Re: Viewsonic VG191b
UPDATE
I built my inverter and got the screen to work just meed to insulate it good
Total cost less than 15.00
Lakerat
Member
Last Activity: 10-07-2010, 05:50 PM
Joined: 09-08-2010
Location: California
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Re: Viewsonic VG191b
I made my home made inverter and can see the the screen change shades and see lights in back of screen (did not reapply tape yet).
But no picture when when computer turned on but a steady green power light on front of panel... any idea on this?
ThanksLeave a comment:
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Re: Viewsonic VG191b
I just bought a case light and tested the lights with the power supply it came with.The power supply runs off a plug from the computers power supply and has 2 plugs for lights (was 5.99 at Frys).
Could I take 2 of these power supplys and run the 4 lights for the monitor off them would the monitor work if I did this?I would use the power that goes to inveter board to run both power supplys and they look to be the right size to go where the orignal inveter board goes. would this work?
Thx
P.S. link [url]http://www.frys.com/product...Leave a comment:
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starting a power supply
I have a PC power supply and I know there is 2 pins you need to jumper if wanting to start it not hooked up to a computer.....anyone know how to do this? -
Re: Viewsonic VG191b
I opened up my main monitor and A Viewsonic and made jumpers to try them.
I also noticed that I should recap my main before trouble happens it is 5 years oldLeave a comment:
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Re: Viewsonic VG191b
OK with ohm meter on power side (input side ) of transformers I get 1 volt for the split second lights turn on when power switch is turned onLeave a comment:
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Re: Viewsonic VG191b
The lights test OK..... I put a meter across the ends of each transformers and get no readings but with power off I get the same Ohm readings for both.
So I think something that provides power to them is not working...
Where can I get a drawing on This board?Leave a comment:
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Re: Viewsonic VG191b
I did a check on voltage on main board where ribbon goes to inverter board
#1 12 #2 12 #3 12 #4 0 #5 0 #6 1 #7 5.1 #8 0 I did these with neg side of meter using case for ground . I have one more monitor but ends are different on wires for bulbs. I read somewhere that you can use a computer case light to check black light bulbs. will this work?Leave a comment:
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Re: Viewsonic VG191b
I have changed the small caps on inverter board not I can see both lights flash for a split second on to and bottom of screen....Since this has a external power supply and it plugs into other board and it is loaded with the crap X caps would could that be something to look at? power light stays on and for a few seconds I can see a image when power is turned on. I put a ohm meter at both transformers and got the same readings.Leave a comment:
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Re: Viewsonic VG191b
Ok here is what I tried... made a jumper for fuse (testing only) now when I turn it on I see the screen show Image of whats on computer for about 3-4 seconds then goes out what should I look for here?Leave a comment:
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Re: View sonic VX924
How do I check transistors for shorts? The caps I bought were from my local electronics store (NOT RATSHACK). could this be doing it?
When hooked up to comp. it acts like the power button does not work on monitor due to flashing on screen..only turns off when power cord is unpluggedLeave a comment:
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Re: View sonic VX924
I found the values of the poly propane caps from a older thread .(cap are brown in color) it said the tolerance is to be 5% The new caps have a higher voltage and a 10% tolerance
would this be causing this symptoms
I had to replace both because one cap was split open. I thought better to keep them alikeLeave a comment:
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View sonic VX924
Hi,
I have this LCD that blew the 100UF400v cap and a lot of others. board looks dark where cap let loose..I replaced all caps and both of the poly propane caps near the edge.. Monitor flashes power light and when hook up to comp. screen flash's but no viable picture
I can not get photo's until this weekend
Any idea what I might look for? -
Re: Viewsonic VG191b
Here is my photos of the board...sorry so dark...Leave a comment:
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Re: Viewsonic VG191b
I know pictures will get them here tonight !! (I'm away from home M-F and camera is at my home)
I need a layout or schematic of the inveter board
T651008.00
I checked for the layout and found all others for this monitor but not for this board any help?
ThanksLeave a comment:
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Re: Viewsonic VG191b
Sorry I can't get photos until tomorrow night. Fuse is soldered on and is a mustard color. will try my best to look at this board with a ohm meter....but first I will try to look inside power supply that is on the power cordLeave a comment:
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Re: Viewsonic VG191b
I
I have found what looks like a small fuse on inverter board marked (yellow in color) F1 does not test good what should I use in place of this or for testing ? would a minature glass fuse work?Leave a comment:
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Re: Viewsonic VG191b
The power supply is external, The inveter board is a long narrow rectangle.
Is there a reset function for this viewsonic?
Any way to check the bulbs.?
I will try to post pics tommorow night.Leave a comment:
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Re: Viewsonic VG191b
No flash on screen at all ..All black have not tried looking at screen with bright lite.
Will try to get some photo's soon getting late here.Leave a comment:
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Viewsonic VG191b
Hi,
I'm new here with very limited electronic exp. (electronic techs help me out at work).
I picked up this veiwsonic from the curb. Power light stays on but no screen at all. I opened it up and everything looks good. The power supply is on the power cord. No bulging caps at all.
Any ideas on where to start with this one?
Thanks
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