Viewsonic VG191b

[Lakerat]

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 cord

[retiredcaps]

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?

Pictures? Pictures!!!

What does this fuse look like?

Fuses may go bad by themselves. OR some other component is drawing too much current and causing the fuse to blow.

Replacing the fuse without testing other components like transistors or FETs for shorts is likely to blow the fuse.

[Lakerat]

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?

[retiredcaps]

Re: Viewsonic VG191b

The inveter board is a long narrow rectangle.

If I'm thinking like Rtech, I suspect you may have a blown fuse or a shorted transistor on the inverter board.

Thus, you will need a multimeter to test.

[Lakerat]

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.

[Rtech]

Re: Viewsonic VG191b

I assume that,'the power supply being on the power cord',means its an external adaptor ??If that is the case,and as requested by retired Caps, you take some photos,ensure very clear ones are taken of the Inverter board(this is usually rectangular, smallish,and the Screen lamps plug into it.

[Lakerat]

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.

[retiredcaps]

Re: Viewsonic VG191b

I'm new here with very limited electronic exp. (electronic techs help me out at work).

When you turn on the LCD, do you see the backlight flash on briefly? Or is it just black?

The answer matters because it tells us which direction to look for problems.

Post clear focused pictures AFTER reading

https://www.badcaps.net/forum/showthread.php?t=1868

Please do not post pictures inline.

Take your boards to a window on a sunny day, turn flash off, and use macro mode. Take a top down view of all your boards (front and back). Make sure the photo is legible so that we can read the PCB printing clearly. A shutter speed of 1/125 or faster will produce nice clear focus pictures. Try to get a photo that is 2000x2000 resolution or as close as possible.

Here is an example of the pictures we want.

https://www.badcaps.net/forum/showpos...94&postcount=1

[Lakerat]

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