Question about Mag Innovision LT776s 17" LCD Monitor

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RE: Replace 16v 1000uf

I have a lot of 25v 470uf caps at hand and wanted to know if it would do any harm in replacing the blown cap with this type. The pcb specifies 10v 1000uf!

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  • igi_54 May 31, 2008

    Thanks for your input, went out and bought a 25v 1000uf cap and it works again! Thanks heaps!!

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You can change the voltage rating to a higher one without compromizing the circuit. You can not lower the value however. In other words, using a 1000uF cap rated at 16V would be OK. The short answer is no, you can not use the extra caps you have unless you put 3 of them in series. (I doubt you have the space for that.)

Dan

Posted on May 29, 2008

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2 Answers

Monitor comes on then goes black


I've got a couple of these monitors that have the same problem. All the caps in the P/S except the large inverter filter (110uf/400v) are bulged. I;ve ordered all the caps - INCLUDING the one that doesn't look bad since all have been subjected to the same high heat (or are bad caps in the first place {Non standard?} so am attempting to prevent a recurring problem. Since all of them cost around $6 TOTAL (plus s/h) there's absolutely NO reason not to replace all of them. The ones in my monitors are: 1-22uf/50v, 1-100uf/400v, 1-470uf/10v,2-1000uf/10v and 3- 470uf/25v. I opted for the slightly higher voltages available when I ordered since that also helps and there's plenty of room. the 10v caps will be replaced by 16v ones, the 25v by 35v while the 50v & 400v will be the same voltage. Hope this helps somebody. Good luck and solder quick to keep the heat down.

Apr 18, 2010 | Princeton Digital VL2018W Monitor

2 Answers

I have a samsung syncmaster 740 N screen, and it's dead (the power light is on, and the screen remains black, no "no signal" indication or anything). my warranty has expired. is there anything i can do ?...


Open it up and check the caps in the power supply. Check to see if the tops of the cans are bulging. Look to see if there leakage coming from any cap. If the caps are 25v I usually replace them with 35v and use the same ufd's as the old cap. This is usually the fix for this problem, Hope this is helpful.

Dec 13, 2009 | Samsung SyncMaster 740N 17" LCD Monitor

1 Answer

931B tries to come on but shuts back off


Problem solved by changing 3 capacitors (C112, C113, C316).

Replace the 470uF 25V with a good quality low ESR type and the two 820uF 25V with 1000uF 25V low ESR types.

The 1000uF caps should be 10x20 in size, however I managed to get 13x20 caps in, but it was a bit tight.

Apr 03, 2009 | Samsung SyncMaster 931B 19" 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.

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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

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1 Answer

Nec LCD1720M


Replace the bulging caps:
C 701; 1000UF @ 35V
C 704; 1000UF @ 16V
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C727; 47UF @ 25V
C613; 10UF @ 50V

Jan 13, 2008 | BenQ FP737S-D 17" LCD Monitor

1 Answer

Viewsonic lcd problem


This is a generic symptom that could happen to any LCD monitor.
The following is a generic answer applicable to most.

The most possible causes are bad capacitors or a bad semi-conductor.

Open the unit and check to see if any of the capacitors in the power supply or other boards look domed or vented on the top.

Replace any capacitors accordingly. Use the same value capacitors. Most often, 1000uF 16V or 25V, 470uF at 16 or 25V, 220uF at 16V or 25V.

If this doesn’t solve the problem, try checking the surface-mount transistors on the inverter board that run the lights. Some times these transistors go bad and can cause the power to cycle up and down. Check the area for any cracked or overheated ceramic or mylar capacitors.

Don’t forget to check for caps on the main board. Some times these boards are overly simple and only have a couple of caps, but other times they are teaming with them.

Jan 06, 2008 | ViewSonic VX924 19" LCD Monitor

1 Answer

Veiwsonic 924x


This is a generic symptom that could happen to any LCD monitor.
The following is a generic answer applicable to most.

The most possible causes are bad capacitors or a bad semi-conductor.

Open the unit and check to see if any of the capacitors in the power supply or other boards look domed or vented on the top.

Replace any capacitors accordingly. Use the same value capacitors. Most often, 1000uF 16V or 25V, 470uF at 16 or 25V, 220uF at 16V or 25V.

If this doesn’t solve the problem, try checking the surface-mount transistors on the inverter board that run the lights. Some times these transistors go bad and can cause the power to cycle up and down. Check the area for any cracked or overheated ceramic or mylar capacitors.

Don’t forget to check for caps on the main board. Some times these boards are overly simple and only have a couple of caps, but other times they are teaming with them.

Dec 27, 2007 | ViewSonic VX924 19" LCD Monitor

1 Answer

All lights work but powers on and off.


This is a generic symptom that could happen to any LCD monitor.
The following is a generic answer applicable to most.

The most possible causes are bad capacitors or a bad semi-conductor.

Open the unit and check to see if any of the capacitors in the power supply or other boards look domed or vented on the top.

Replace any capacitors accordingly. Use the same value capacitors. Most often, 1000uF 16V or 25V, 470uF at 16 or 25V, 220uF at 16V or 25V.

If this doesn’t solve the problem, try checking the surface-mount transistors on the inverter board that run the lights. Some times these transistors go bad and can cause the power to cycle up and down. Check the area for any cracked or overheated ceramic or mylar capacitors.

Don’t forget to check for caps on the main board. Some times these boards are overly simple and only have a couple of caps, but other times they are teaming with them.

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4 Answers

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I fixed my AL2021 by replacing the output caps on the power board. $4 repair. Pull the thing apart and replace the 1000uF, 680uF and 470uF caps on the end of the power board.

Jul 10, 2006 | Acer AL2032WD 20" Flat Panel LCD Monitor

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