Re: Problem with Viewsonic VG920 lcd monitor
PlainBill-
I hear you, I guess this is one LCD that just can't be fixed with a simple solution. It would probably take more money then it is worth and nowadays with LED monitors being so cheap you can buy a new one, rather then sink alot of money into fixing an older LCD. IMO though it was worth the time and effort to try. I really do appreciate all of [SIZE=3][COLOR=Red][B][U][I]your[/I][/U][/B][/COLOR][/SIZE] time and effort and putting up with a noob and walking me through the diagnostic process to try and trouble shoot...
mrpd
Member
Last Activity: 09-15-2014, 11:09 PM
Joined: 11-16-2009
Location: AZ
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Last edited by mrpd; 09-28-2010, 08:11 PM. -
Re: Problem with Viewsonic VG920 lcd monitor
Yes sir I did but still nothing....Leave a comment:
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Re: Problem with Viewsonic VG920 lcd monitor
PlainBill
holding the black probe on a screw and touching the solder pads the voltages are left - 0.00, right - 0.12 and the top - 4.95. I also did a reading across the two 'bottom' pins by touching the black probe on the left and the red on the right and it read 0.12. I tried shorting the two pins together but still nothing no green power light or the LCD turned on.Leave a comment:
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Re: Problem with Viewsonic VG920 lcd monitor
Acouple of quick questions for you ...
By this above do you mean the reset controller? If so I can't put it back on, it turns out my problem was that the controller was fried. When I removed it it fell apart so I don't have it anymore.
I tried to duplicate exactly what I did and nothing comes on. All I did was remove the reset controller and then I tried the button. The green light came on and the LCD did to. I shut it off and tired it one more time and it came on again. I then put...Leave a comment:
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Re: Problem with Viewsonic VG920 lcd monitor
Plainbill-
Thankyou for that part number I found the reset controller. I do have another issue though. From the other posts
I did take off the reset controller to verify that this is the problem and guess what? It was, but I have another issue now. Although it did turn on and I saw the viewsonic screen. I shut it off using the button I put it back together (plastic housing ect) it now will not turn on, again. I have no green light no screen at all. So what do you think might have happened now? I...Leave a comment:
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Re: Problem with Viewsonic VG920 lcd monitor
I agree but you know I couldn't find it on digikey I looked, I did a search and put in the part numbers but no luck. Maybe it is just me but do you maybe got a link for it on digikey?
Thanks,...Leave a comment:
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Re: Problem with Viewsonic VG920 lcd monitor
Thanks for still looking at the older thread PlainBill!!
This LCD has never been or never will be for sale it is mine. It is one that I have lying around that didn't work, I would rather try and fix it and maybe use it for something like an LCD for building or trouble shooting computers then just throw it away if it is something as simple and small as this. I would never sell this LCD in the condition it is in or would be in, for sure. My concern is could anything burn up (or cause a fire) by leaving the reset controller...Leave a comment:
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Re: Problem with Viewsonic VG920 lcd monitor
Hey Plainbill This is MrPD sorry I haven't been back I got really busy with family and such but I just came across this again and I know this is really kind of old now but I am still willing to try to get this monitor back up so what do you think of what 12ax7a and Moam did?
AND
would this be something you would recommend that I should try? By the way Moam & 12ax7a if your still watching how are your monitors running?
Thanks,...Last edited by mrpd; 09-23-2010, 04:51 AM.Leave a comment:
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Re: Problem with Viewsonic VG920 lcd monitor
Plainbill-
As far as my pictures did the caps look good to you? Even though I know that a cap can look good physically but still can be bad. Is there a way to test the cap itself to check if it is good or not? Was my order sequence right for testing U406? I am still wanting to trouble shoot if you think of anything.
Thanks again for your help, I appreciate it very much.
-PDLeave a comment:
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Re: Problem with Viewsonic VG920 lcd monitor
Plainbill-
Attached are the pictures you requested, I didn't see any bulging caps in them though. I tried the other method of testing which you suggested in the other post, unforunatly I didn't get the same results as robertoisrad. My monitor did nothing. Just to go over the sequence to make sure I did it right, I assembled the lcd boards and cables, I found a screw driver just wide enough to span the two bottom leads of U406, I plugged in the monitor, I shorted the two bottom leads of U406 with the screw driver and tried...Last edited by mrpd; 11-20-2009, 01:14 AM.Leave a comment:
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Re: Problem with Viewsonic VG920 lcd monitor
Plainbill-
Glad to see your well enough to get back on here, again I thank you for your effort and time trying to trouble shoot this. Sadly I don't know of any hobbyist or professionals in your area and even if I did it would probably cost more $ to have them check it out then just to buy a new monitor. I noticed that you live in PHX so do I now I don't know if you are up to this or even do this kind of thing or not buy I would gladly pay you if you would like to see what you could find out. I don't expect something for free...Leave a comment:
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Re: Problem with Viewsonic VG920 lcd monitor
Plainbill-
Yes I found the other thread and was looking at the posts. I went ahead and did the same diagnoses on the voltage regulators
My reading are almost the same as his
Starting from the top voltage regulator :
Left - 3.30
Middle - 2.47
Right - 2.63
Top - 4.66
Middle - 3.30
Bottom - 0.00
The difference I see in the logic boards is mine has DVI and the sound board and that is about it (to me atleast)
I will see about doing...Leave a comment:
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Re: Problem with Viewsonic VG920 lcd monitor
PlainBill-
So it seems the PSU is good after all, hmm. I also get nothing on the monitor at all no power indicator nothing. I have a couple of questions for you if you don't mind answering them. 1.) This one is really stupid I know but I have been trying to turn on the lcd without having a computer hooked up to the lcd, would that cause it not to turn on? Maybe some kind of signal that comes from the vga or dvi when hooked up? I am pretty sure I know the answer to this dumb question, I mean it should at least power up the...Leave a comment:
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Re: Problem with Viewsonic VG920 lcd monitor
You said that you are working another thread with the same problem, is it with the same lcd also? Should I check out the posts?
Anyhow here is the voltages of the wires
Starting from the top wire (can also view attached picture to see color code with voltages)
[left] Black
0.01
[/left]
Brown
4.49
Red
14.45
Orange
0.00
Yellow
4.97
Green
4.97
Blue
0.00
Purple...Last edited by mrpd; 11-17-2009, 02:32 AM.Leave a comment:
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Re: Problem with Viewsonic VG920 lcd monitor
I hooked everything up and check the voltage from the large cap it is reading 169-170. So I guess that means the fuse is OK. The monitor still doesn't turn on and not sure if I mentioned it but I don't get a power light either. So what would be the next step to determine what could be the problem? Checking if the proper DC voltage is present, check the output voltages from the supply? If you would please explain just how to do this?
thanks again,
PDLast edited by mrpd; 11-16-2009, 08:17 PM.Leave a comment:
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Re: Problem with Viewsonic VG920 lcd monitor
Plainbill-
what did you mean by
I don't see anything labeled on the board near top or bottom near the multi-colored cable in the upper right corner. I am not sure what I am supposed to look for. Please explain, if you would.
PS Why can't I go back and add (edit) a previous post that I did? Am I missing something? Is is that you can only edit the post you are working on at the moment and not one that was submitted previously?...Leave a comment:
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Re: Problem with Viewsonic VG920 lcd monitor
Plainbill-
Yes I agree with you on the electrocution thing except in my case I would be taking a long sleep, which is not a good thing which is why I am asking questions that might seem kind of straight forward but it is better to be safe then sorry.
I will check the readings and post back with the results.
Toasty-
Yes that is my bad spelling the "rubicon" cap is actually spelled rub[u]y[/u]con. Sorry about that. I did go ahead and do what you suggested. I checked and just to make...Leave a comment:
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Re: Problem with Viewsonic VG920 lcd monitor
Thankyou [url="http://member.php?u=4727"]Toasty[/url] and [url="http://member.php?u=10445"]PlainBill[/url] for your quick responses. Yes I saw the attachment area below the 'Submit Reply' and 'Preview Post' buttons after I posted, I am however unable to locate the where I can edit my posts I wanted to try and fix my post but was unable to. I have taken better pictures and labeled the manufacturer(s) and info on the caps. (I used the attachment feature this time)
I am a complete noob
when it comes...
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Re: Problem with Viewsonic VG920 lcd monitor
For some reason my picture didn't come through and I can't seem to edit my post to fix it. So I will put it here.
[url="http://www.auctionzealot.com/members/mrpd/100_3582-2048x1536.jpg"]Bigger PSU Picture[/url]Re: Problem with Viewsonic VG920 lcd monitor
For some reason my picture didn't come through and I can't seem to edit my post to fix it. So I will put it here.
[url="http://www.auctionzealot.com/members/mrpd/100_3582-2048x1536.jpg"]Bigger PSU Picture[/url]Leave a comment:
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Problem with Viewsonic VG920 lcd monitor
Hello-
Found this site and hope someone can help, I have a Viewsonic VG920 lcd monitor and it won't power up at all. I have taken apart the monitor and looked at the PSU (part# 715G1492-1) and it all looks good, no bad caps that I can see. Is there a fuse that could have blown, I don't find anything that looks bad. I have been reading/searching the forum but have not found any problem with this particular monitor on here so I decided to post and see if someone had an idea of what is going on.
Picture of the PSU is below.
[URL=http://www.auctionzealot.com/members/mrpd/100_3572-2048x1536.jpg]Bigger...
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