Viewsonic VA912b display is messed up. Just received this monitor today and it plugs in and powers up fine, but the display is messed up. There are no bad lines or anything, but it seems blurry and distorted. Does anyone know where I should start investigating?
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Viewsonic VA912b messed up display
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Re: Viewsonic VA912b messed up display
A picture might help. Are you using the analog or the digital input? Also check the video refresh rate and resolution.
PlainBillFor 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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Re: Viewsonic VA912b messed up display
Viewsonic likes cheap caps in power supply (often Elite brand).
Signal won't be good with noise in the power.
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
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Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
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You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Re: Viewsonic VA912b messed up display
You are just at fuzzy screen stage.
Possible (and likely) cause:
Degrading caps are letting noise into the power to video section so the video circuits are suffering from 'dirty' power and you get a muddy video signal.
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By the time they bloat you'll probably be having problems even just keeping it on.
Another possible cause is a bad video cable.
Does the one you are using have a ferrite (ideally two).
[see pic of a ferrite on a usb cable]
I have some monitors that get 'snow' if I don't use a ferrite'ed cable.
What caps do you see in there?
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Re: Viewsonic VA912b messed up display
Originally posted by AdasmI investigated the caps and none of them are bulging or leaking. Is it advisable to replace them anyway?
I just replaced all the electrolytic caps in a FPD1760 power supply and inverter. Total cost including shipping was about $6. Replacing all the caps took less than half an hour. I gladly spent an extra $5 (and 25 minutes) to be confident I won't have to pull the monitor apart again. This is especially prudent if the caps are a brand that is notorious for failures.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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Re: Viewsonic VA912b messed up display
Originally posted by PlainBillYes. Bulging or leaking are very obvious signs of failure. Other problems can be much less obvious. An ESR meter ($70 and up) will help identify failing or marginal caps, but even that isn't an absolute test.
I just replaced all the electrolytic caps in a FPD1760 power supply and inverter. Total cost including shipping was about $6. Replacing all the caps took less than half an hour. I gladly spent an extra $5 (and 25 minutes) to be confident I won't have to pull the monitor apart again. This is especially prudent if the caps are a brand that is notorious for failures.There are 10 kind of people in this world: those that understand binary, and those who don't.- ASUS ROG Maximus IX Code
- Intel Core i5-7600K 3.8GHz
- 16gb GSKILL TridentZ RGB DDR4-3200
- 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
- Windows 10 Pro x64
- GeForce GT1050
2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )
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Re: Viewsonic VA912b messed up display
Originally posted by AdasmThe brand of caps on the PSU is CapXon.
I see: 5x - 470uF 25V
1x - 100uF 400V
1x - 470uF 10V
1x - 22uF 50V
These are all the radial caps on the PSU. I can put a pic up tomorrow.There are 10 kind of people in this world: those that understand binary, and those who don't.- ASUS ROG Maximus IX Code
- Intel Core i5-7600K 3.8GHz
- 16gb GSKILL TridentZ RGB DDR4-3200
- 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
- Windows 10 Pro x64
- GeForce GT1050
2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )
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Re: Viewsonic VA912b messed up display
I agree.
The 400v is on the AC side, wouldn't cause your problem, and those rarely go out anyway short of a power surge.
Using all 25v for the 470uF is fine too.
I'd replace the 22uF just because I'm in there anyway and they are cheap.
[But that's just me.]
CapXon will have a 2 digit letter code that identifies the series.
'Series' is like a model name.
Need it to find the data sheet to find original ESR/Ripple for cross reference.
Diameter also helps. Units are mm.
Does no good to buy a fat one if only a skinny will fit.
Length only matters if you have height restrictions as installed.
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Re: Viewsonic VA912b messed up display
Originally posted by PCBONEZI agree.
I'd replace the 22uF just because I'm in there anyway and they are cheap. [But that's just me.]There are 10 kind of people in this world: those that understand binary, and those who don't.- ASUS ROG Maximus IX Code
- Intel Core i5-7600K 3.8GHz
- 16gb GSKILL TridentZ RGB DDR4-3200
- 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
- Windows 10 Pro x64
- GeForce GT1050
2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )
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Re: Viewsonic VA912b messed up display
Tried to upload data sheet because CapXon's new site is an abortion but this site won't allow PDF's over 195.3k.
- Rather useless given that many PDF's are full color (and so larger) these days.
In KF series -> Ripple/ESR:
470uF 25V -> 1200/0.065
470uF 10V -> 580/0.250
22uF 50V -> 135/1.350
100uF 400V -> 950/0.520
Ripple is in mA at 105C and 100KHz -and- ESR is Ohms at 20C and 100KHz.
[Like they are supposed to be.]
If you go to Digikey, out of what they stock, you will need either Chemicon KZE or Panasonic FM to meet or beat those specs.
The 400v may be an exception. There are some series' that only come in higher volts and I dunno all of those off the top of my head. Probably don't need to replace that one anyway.
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
-
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Re: Viewsonic VA912b messed up display
I've just been through the same thing with my VX922. It would turn on (for a few seconds) then the green power light would start blinking long-on, short-off. After a few attempts, it was possible to get it to start and stay on, but turn it off and you get to play the whole game again.
Getting it open is a pain -- four screws on the corners to remove, then force a metal spatula between the silver surround and the back of the case. There are about half a dozen clips holding it together -- unlock a corner first, then work your way around.
Once you're in, there are some aluminium foil pads covering the shielding screws and connectors. But first... remove the jackposts for the DVI and VGA connectors.
After you've got the jackposts out, remove the alu foil and the four screws holding the PCB shield to the display frame. Remove the following connectors:
- Pink and blue cables left side top and bottom (4x) -- backlight drive. Squeeze the top of the connector, and pull out.
- Black two-row mini-connector (1x), top side -- display data stream (LVDS?)
- White mini-connector (1x), right side -- front panel connectors
Once the connectors are out, lift off the shielding pack. The two PCBs (AC supply/backlight inverter and display driver) will come with it. Remove 7 screws and one plastic insulator plate, then lift out the PCBs.
The PSU will probably be populated with Capxon capacitors. These are likely the ones causing the problem. As PCBONEZ et al mentioned, the 400V 100uF DC smoother rarely fails, so you can leave it if you like. Shotgun the rest of the capacitors, though. I decided that I didn't want my monitor breaking at another inopportune moment later on, so shotgunned the whole lot -- 8 capacitors in all
If this doesn't fix the monitor, stare daggers at the Teapo capacitors on the driver board. Don't replace these unless you absolutely have to -- the PCB is multilayer (appears to be 4-layer, possibly more) was designed without thermal reliefs, so soldering the grounds on the capacitors is incredibly difficult. I replaced these as well, because I'm a glutton for punishment
Reassembly is, as the saying goes, the reverse of disassembly
After shotgun replacing every single electrolytic in the '922 with decent parts (Panasonic FM and FC series), it's working perfectly again. I could swear the video quality (even on VGA) is better than it has been for ages...
FYI: This was done on a Viewsonic VX922, mfg date December/2006 (so it's a shade over 2 years old). I actually called Viewsonic, who basically told me that the "three year warranty" was "coincidentally" changed to a 2-year warranty last year, and my options were basically buy a new monitor or pay nearly £150 to have this one fixed, me paying shipping both ways, with no guarantee it'd be fixed or even that I'd get the same monitor back...
Now I have no warranty (not that I had one to begin with), but I do have what I consider to be a "slightly souped up" VX922 that should hopefully last until the backlight tubes wear out
I don't think I'll be buying another Viewsonic TFT... unless I have a severe lapse in judgement... or perhaps if Hell freezes over
- Phil.
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Re: Viewsonic VA912b messed up display
Hey guys I also have Viewsonic VA912B monitor, when turned on, I keeping hearing a click, some squealing through the built in speaker, and power just recycles on the monitor. I haven't opened it up yet, but does it sound like bad power supply? Where's a good place to order the power supply for these monitors if it is.
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Re: Viewsonic VA912b messed up display
Originally posted by marco916Hey guys I also have Viewsonic VA912B monitor, when turned on, I keeping hearing a click, some squealing through the built in speaker, and power just recycles on the monitor. I haven't opened it up yet, but does it sound like bad power supply? Where's a good place to order the power supply for these monitors if it is.
It would be better if you try to fix yours first. Open the unit , take some pictures, and wait for an answer asking for specific information based on what your pictures show or don't show. It would be cheaper than hunting a power supply for the unit.There are 10 kind of people in this world: those that understand binary, and those who don't.- ASUS ROG Maximus IX Code
- Intel Core i5-7600K 3.8GHz
- 16gb GSKILL TridentZ RGB DDR4-3200
- 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
- Windows 10 Pro x64
- GeForce GT1050
2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job )
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