps, and one 470uF 10V 105 degree cap. They all appeared to be slightly bulging and one even had a small hole in the top. I decided to replace all of them. The parts cost a little more than 5 bucks. I couldn't find a 470uF 10V cap at my local store so I bought a 16 V version instead, which is fine. Anyway, after replacing all 6 caps, the monitor works as good as new.

Mar 02, 2009 | ViewSonic Optiquest Q7b Flat panel TFT 17"...

4 Answers

HPvs19e


Ken:

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 )

Spec is:
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.

John :).


3e49013.jpg

Nov 21, 2008 | Computer Monitors

1 Answer

VX924 Blown Fuse


What are the symptoms? How do you know the fuse was blown on the monitor you bought? The fuse on vx924 is soldered onto the circuit board. If you have any symptoms that require power its probably not the fuse. The back lighting on this unit has a problem. Three 25v 470uf caps on the circuit board are underrated and have a tendency to go bad. Replace them with 35v 470uf caps.

Sep 28, 2008 | ViewSonic VX924 19" LCD Monitor

1 Answer

When it's turned on, the light on my Princeton monitor blinks...


I just did this capacitor replacement today after reading these posts. It worked great! I used 470uF
35volt caps from radio shack. There are three 470uF caps two right next to each other and one off by itself on the printed circuit board. The values are easily seen on the side of the capacitors. Open the monitor by removing the screws and prying the halves apart using a large straight edge screwdriver. There is a metal cover over the printed circuit board that will come loose after removing screws around its edge. There are several wire sockets that must be unplugged to allow the circuit board to be flipped over to reveal the capacitors. The board itself is held down with three screws
Once you identify the capacitors, use a fine tipped soldering pencil to melt the solder holding the capacitors in place and remove them. Position the new caps with the dark stripe matching up to the lined marks on the board, carefully apply just enough solder to each terminal to hold the caps in place. Reassemble and you're done.

Sep 18, 2008 | Princeton Digital VL2018W Monitor

5 Answers

Can changing 3 capacitors on motherboard solve my problem?


We had a power surge and my VL2018W LCD monitor stopped working... blank screen and flashing blue light.

I carefully opened up the back and found the power board (the one the AC plug goes into). There were about 5 electrolytic capacitors that were bulging (but not ruptured). There were 3 with the values listed by the original poster (470uF @ 25V) and 2 with 1000uF @ 10V.

I scrounged a couple of 2200uF@10V caps for the last two and bought 3 470uF @ 35V caps from Radio Shack (P/N 272-1030).

Luckily, the monitor came right back up and seems to be OK. It was out of warranty, so there wasn't a big risk.

Just increasing the working voltage won't do that much for you. If any caps are bad, just replacing them with the same value is good enough, but a higher working voltage won't hurt (usually means a bigger cap).

Good luck.

Rich

May 04, 2008 | Princeton Digital VL2018W Monitor

3 Answers

MAG innovision LT917s problems


K I just fixed mine! I hope you still have your screen dude. Its easy. Take the screen apart, and take the monitor part off, open up the part thats attached to the back, and remove the big silicon peace thats attached with the golden bolts. Look at the capacitors, if they are bulged up then they are broken, go to radioshack and buy some new ones, they are 470uF 25v 105C, but 470uF 35v and 85C will work as well. Solder them off and put the new ones on, connect everything and it'll work like new. Just did it today and saved myself 200 from buying a new screen!

Mar 24, 2008 | Mag Innovision LT976S 19" Flat Panel LCD...

18 Answers

Vl1918 it poweres on and shuts off.repeat


Just another voice to say that the solution provided here by others does indeed work.

Had same symptoms: screen comes on for about a second, a metallic popping sound occurs, screen shuts off for about a second, repeat. Problem occurs even if monitor is not plugged into computer (thus isolating it to monitor). Monitor purchased from Costco approximately two years ago.

Found 3 suitable 470uF 35V capacitors at the local Radio Shack for a little over $4 (more pricy than online, but no shipping cost, so it's a wash) Entire repair took less than 30 minutes.

The repair itself is already covered pretty well by others here, so I'll just add some disassembly instructions:

Set the monitor face down on a towel to protect screen. Remove 4 Phillips screws securing base to back of monitor, set base aside. Remove 3 Phillips screws from bottom edge of monitor cover. With flat screwdriver carefully pry along the other 3 edges to disengage the catches (about 3 per edge). Remove back cover. Identify the raised metal shroud containing the power supply module at center. Carefully lift one side of each piece of foil tape to expose connectors (for the short pieces of tape it's easier to remove the side that's laying flat, for the long piece at the top of the monitor, it's easier to remove the side that's vertical on the power module). Disconnect all cables, noting how to replace them later. Remove 4 Phillips screws securing the power module. Remove the power module and set the rest of the monitor aside. Flip the power module over, orient it such that the plastic covering is on the left (done only so that these instructions make sense). Carefully pull up the plastic cover from the right circuit board near the center of the power module, you can leave it attached to the metal shroud at the left side (it is difficult to remove from the metal without damaging it). Gently bend (without crimping) the plastic back and out of the way and remove the 4 Phillips screws securing the left circuit board (the one with the power connector). You will need a small "jeweler's" screwdriver for one of the screws - make note where that screw goes (top right of circuit board, or top center of overall module, when oriented as I did). Slightly tilt the left side of the circuit board up, and slide the circuit board out and to the left, over the bent back plastic, disengaging a connector from the neighboring board.

Then perform repair, and reassemble in reverse order.

Thanks to all who posted the original solution!!

Nov 15, 2007 | Princeton Digital VL1918 Monitor

3 Answers

Replacing Capacitor on LCD Monitor


That is good advice. Always replace with same or higher voltage rating. Also make sure it is put in the right way around.

Sep 21, 2007 | Sceptre X9G Komodo IV 19" Flat Panel LCD...

Not finding what you are looking for?
Mag Innovision LT976S 19" Flat Panel LCD Monitor Logo

Related Topics:

70 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mag Innovision Computer Monitors Experts

William Miller
William Miller

Level 3 Expert

8820 Answers

Tony

Level 3 Expert

2598 Answers

Are you a Mag Innovision Computer Monitor Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...