Viewsonic VX2035WM Turns on for a few seconds then goes black

[sabre504]

Re: Viewsonic VX2035WM Turns on for a few seconds then goes black

Similar setup to the Samsung 215 had one that would come on then go off turned out to be 1 transformer ( top one )

[Welchs101]

Re: Viewsonic VX2035WM Turns on for a few seconds then goes black

ok, so i have not had a lot of time to work on this but i found a little time this morning.

I checked the transformers and the chips (see enclosed photos). I did not see anything "unusual". I know that does not mean they are good........i need to report the actual measured values and i will....once i remeasure again and record data.

I am enclosing pics of the back of the board in the inverter area.....which is where i think the problem might be............or could be the caps.........have not checked those with a cap meter yet since i have to borrow one from a friend.

I wanted to get you guys opinion on what i should check next and how.

[Uranium-235]

Re: Viewsonic VX2035WM Turns on for a few seconds then goes black

thats the exact monitor I have in my posession right now to try and fix for a friend. but my picture goes black, and the backlights stay on. kind of the opposite of yours

if you can't get this fixed, I woulden't mind buying that video board off you

[Welchs101]

Re: Viewsonic VX2035WM Turns on for a few seconds then goes black

Update:

I was able to test all the lamps in the monitor and all seem to be working fine.

One lamp is the white connector. Note: "Hot" wire is slightly larger in diameter.

One lamp is using Pink and Black wires. Note: "Hot" wire is slightly larger in diameter.

One lamp is using Light-blue and Dark-blue wires. Note: "Hot" wire is slightly larger in diameter.


I tested ALL 6 lamps and ALL seemed to be working fine.

I guess the next step is to check the transformers. I will let you know what i find.

[Rtech]

Re: Viewsonic VX2035WM Turns on for a few seconds then goes black

Have seen thos sort of set up occasionally,and you may well find that both CCFL Reflector channels hold qty 3 lamps each,so just use a test CCFL ,as normal to test the lamps individually.

[PlainBill]

Re: Viewsonic VX2035WM Turns on for a few seconds then goes black

Thanks.

I do plan on looking at the caps in more detail but before i just start removing caps I like to try the simple things like
1)testing bulbs
2)testing transformers
3)testing mosfets

I am at the beginning .....trying to test the bulbs.

Any idea on how to test the bulbs? I am just not sure which wires to test?

Trace the outputs from the transformers. On the large connectors it looks like pins 1&2 drive one CCFL and 4&5 drive another. Of course, the small connector drives a third CCFL.

PlainBill

[Welchs101]

Re: Viewsonic VX2035WM Turns on for a few seconds then goes black

Thanks.

I do plan on looking at the caps in more detail but before i just start removing caps I like to try the simple things like
1)testing bulbs
2)testing transformers
3)testing mosfets

I am at the beginning .....trying to test the bulbs.

Any idea on how to test the bulbs? I am just not sure which wires to test?

[mockingbird]

Re: Viewsonic VX2035WM Turns on for a few seconds then goes black

Get rid of those Hermei and Elite caps I see there on the PCB and replace them with something suitable.

[Welchs101]

I have a Viewsonic VX2035WM.

Turns on for a few seconds then screen goes blank. Once screen goes blank if you take a flashlight and shine it on screen you can still see the faint image on the screen.

Normally, I check the bulbs but this unit has an unusual connection scheme. I am hoping someone can tell me how to hook it up so i can test the bulbs.

Bulbs are located at the top and bottom of the screen as usual.
Bottom: Has two connectors. One connector has two wires (Both white) and one connector has 4 wires(dark-blue, black, light-blue, pink)
Top: Has two connectors. One connector has two wires (Both white) and one connector has 4 wires(dark-blue, black, light-blue, pink)


If i wanted to test the bulbs i need to know which wires go to the individual bulbs and i am not sure which wire goes where..........

can someone help?