Question about Princeton Digital VL2018W Monitor

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Can changing 3 capacitors on motherboard solve my problem?

I had someone suggest this solution: to change the three 470uf 25v capacitors to 50v.
Problem: I have a princeton monitor (VL2018W 20"). i bought it used. it has a 'common' problem that many of this model have; it worked PERFECTLY fine until one day when i turned it on, the monitor started flashing a blank screen, the monitor light was on though. The picture on the screen doesn't come on.
So- would changing those 3 capacitors (i'm supposing the ones associated w/ the display) solve this problem? I know nothing about computers and would just like a second opinion before my husband rips out the original capacitors. thanks SO MUCH for your time!!

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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

Posted on Jul 22, 2008

  • Rich Moore Jul 22, 2008

    sorry for the duplicate!

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I had the same problem as described on previous posts. I have a pair of these princeton monitors and both failed after about a year in exactly the same fashion. I tried replacing the three 470uf caps with 470uF 35volt caps from Radio Shack. Worked like a charm. I was unable to find 50volt rated caps locally but ordered some and will try those on my second monitor. The replacement is easy if you know how to solder. Just be sure to orient the capacitors correctly. Put one in backward and it will make a loud noise and smoke like crazy (AMHIK).

Posted on Sep 27, 2008

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As I saw somewhere by a poster that there are actually 5ea 470uF 25V electrolytic caps and indeed there are.  However, you should only need to replace 4 of them.  They are all grouped together near the heatsink that has the two TO220 Shotkey Diodes.  I did notice the top of each cap which is the safety vent is at (silver with scored cross) was bulged slightly.  The fifth cap set off on it's own did not have the bulge.  Bulge or not you should replace the set of 4 as I do believe at a 25V rating they are under rated.  The Radio Shack part number 272-1030 is only 35V and a 50V might be a better choice however I used the 35V Radio Shack caps and the monitor works well now.  The hardest issue was getting the monitor chassis out of the black plastic cabinate.  I had to remove the screws that held the front bezel (monitor face surround) in order to get the chassis out.  Do take care that there are wires also going to the front panel buttons.  Remove the chassis cover that protrudes after disconnecting the 4 cable connectors (2 left, 2 right).  The PCB where to find the caps (power supply) is the board where the AC Power Plug goes into.  My thanks to this blog as I have two of these monitors with the same issue as I'm sure many more people will be seeing this same issue as the caps breakdown over time.

Posted on Sep 19, 2008

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

Posted on Jul 22, 2008

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Fairly radical surgery.. Does he know much about electronics? If not, could be a bad idea. Have you tried attaching the monitor to another pc? Always a good test to prove where the fault is.. Might be the pc's video card. Anyway, I am starting to see a history of power supply problems on the net relating to this type of monitor.. Eg "a blown power inverter card. All five capacitors on it were blown." - So there might be something in it.. Good Luck.

Posted on May 04, 2008

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SOURCE: 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.

Posted on Sep 27, 2008

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Posted on Jan 02, 2017

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1 Answer

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Usually the capacitors are 1500uF/25V and 470uF/25V, but I suggest to use 35V capacitors. This will make your power supply to last forever. Also, you better open the monitor and see by yourself what kind are the capacitors. Mind the polarity or the capacitors will blow out with lot of smoke. You can buy them from local parts store like Conrad.com or online.

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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.

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This may be related to a power supply problem that these monitor have. I think you need to fix the power supply board inside the display itself. It's giving the logic board and backlights fluctuating power and they have weird / intermittant problems.
There is a supplier of power boards online, you can google them with numbers from the board but I don't suggest using them. Look for information on the company before you buy from them. I've seen a lot of complaints for this "international" company.


First check that you are getting a strong 12V from the external power adapter. If so, the problems may be as simple as changing out a few capacitors. (about $8 in new capacitors, plus shipping)

On the PL2010M monitors you need the following parts. I've added digikey part numbers to make life easier:

P10271-ND 220UF 25V Capacitor (3 or 4 depending on PS)
P10275-ND 470UF 25V Capacitor (1)
P10221-ND 470UF 10V Capacitor (4)

If you're not comfortable with soldering and de-soldering electronics, take it to a local technician for the work and give them the parts list above. That should work to fix your issues. I've fixed several of these monitors so far. All the problems were related to the power supplies having bad capacitors. Same with the Planar PL1700 LCD monitors.
There is also a single capacitor on the display logic board, but I haven't seen this one go bad yet.
Good luck!

-Chip

Nov 22, 2008 | Planar PL2010M 20" Flat Panel LCD Monitor

2 Answers

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Could have blown some capacitors inside the monitor.
I just fixed one today that had no power, the blue ring around the power button didn't even light up when plugged in.
I open it and found 3 bulgingcapacitors on the power/inverter board.
They were all 25V 470uF rated capacitors.
Went to radioshack and found 2 35V 470uf, got them at $1.29 each, then I found 1 50V 470uF out of a dc car power adapter for an ipod, it was as close as I could find.
Replaced the 3 broken/bulging ones with the new/salvaged ones, put it back together, plugged it in and the blue light came on when I pushed the power button.
Plugged it in to my laptop with vga cable, and it works great.

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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

1 Answer

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This is the same problem I've seen several times. Fix the power supply board inside the display itself. It's giving the logic board and backlights fluctuating power and they just can't keep up.

There is a supplier of power boards online, you can google them with numbers from the board but I don't suggest using them. Look for information on the company also. I've seen a lot of complaints for this "international" company.

The fix for most of the problems on these monitors is about $8 on new capacitors (Plus shipping).

First check that you are getting a strong 12V from the external power adapter. If so, the problems may be as simple as changing out a few capacitors.

On the PL2010M monitors you need the following parts. I've added digikey part numbers to make life easier:

P10271-ND 220UF 25V Capacitor (3 or 4 depending on PS)
P10275-ND 470UF 25V Capacitor (1)
P10221-ND 470UF 10V Capacitor (4)

If you're not comfortable with soldering and de-soldering electronics, take it to a local technitian for the work and give them the parts list above. That should work to fix your issues. I've fixed several of these monitors so far. All the problems were related to the power supplies having bad capacitors. Same with the Planar PL1700 LCD monitors.

Good luck!

-Chip

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4 Answers

About the VL2018W (BLACK) Monitor soultion you posted


You need to replace 6 capacitors on the power supply board. Princeton uses CapXon brand capacitors which last about 1 to 2 years before going bad. CapXon are extremely poor quality capacitors, saving Princeton 10 to 20 cents per monitor.
This is the list of capacitors you need to replace. If they aren't bad now, they will be.
qty 2: 1000uF, 10V (DigiKey 565-1646-ND)
qty 3: 470uF, 25V (DigiKey 565-1677-ND)
qty 1: 470uF, 10V (DigiKey 565-1643-ND)

You can get United Chemi-Con replacements at DigiKey. The DigiKey stock number is listed on the above list. Since DigiKey didn't have stock on the 470uF, 10V at the time I ordered, I substituted a 680uF, 10V (DigiKey 565-1644-ND) which is a larger diameter, but will fit in the area provided.

Apr 08, 2008 | Princeton Digital VL2018W Monitor

5 Answers

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hello guys

I had the same problem. My LCD ViewSonic VX 924 has been blinking

For repar it i changed the following capacitors : 100uF/400v
330uF/25v and 330uF/35v

if that always flickers you can also change the two 470uF/25v capacitors
The link for a pic Alime and Capacitors
http://img25.imageshack.us/my.php?image=alimefsp0351pi01.jpg

DO NOT TOUCH NOTHING D'OTHERS ANS DISCONNECT ELECTRICITY CABLE BEFORE PROCEEDING

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