ASUS ve205 goes black

[JLucey]

I have an ASUS ve205 that comes on for a few seconds then goes black.

If I restart it I get he picture for a second and goes black again.

The led on the power button does stay blue even after the screen goes black.

One thing I noticed is if I take a flashlight and shine it on the screen, I can see my desktop.

Does this sound like my inverter board for the cffl lights has gone bad?

I have a degree in industrial electronics but ended up an accountant. I am sure I can still do some soldering.

Any suggestions would be appreciated.

I am taking off the back tonight to get the screen model and check the caps on the inverter board.

Thanks

Joe

[jayoung]

Re: ASUS ve205 goes black

You have what is commonly referred to as "2 seconds to black." The following post is a guide for troubleshooting 2 seconds to black written by retiredcaps. Check it out. 2 seconds to black can be caused by bad capacitors, bad ccfl's, bad wiring to ccfl's, shorted transistors, etc.

https://www.badcaps.net/forum/showthread.php?t=10419

If you post pictures to the forum, do not post them inline. Please use the "Go Advanced" button and then upload the pictures below the text area using the manage attachments. The pictures need to be less than 2000 pixels per side.

[JLucey]

Re: ASUS ve205 goes black

I got the back off and took pics of the boards.

Let me know where to go from here. Got the multimeter (digital) ready.

[selldoor]

Re: ASUS ve205 goes black

First thing I would check is the Inverter Transformer which is the large
black rectangle with a white label on. You need to check the resistance
of the primary and secondary coils. I am not familiar with this item so do not know which are the pins to check. I am trying to find details of it but nothing has come up on the numbers I have used so far.
We normally ask that you do not use flash in the photographs as important
detail is missing. Can you advise the part number and version of the power board.

Do you have another monitor that you could test the ccfls on?

Hi I see we have had one of these before. The pin test is shown in the thread with this picture so you can test and post your results.

https://www.badcaps.net/forum/attach...9&d=1321094967

In the attached pic of your board can you do a close up pic of the
the components ringed in red and what are the part numbers.

Can you check the soldering on item ringed in yellow - looks
a bit off in the picture. Resolder it.
The transformer pins (Circled in Blue) should also be resoldered but wait until you have posted the test results as it may have to be removed for further testing.

[JLucey]

Re: ASUS ve205 goes black

Thanks for the response.

The power board has the following numbering:

E 227809 HXF-S S4v

The paper label has the following:

5E 1170008 90131 D23 G8V41HD 677188 G

Even with a magnifying glass I can't read the IC chips.

Transformer information:

I used the numbering in the pic in your reply.

1-2 440 ohms
1-3 through 1-8 all are open
2-3 through 2-8 all are open
3-4 through 7-8 all are Zero (short)

Checked the solder joint and is fine.

I do have a 15" dell lcd that I could take apart to use the ccfl's
for testing but I am sure they are a different size. Will that make
a difference? I don't want to blow up the good ones in the dell.

Thanks again for the help

[JLucey]

Re: ASUS ve205 goes black

Got the bifocals out and I think the IC's say:

A515GGM
A10798

Sound familiar?

[selldoor]

Re: ASUS ve205 goes black

Unfortunately not - I have tried many computations A91966M AS1566M etc etc but nothing that came up with what I believe they should be, from reading the other post.
Some members have had success with cleaning the chip with isopropyl alcohol but wait a while ,others may recognize.
Can you get the bifocals and magnifier out again and try the other larger chip again on the back of the board I think its at IC801. We can then check the pinout on it as in the other post.
I do not believe testing the ccfls would damage either machine but the tests may prove inconclusive due to the difference in the length.

[retiredcaps]

Re: ASUS ve205 goes black

I do have a 15" dell lcd that I could take apart to use the ccfl's
for testing but I am sure they are a different size. Will that make
a difference? I don't want to blow up the good ones in the dell.

We have had people use different sized ccfls for testing purposes and so far no damage. Of course, you could be the first!

If you do want to try, you don't have to disassemble the ccfls from the Dell. You just need to stretch the ccfl connector to the Asus and don't let the monitors touch each other. I have done this several times with no ill effects.

[JLucey]

Re: ASUS ve205 goes black

I will open the dell15" to check the problem monitor.

Couple of questions:

No power is needed to the dell when connected via its ccfl's to the Asus correct?

Do I need a signal via the vga or dvi to the asus to check the ccfl's?

I don't know how many bulbs are on the dell 15" standard screen.

If only one, do I unplug only one of the asus's and check and then try the other. Asus has 2 connectors for ccfl's. Or do I unplug both the ccfl's in the asus and try the dell blub in connector one then two.

Sorry for the confusion, I dont want to cause harm.

Thanks for the assistance.

Joe

[retiredcaps]

Re: ASUS ve205 goes black

No power is needed to the dell when connected via its ccfl's to the Asus correct?

Correct. In fact, have the Dell completely unplugged from AC outlet when doing this.

Do I need a signal via the vga or dvi to the asus to check the ccfl's?

I always use one so I can see the desktop wallpaper. If you don't sometimes the lcd goes into sleep mode and you may mistake it for 2 seconds to black.

I don't know how many bulbs are on the dell 15" standard screen.

If only one, do I unplug only one of the asus's and check and then try the other. Asus has 2 connectors for ccfl's. Or do I unplug both the ccfl's in the asus and try the dell blub in connector one then two.

Here is what I would do.

1) Unplug one of the Asus ccfl connectors. Plug Dell into that spot. Look for 2 seconds to black.

2) Reconnect Asus. Unplug next Asus connector. Plug Dell into that sport. Look for 2 seconds to black.

3) Repeat for all other Asus connectors.

[budm]

Re: ASUS ve205 goes black

No power is needed to the dell when connected via its ccfl's to the Asus correct? Correct.
Do I need a signal via the vga or dvi to the asus to check the ccfl's? Yes, if you don't, if the monitor comes on and does not detect the video signals, then it will go into standby which means the backlights circuits will turn off.
The CCFL connectors on the DELL may not be the same as the ASUS, your ASUS has small connector, the DELL may have larger connectors.
I would connect both lamps from the DELL.
Which Dell do you have?
http://s807.photobucket.com/albums/yy352/budm/DELL/

[chewtoy]

Re: ASUS ve205 goes black

I got the back off and took pics of the boards.

Let me know where to go from here. Got the multimeter (digital) ready.

I've got the same problem. Got the back off and am looking @ 2 circuit boards. @ first glance, no blown caps, but I know little to nothing about fixing these screens.

Thanks!

[Rtech]

Re: ASUS ve205 goes black

With the Monitor powered up and the Computer supply a signal, does the Monitor recognise the signal by changing colour and remain like that, even when the image goes ??

[chewtoy]

Re: ASUS ve205 goes black

With the Monitor powered up and the Computer supply a signal, does the Monitor recognise the signal by changing colour and remain like that, even when the image goes ??

Chewtoy: The images from the computer flashes on the screen for a second, then goes blank

Pictures of the board here: https://plus.google.com/u/0/photos/1...08784561310129

[Rtech]

Re: ASUS ve205 goes black

'The images from the computer flashes on the screen for a second, then goes blank'

That does not answer the question I asked ?????

[the4biddendonut]

Re: ASUS ve205 goes black

I have the same problem as many others with the same monitor. The screen goes black after about a second after it it's turned on. I noticed that before this happened the screen would flicker.

After much research, I've found that no one has found a fix. Except a few who have had bad bulbs. There has been much discussion about bad capacitors, but that seems to be a dead end. I tested my caps using an old school method with an ohmeter, and they seem fine.

I think I did make a little progress though. As a last ditch effort to fix this damn monitor before throwing it out, I soldered a jumper across the fuse. Now the monitor works again, but it flickers and I can hear a buzzing and smell a little burning. It sounds to me like a bulb is going out.

I'm no expert at electronics, but does anyone else have any ideas what could be wrong with this but of info? I'm tempted to just use the monitor till something burns, then it would hopefully be easy to diagnose.

Any ideas?

[budm]

Re: ASUS ve205 goes black

You may be smelling burnt/arching wires on the lamp assembly. But what fuse did you jump, the fuse for the inverter circuits? Pictures of your board? You will need Cap ESR meter to check the ESR of the caps, otherwise will be best to recap the board.
Bad lamps:
http://s807.photobucket.com/user/bud...?sort=3&page=1
You should also read 2-second to blank troubleshooting in the link below.
https://www.badcaps.net/forum/showthread.php?t=10419

[the4biddendonut]

Re: ASUS ve205 goes black

You may be smelling burnt/arching wires on the lamp assembly. But what fuse did you jump, the fuse for the inverter circuits? Pictures of your board? You will need Cap ESR meter to check the ESR of the caps, otherwise will be best to recap the board.
Bad lamps:
http://s807.photobucket.com/user/bud...?sort=3&page=1
You should also read 2-second to blank troubleshooting in the link below.
https://www.badcaps.net/forum/showthread.php?t=10419

I don't have an ESR meter of the money to buy one. Or the money to buy a new monitor for that matter. Anyway, the fuse I jumped is on the inverter board, it's the same board as one that was pictured earlier in this thread.

https://www.badcaps.net/forum/attach...5&d=1330701772

It's just below the power cord plug.

I've read so much info on 2 seconds to black, and I really think this board is an exception to what is normally the cause.

I think I'll just recap the board with spare parts and see what happens. Thanks for the suggestion.

[budm]

Re: ASUS ve205 goes black

OK, that is the main AC POWER fuse. This 20" monitor only has two lamps, that is really cheap. Can you smell the Ozone when you hear the arcing sound? If it is the lamp assembly, it will not be an easy job for beginner if you have never done one before, the LCD panel can easily get damaged. If the hissing is coming from the inverter high voltage transformer, you can remove it and look under the body for any sign of damage. Also check all the solder joints real well.

[swooshrc]

Re: ASUS ve205 goes black

I have the same problem as many others with the same monitor. The screen goes black after about a second after it it's turned on. I noticed that before this happened the screen would flicker.

After much research, I've found that no one has found a fix. Except a few who have had bad bulbs. There has been much discussion about bad capacitors, but that seems to be a dead end. I tested my caps using an old school method with an ohmeter, and they seem fine.

I think I did make a little progress though. As a last ditch effort to fix this damn monitor before throwing it out, I soldered a jumper across the fuse. Now the monitor works again, but it flickers and I can hear a buzzing and smell a little burning. It sounds to me like a bulb is going out.

I'm no expert at electronics, but does anyone else have any ideas what could be wrong with this but of info? I'm tempted to just use the monitor till something burns, then it would hopefully be easy to diagnose.

Any ideas?

I just fixed my VE205 today thanks to this forum.

Like the other guys here that ended up replacing the top CCFL bulb, I had the same problem. It's an issue with the wiring or solder joint going to the top CCFL. The CCFL bulb should still be good.

Like yours, the wiring went bad and the monitor started flickering (along with a buzzing sound). When that happens the area will begin to overheat and melt the plastic surrounding & eventually the wire will short to the case.

I ended up re-soldering the wire back to the CCFL (just look up directions on various site). I did have to remove the heat shrink tubing from the harness so I could lengthen the blue wire.

Good Luck!