Hanns-G HG281D 28" TFT - Multiple Problems

[jez_h]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

Pictures need to be jpg and less than 3mb ( sometimes I think that is in total if you are trying to upload a few all together) try one at a time.

I will add a pic to this showing the possible fuses check back for it

Nooooo dont remove caps to warm them up

Haven't checked those fuses (just the red ones). Will do - thanks again

[taktikz]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

Hello! I'm having trouble with my Hanns-G 28" monitor. The screen has a problem with coming out of sleep mode and has recently started to show random lines and dots as if though it was about to go out.
Here's a video of the flicker issue: https://www.youtube.com/watch?v=M8p0GXDZc98

Any ideas?

[budm]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

Try replacing the two caps on the logic board, use low esr caps.
http://s807.photobucket.com/user/bud...?sort=3&page=1

https://www.badcaps.net/forum/showth...ghlight=HG281D

It will more likely need to have a set of caps replaced in the power supply also.

[taktikz]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

Thanks for the response. Where can I find these caps?

[selldoor]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

Digikey.com

[budm]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

Panasonic FM/FC/FR series will be fine.

[taktikz]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

http://www.digikey.com/product-search/en/capacitors

I've never done this before. Any specific ones I should look at?

[selldoor]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

As budm says - Panasonic FM/FC/FR series will be fine. you need to read the V and UF
off the existing caps and look them up - you need to get ones that will physically fit
so same height and diameter if possible

[budm]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

100uF 16VDC is what you have , right?
FR: http://www.digikey.com/product-detai...391-ND/2433525
FC: http://www.digikey.com/product-detai...1198-ND/356102

[taktikz]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

I took apart the monitor yesterday just to see which caps it has. Since I couldn't really tell, I took pics in case the BadCaps community might recognize them. Here they are:

[Lumberjack777]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

Try replacing the two caps on the logic board, use low esr caps.
http://s807.photobucket.com/user/bud...?sort=3&page=1

budm was talking about the main/logic board. That's what causes the flicker. Not the power board.

I took apart the monitor yesterday just to see which caps it has.

Ok. That's the power board. Since you have lights, picture, and on screen video. That part is working. The flickering is caused by the main/logic board. I'll attach a picture from budm where he shows which 2 caps to replace. This is through hole soldering. A bit more difficult. But feel free to ask questions on it. Just replace those 2 caps and you should be good to go

[gordesky1]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

I posted about my 281 before in another thread, But i had really bad problems, Like the display will go off and come back on and also had these 3 other problems which i still do.

3 days ago i needed a monitor cause i had to put the tv i was using as a monitor in my bedroom again, So i decided to try this beast again, So far it never goes off now and looks perfect.

But i still have the vertical lines of shimmering pixels that would rapidly "sparkle" as the thread starter said in his post. Than i have another problem that i cant adjust the brightness from 100 unless i keep messing with it and i can get it to go down. Currently at 70.

And sometimes will have wavy lines like interference. When i first turn it on from cold you can see it pretty good, But when its on for hours its hard to see but its there.

I had this monitor apart months ago and i couldn't find a problem that i can see, But it still can be a bad cap even tho its not bulged.


i wonder what cap or part that will cause these 2 issues?

Pretty much the screen is flawless other than those 3 issues.

Would like to get it perfect sense these screens are wonderful. I have a 27inch screpture 1080p which i replace this monitor with back than because of these issues and mainly when it was going on and off. And lets say that monitor cant even compare to this monitor!

[budm]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

The two caps on the main board should be replaced, see my picture of the board in post 151 above. Bad cap can look normal.

[gordesky1]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

I have a old foxcon motherboard that's bad, And the caps on it are rubycons which i did a search and saw they are decent?

Im wondering if i can use them off that to replace those 2 with?

Tho it needs to be the same voltage right 16v? So far i do see 1 16v on the board, Mostly all the others are 10v...



Edit there's couple 16vs rubycon a0640 Will those work?

[budm]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

Same or higher Voltage will be fine, the one that is connected to the output of the regulator can be 10V.

[gordesky1]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

cool As soon as i can get a solder sucker pump cause with out one its a pain in the ass lol

Was practicing on the dead board getting the bad swollen caps off i got them off but was a bit of a pain, Than trying to get the smaller caps that i need off it is pretty much impossible for me with out a pump.

The wick works but ony to a point.

Having a 30watt iron doesn't help either:/ It melts the solder tho.


Will give a update on it when i do it Hopefully in a day or 2.

thanks.

[budm]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

Adding solder to legs of the parts will make it easier to remove while moving the soldering tip back and forth between the two legs.

[gordesky1]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

just tried that now while putting very little pulling with needle noses and got 2 of the caps off that i need Thanks


Also i posted a couple cause i wanted to make sure if i did it right with out damaging the board before i start on the monitor board, Don't want to damage that.


Pretty much this is the first i did this on a board lol

[budm]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

BTW, to clear the solder holes, you can use a small sewing needle attach to a wood stick, push the needle one one side of the board while heating the opposite side with the soldering iron, to make the job easier without damaging the board is to use 50~60W iron with 3mm wide tip.

[gordesky1]

Re: Hanns-G HG281D 28" TFT - Multiple Problems

Did i do any damage to the board in the pics? i didn't bother cleaning any flux off sense the board pretty much wont get reused. Just want to make sure before i do the real deal hehe.


Yea im going to try and get a better soldering iron, Tho for some reason this 30watt one is pretty good if i leave it sit for 20mins, As soon as i touch the solder it melts. when i did what you told me pretty much the caps pretty much came right out as soon as i touch the solder.