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Old 12-08-2010, 11:13 AM   #1
wcperki
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Exclamation 2 Viewsonic VX1940W buzzing and no signal

The 2 Viewsonic X1940W LCD monitors I bought as a dual monitor set are both not working. They are still underwarranty but I could'nt help myself I had to take one apart. I could use some help getting the right caps ordered.
I tried mouser and digikey but gave up. I'd prefer to just order from badcaps.net but here too I run into a roadblock with exact matches.
I'd like to know what I can safely use to replace the following caps. Also, can anyone tell me how does one remove the epoxy glue inorder to de-solder?
Pictures are attached.
C1
CapXon
GF105
P735 vent
220μF 35v
D=10mm x L=12mm x LEAD SPACE=5mm

C302
CapXon
GF105
P735 vent
220μF 35v
10mm x 12mm x 5mm

C305
CapXon
GF 105 c
P735 vent
2200μF 10V
13mm x 18mm x 5mm

C307
CapXon P735 vent
KF 105c
1000μF 10V
8mm x 20mm x4mm

C205
KF105 P733
50V 22μF
5mm X 8MM x 3mm


Thanks,
Warren
Attached Images
File Type: jpg 1911.jpg (1.7 KB, 432 views)
File Type: jpg IMG_1062.jpg (264.1 KB, 197 views)
File Type: jpg IMG_1064.jpg (195.9 KB, 142 views)
File Type: jpg IMG_1066.jpg (151.7 KB, 127 views)
File Type: jpg IMG_1067.jpg (204.0 KB, 139 views)
File Type: jpg IMG_1069.jpg (354.4 KB, 115 views)
File Type: jpg IMG_1080.jpg (388.5 KB, 111 views)

Last edited by wcperki; 12-08-2010 at 11:17 AM..
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Old 12-08-2010, 11:15 AM   #2
wcperki
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Default Re: 2 Viewsonic VX1940W buzzing and no signal

From what I found on the web these monitors share the same Back Light Inverter
Power Input Board as my VIEWSONIC VX1940W model VS11868.

Darfon b092-xx4h.b0920.001
Westinghouse 27-D021625 Power Supply Unit
Part Number 27-D021625
Board Number(s) B092-XXX4H.B0920.001/D2

TV Panel ManμFacturer Chi Mei
Acer P191W and X193W
VIEWSONIC VX1940W model VS11868, VP2030B, VX1962WM
Westinghouse L1916HW

Last edited by wcperki; 12-08-2010 at 11:24 AM..
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Old 12-08-2010, 11:25 AM   #3
romansroad
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Default Re: 2 Viewsonic VX1940W buzzing and no signal

You are going to fit in here so well!!! Under warranty and still taking them apart!!!

Nice pics, and since you did them right (no inline) Plain Bill will be gratified as well.

As to the glue, it just pops off most surfaces, leaving a slight residue on the board side. I use a dental tool, but a small flat head screwdriver is just fine. No need to reglue after recapping.

As to which ones, I do see a bulge on the close ups of several, so, in general, replace all on the inverter board except the big one. It experiences lower frequency loads and usually doesn't fail. If it looks bad, however, do replace it. They can be $4 or so, which is usually the total for all the others combined.

There was a recent post on step-by-step Digikey ordering which was really good....just can't recall who wrote it. Their site is daunting if you don't narrow it down early. I use Panasonics FM series for this application, and if you go to DIgikey, pick electrolytics, and them specify Panasonic FM. Then pick your voltage/capacitance and sizes from the now much shorter list. If the size is okay, you can always pick a higher voltage than your original, as it will slowly reform to the working voltage anyway. Don't go lower, and don't use 85 degree C caps....only the 105 degree C ones.

Welcome aboard!
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Old 12-08-2010, 11:41 AM   #4
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Default Re: 2 Viewsonic VX1940W buzzing and no signal

Okay, I couldn't stand it.....here are the Digikey part #'s.....recheck the sizes as some were slightly off, but they should still fit.

220uf/35v....... P12411-ND
2200uf/10v.......P12357-ND
1000/10v..........P12345-ND
22/50v.............P12927-ND

Have fun and keep us updated.....Be sure your soldering iron has the right heat range(s). Judging by your first post, you probablly already have this covered!
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Old 12-08-2010, 11:43 AM   #5
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Default Re: 2 Viewsonic VX1940W buzzing and no signal

Forgot....Digikey lists these under "aluminum" not electrolytics as I said first.
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Old 12-08-2010, 11:47 AM   #6
wcperki
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Default Re: 2 Viewsonic VX1940W buzzing and no signal

Taking things apart has always been a facination problem is It's not always possible to get stuff working again.
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Old 12-08-2010, 11:49 AM   #7
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Default Re: 2 Viewsonic VX1940W buzzing and no signal

Now that's the fun part.....never giving up!
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Old 12-08-2010, 12:18 PM   #8
wcperki
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Default Re: 2 Viewsonic VX1940W buzzing and no signal

Quote:
Originally Posted by romansroad View Post
Okay, I couldn't stand it.....here are the Digikey part #'s.....recheck the sizes as some were slightly off, but they should still fit.

220uf/35v....... P12411-ND
2200uf/10v.......P12357-ND
1000/10v..........P12345-ND
22/50v.............P12927-ND

Have fun and keep us updated.....Be sure your soldering iron has the right heat range(s). Judging by your first post, you probablly already have this covered!
Thanks, Looks like there is a typo. P12345-ND a 6.3v should be P12354-ND a 10 v. I found the "catalogue" this time which makes it easier to look things up.
http://onlinecatalog.digikey.com/Web...PageLabel=1648
Does one always keep same uF spec?
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Old 12-08-2010, 12:26 PM   #9
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Default Re: 2 Viewsonic VX1940W buzzing and no signal

Typo vs. dyslexia! Kidding!

The key to replacing the caps is the capacitance, so don't stray from the uf of the original. You can go up in voltage, and change sizes as the board allows.

Use Digikeys cheap USPS shipping option, not UPS or Fed Ex. Pretty fast shipping and low cost.
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Old 12-08-2010, 12:28 PM   #10
wcperki
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Default Re: 2 Viewsonic VX1940W buzzing and no signal

Something interesting, when I search under Panasonic part number EEU-FM1V221
it returns two capicators one is a 3000hr 1.24amp 41 38 mOhm the other a 4000hr 1.29amp 38 mOhm. Which to chose 4000hr Im guessing?












All prices are in US dollars.
Image Digi-Key Part Number Manufacturer Part Number Description Series Manufacturer Capacitance Voltage Rating Tolerance Lifetime @ Temp. Operating Temperature Features Ripple Current ESR (Equivalent Series Resistance) Impedance Mounting Type Package / Case Size / Dimension Height Lead Spacing Surface Mount Land Size Packaging Quantity Available Minimum Quantity Unit Price

P12412-ND EEU-FM1V221L CAP 220UF 35V ELECT FM RADIAL FM Panasonic - ECG 220F 35V 20% 3000 Hrs @ 105C -40C ~ 105C General Purpose 1.24A - 41 mOhm Through Hole Radial, Can 0.315" Dia (8.00mm) 0.591" (15.00mm) 0.138" (3.50mm) - Bulk 13,680 1 0.50000
P12411-ND EEU-FM1V221 CAP 220UF 35V ELECT FM RADIAL FM Panasonic - ECG 220F 35V 20% 4000 Hrs @ 105C -40C ~ 105C General Purpose 1.29A - 38 mOhm Through Hole Radial, Can 0.394" Dia (10.00mm) 0.492" (12.50mm) 0.197" (5.00mm) - Bulk 54,7
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Old 12-08-2010, 12:36 PM   #11
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Default Re: 2 Viewsonic VX1940W buzzing and no signal

Quote:
Originally Posted by wcperki View Post
Something interesting, when I search under Panasonic part number EEU-FM1V221
it returns two capicators one is a 3000hr 1.24amp 41 38 mOhm the other a 4000hr 1.29amp 38 mOhm. Which to chose 4000hr Im guessing?












All prices are in US dollars.
Image Digi-Key Part Number Manufacturer Part Number Description Series Manufacturer Capacitance Voltage Rating Tolerance Lifetime @ Temp. Operating Temperature Features Ripple Current ESR (Equivalent Series Resistance) Impedance Mounting Type Package / Case Size / Dimension Height Lead Spacing Surface Mount Land Size Packaging Quantity Available Minimum Quantity Unit Price

P12412-ND EEU-FM1V221L CAP 220UF 35V ELECT FM RADIAL FM Panasonic - ECG 220F 35V 20% 3000 Hrs @ 105C -40C ~ 105C General Purpose 1.24A - 41 mOhm Through Hole Radial, Can 0.315" Dia (8.00mm) 0.591" (15.00mm) 0.138" (3.50mm) - Bulk 13,680 1 0.50000
P12411-ND EEU-FM1V221 CAP 220UF 35V ELECT FM RADIAL FM Panasonic - ECG 220F 35V 20% 4000 Hrs @ 105C -40C ~ 105C General Purpose 1.29A - 38 mOhm Through Hole Radial, Can 0.394" Dia (10.00mm) 0.492" (12.50mm) 0.197" (5.00mm) - Bulk 54,7
Choose based on dimensions (form factor). Some Panasonic caps are available in standard (no suffix), short (S suffix) and tall (L suffix). Note: you profile doesn't indicate where you are. Digikey is very good if you are in the USA; not so good if you live outside North America.

PlainBill
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For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.
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Old 12-08-2010, 12:53 PM   #12
wcperki
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Red face Re: 2 Viewsonic VX1940W buzzing and no signal

Ok, attached is my parts list. I ordered one extra set for a friend who also has the same monitor
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Old 12-08-2010, 12:56 PM   #13
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Default Re: 2 Viewsonic VX1940W buzzing and no signal

Very true on the USA aspect....missed that. I always wondered about the form factor codes.....thanks!
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Old 12-08-2010, 12:57 PM   #14
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Default Re: 2 Viewsonic VX1940W buzzing and no signal

Less than $10 for each monitor and you should be back in business in no time.....NICE!
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Old 12-08-2010, 05:15 PM   #15
wcperki
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Thumbs up Re: 2 Viewsonic VX1940W buzzing and no signal

Quote:
Originally Posted by romansroad View Post
Less than $10 for each monitor and you should be back in business in no time.....NICE!
That was $11.29 total enough for 3 monitors so cost w/ tax + shipping is really only $3.77 for each monitor. I placed the order around noon and got confirmation it had shipped at 1:30 via U.S. Postal Service First Class Mail as you suggested. I expect to have parts by Friday or Saturday. Not bad, to me it's less hassel than finding shipping boxs, getting what is it a RMA, and shipping 2 monitors back for warranty work. Only question is what Viewsonic would have replaced or repaired my units.
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Old 12-08-2010, 05:47 PM   #16
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Default Re: 2 Viewsonic VX1940W buzzing and no signal

Usually when a monitor is replaced under warranty the replacement is a refurbished unit. Often it's not even the same model monitor. That wouldn't be too bad if your 17" monitor was replaced with a 21" wide screen, but it doesn't usually happen that way.

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Old 01-06-2011, 07:02 PM   #17
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Default Re: 2 Viewsonic VX1940W buzzing and no signal

Quote:
Originally Posted by PlainBill View Post
Usually when a monitor is replaced under warranty the replacement is a refurbished unit. Often it's not even the same model monitor. That wouldn't be too bad if your 17" monitor was replaced with a 21" wide screen, but it doesn't usually happen that way.

PlainBill
you're right. ...but, then

A while back, my ViewSonic VX922 was giving me fits... it'd take more and more "power on" cycles for it to actually come on. Eventually, it wouldn't come on at all. At that time, I had owned the monitor for 2 years and 360 days (that's right, 5 days shy of the 3-year warranty period). I guess I was feeling lazy, and I had a [borrowed] monitor to use in the interim, so I got the RMA and sent it off to ViewSonic. Two weeks later, they replaced it with a brand new (manufacture date was just a tad over a month prior to when it showed up on my doorstep!) ViewSonic VX1940w.

For those keeping score at home, they replaced my (almost) 3-year old, 4 ms 19" 4:3 ratio monitor with a brand new 2 ms 19" 16:10 monitor, under warranty.

...which brings me here, today.

I've had this monitor (VX1940w) now since August 2008. Under the terms of their warranty, it (despite being brand new) only came with a 5-day warranty (the unit sent inherits the remainder of the originally-purchased monitor's warranty). The day before yesterday, the screen went black. Subsequent attempts to power it on resulted in a very dim display, accompanied with the audible oscillation noted earlier in this thread, for 10-15 seconds, then back to black. ...a classic symptom of the "bad capacitors in the inverter" problem noted here.

As much as I'd like to find an excuse to buy a new 22" or 24" widescreen monitor to replace it, my bank account would be significantly happier spending $5.00 or so to fix this monitor than to spend a couple hundred $ buying a new monitor. ...so, I guess I'm off to purchase a few caps, locate a clean butter knife from the kitchen, and get cozy with my desoldering and soldering stations for a few minutes.

Thanks for this forum, and for allowing me to become a part of it. I hope that I can learn a few new tricks here while simultaneously sharing some of my acquired wisdom/knowledge to others.
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Old 01-07-2011, 03:39 PM   #18
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Question Re: 2 Viewsonic VX1940W buzzing and no signal

okay, so a few hours later, and I've torn apart my VX1940w, and pulled out the power board. pic attached.

two caps are clearly in need of replacement (220 uF 35V)

I'm not sure about the other -- there's no bulging on the end, but the splitting of the plastic covering has me a bit concerned. should I just go ahead and order up a 120 uF 400V cap as well, and install it while I have everything apart?
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Old 01-07-2011, 03:46 PM   #19
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Default Re: 2 Viewsonic VX1940W buzzing and no signal

Quote:
Originally Posted by briand View Post
okay, so a few hours later, and I've torn apart my VX1940w, and pulled out the power board. pic attached.

two caps are clearly in need of replacement (220 uF 35V)

I'm not sure about the other -- there's no bulging on the end, but the splitting of the plastic covering has me a bit concerned. should I just go ahead and order up a 120 uF 400V cap as well, and install it while I have everything apart?
Yes, go ahead and replace it. It won't be that much more money. Definitely replace the other 3 small caps that aren't swollen. It's only a matter of time before they also fail.
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Old 01-07-2011, 04:06 PM   #20
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Default Re: 2 Viewsonic VX1940W buzzing and no signal

Quote:
Originally Posted by briand View Post
should I just go ahead and order up a 120 uF 400V cap as well, and install it while I have everything apart?
It doesn't look too healthy in that picture with the plastic sleeve warped near the bottom. I would replace it. Capxon doesn't have the greatest respect on this forum.
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