Hanns G HG281D 2 second black screen and parts help

[jleon92f]

Re: Hanns G HG281D 2 second black screen and parts help

Hi, this is my 1st post. I have a similar power problem with my HG281D. It would boot up normal and sometime it would go black. The on/off switch would be non responsive, I would have to click it 5-10 time to get the piture back for a few seconds. It would go out again, I repeat the above and it would stay on. If I let it in yellow stand-by it would come on OK for a few days, maybe a week until the problem startes again.

After reading some of the post here I took it a part and noiticed bad solder connections on the smaller pCB, I guess this is a lodgic board? I ordered the kit for the PSB.

100_6346 by jleon92f, on Flickr

So I am waiting now for my parts.
I will update when it is back together.

Thanks,
John.

[budm]

Re: Hanns G HG281D 2 second black screen and parts help

Did you order the two caps (100uf 16vdc) by the voltage regulators on the main/logic board also?
https://www.badcaps.net/forum/showth...427#post334427
read post 427 and later.

[jleon92f]

Re: Hanns G HG281D 2 second black screen and parts help

Did you order the two caps (100uf 16vdc) by the voltage regulators on the main/logic board also?
https://www.badcaps.net/forum/showth...427#post334427
read post 427 and later.

I ordered the kit through Amazon.com? 22 caps?
John.

[jleon92f]

Re: Hanns G HG281D 2 second black screen and parts help

What does the "Main Logic" board look like?

John.

[budm]

Re: Hanns G HG281D 2 second black screen and parts help

The board where the VGA/DVI connectors are. POST41

[jleon92f]

Re: Hanns G HG281D 2 second black screen and parts help

The board where the VGA/DVI connectors are. POST41

Thanks, parts came today!

John.

[budm]

Re: Hanns G HG281D 2 second black screen and parts help

I believe the capacitor kit is for recapping the power supply board only, not including the caps for the main board.
Did you try running the Video on PC at the lowest resolution to see if the screen will stay on yet?

[jleon92f]

Re: Hanns G HG281D 2 second black screen and parts help

I believe the capacitor kit is for recapping the power supply board only, not including the caps for the main board.
Did you try running the Video on PC at the lowest resolution to see if the screen will stay on yet?

Monitor is apart right now. I am doing both PCB's.

Thanks,
John.

[jleon92f]

Re: Hanns G HG281D 2 second black screen and parts help

Are these the ones?

[jleon92f]

Re: Hanns G HG281D 2 second black screen and parts help

R&R caps...I have 100Uf 50v for the Logic Board?

John.

[budm]

Re: Hanns G HG281D 2 second black screen and parts help

Yes, they should be low ESR type also. you can try regular one for now for testing.

[jleon92f]

Re: Hanns G HG281D 2 second black screen and parts help

Thank you.

[jleon92f]

Re: Hanns G HG281D 2 second black screen and parts help

Doing the next section today..

[jleon92f]

Re: Hanns G HG281D 2 second black screen and parts help

UPDATE: All done and it works fine again, Thank you All for your Help!


100_6421 by jleon92f, on Flickr

John.

[budm]

Re: Hanns G HG281D 2 second black screen and parts help

Great work, and thanks for posting the result.

[jleon92f]

Re: Hanns G HG281D 2 second black screen and parts help

Great work, and thanks for posting the result.

Thank You All. Amazing when it all comes together.

John.

[jetal]

Re: Hanns G HG281D 2 second black screen and parts help

Sorry to resurrect a old thread, but I was having this issue too and replacing all 3 of 100uf 16v caps on the logic board fixed the issue for me. I salvaged some caps from an old usb2 pci card, so with a little extra work, it cost me $0.00. woot!

Woot Indeed. Thanks for the tip about those specific caps.
I had an old sound card lying in drawer that kindly sacrificed itself for the project.


I had/have the problem described in this thread.
This is my first post but I've been reading others' posts (scattered about the interwebs) on this model for over 6 months.
I DigiKeyed a bunch of caps for the power board and thought I had it fixed, but it seems the 3day shipping wait was just the longest I'd left the monitor unplugged and it started blacking again after a few more days.

I replaced the 3 you mentioned... It turns on and works so far but it has been unplugged for 3 months this time. Here's hoping :-)
I bought my HG281 back in '08 when they were $489 on sale.

[r3z0nate]

Re: Hanns G HG281D 2 second black screen and parts help

I went off the list of parts from several different posts regarding this monitor and basically found I need to re-purchase about half of the capacitors. Obviously I would not blame anyone buy myself, but I have seen several mentions for a 1000 uF 25v capacitor when my board has a 680 uF 25v cap.

I also purchased several others that are 120 uF replacing 100uF.

I'm not worried about the above, but I've read higher voltage doesn't matter as much as the uF. Am I overreacting?

In case anyone was interested, all the caps on the logic board are 25v and not 16v.
I put it back together temporarily until new parts come, but now it displays a solid red color.

[budm]

Re: Hanns G HG281D 2 second black screen and parts help

Those two cap are for circuit with less than 5V, so 16V cap will be more than enough.
My board has 100uf 16v.
http://s807.photobucket.com/user/bud...ml?sort=3&o=16

[r3z0nate]

Re: Hanns G HG281D 2 second black screen and parts help

Those two cap are for circuit with less than 5V, so 16V cap will be more than enough.
My board has 100uf 16v.
http://s807.photobucket.com/user/bud...ml?sort=3&o=16

Thanks, what do you think about the 25v capacitors on the power supply board?