Hanns-G HG281D 28" TFT - Multiple Problems

[tom66]

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

The one which has the plug connection on it or leads to the plug.

[NeilH]

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

I've got the back off and the metal box with the electronics,.
there's two PCB's is it the large on I need to look at?

[NeilH]

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

Sorry, I misunderstood, I'll give that a go now

[tom66]

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

I can afford the capacitors, it's just a new monitor that would be a problem but thank you very much.
Could you advise me of which caps I need to order, I don't have a clue which ones need replacing either but I guess I can tell when I have the new ones as I guess they will be very similar to the ones on the pcb.

I would advise you open your monitor up and report the caps used. Manufacturers have been known to change components in different production runs, even use entirely different power supplies.

[NeilH]

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

I can afford the capacitors, it's just a new monitor that would be a problem but thank you very much.
Could you advise me of which caps I need to order, I don't have a clue which ones need replacing either but I guess I can tell when I have the new ones as I guess they will be very similar to the ones on the pcb.

[tom66]

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

I understand, what if I leave it on and just let it power down when I turn off the computer, will it last any longer?

No, not really. You will potentially end up with the issue some users have with Samsung TVs. The EEPROMs get corrupt and all the configuration data gets screwed up and then the TV requires an EEPROM reset. At least on Samsung TVs that is easy, but I don't know about monitors too much.

Also how difficult is it to change the capacitors, I could possibly borrow a soldering iron and there is a Maplin store close where I could get them.
At least it's working now, any more use is a bonus until I get some spare cash in.

A Maplin "fire-starter" (mains plug on other end, no temperature control) iron is fine for the job, or you can borrow one. I bought a spare for £7. 25W or more is fine. DO NOT buy capacitors from Maplin - they are not low ESR (I have tried before, they are useless nowdays for components.) Caps which are not low ESR will fail shortly or possibly not work at all. They are also much more expensive!

I expect another week or maybe a month out of your monitor if you're lucky.

Open your monitor up. If you are strapped for cash let me know what caps you need and I'll add them to a Farnell order I'm making, they are 50p or so each.

[NeilH]

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

Thanks, I'll do that
Also i forgot to ask, what caps should I get and how many are there, I can't find it mentioned in the thread?

[robehickman]

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

Changing caps is pretty easy, just do them one at a time and make sure you get the polarity right. Also look up basic soldering techniques.

[NeilH]

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

I understand, what if I leave it on and just let it power down when I turn off the computer, will it last any longer?
Also how difficult is it to change the capacitors, I could possibly borrow a soldering iron and there is a Maplin store close where I could get them.
At least it's working now, any more use is a bonus until I get some spare cash in.

[tom66]

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

The fix will not be permanent! You will need to replace the capacitors soon, as you will only get maybe a month or so out of it with this technique.

[NeilH]

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

I registered to say a huge thank you to everyone in this thread but to Mikeley in particular.

I had the problem where I couldn't restart my Hanns-G and was convinced that it was gone for good but decided to look on the internet just in case and came across this thread.
As I haven't got the skill or equipment to fix the capacitors mentioned I was relieved to see Mikeley's suggestion of warming them. Nervous about opening the case I removed the stand and rested the monitor against the radiator and after about a half hour, to my delight, it came back on.

So thank you so much for the advice, you have saved me buying a new monitor which at this time I could barely afford.

Kind regards,

Neil.

[Bartman]

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

It could be a number of problems causing this - as you say caps could be one and it could be the power supply the main board or both. It could also be the voltage regulators.
First thing perhaps would be to remove and reseat any connectors especially if their is a flat one to the panel which might need a clean.
Have you tried a different hdmi cable..
Have you tried it with a different pc.
As it says these run on the hot side so even if caps have no visible damage they could
still be dried out. As it is a 28 inch screen has to be worth investing in good new
caps. Start with the power supply and if no improvement test the voltage regulators
then re cap the main board. If you didnt want to do all the caps on the main board I would start with the ones near to the voltage regulator.

Thanks for the advice. I will try your suggestions.

Regards, Bart.

[selldoor]

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

It could be a number of problems causing this - as you say caps could be one and it could be the power supply the main board or both. It could also be the voltage regulators.
First thing perhaps would be to remove and reseat any connectors especially if their is a flat one to the panel which might need a clean.
Have you tried a different hdmi cable..
Have you tried it with a different pc.
As it says these run on the hot side so even if caps have no visible damage they could
still be dried out. As it is a 28 inch screen has to be worth investing in good new
caps. Start with the power supply and if no improvement test the voltage regulators
then re cap the main board. If you didnt want to do all the caps on the main board I would start with the ones near to the voltage regulator.

[Bartman]

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

Hi all,

I have read all comments with much interest. Thank you for sharing.

I am facing the same problem as many of you. When I connect the HDMI cable between my laptop and HG281D screen I get screen blanks (with VGA no screen blanks, but some flickering especially with white backgrounds). After a while the blanks disappear and everything appears to be working just fine. Every time I close down and restart, I get the same issue. From the comments on the forum I concluded that it is the logic board (although I am not sure, could also be the power supply). I checked the capacitors visually to see if any of them is bulging out. This appears not to be the case. My question is now: Which capacitor(s) do I have to replace to get my screen not to blank at startup and after?

Thanks a lot in advance.

Regards, Bart.

[stevekasian]

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

Good luck slowcorrado!!

[stevekasian]

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

Good luck slowcorrado!!

[stevekasian]

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

I would wish you luck... but based on the last PM I received from you, you've already had 100% luck and have fully repaired your HG281D! Very nice!! Congratz!

Glad to have been of help,
SK

[slowcorrado]

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

New user here. Just wanted to thank everyone for their excellent advice. I recapped my power supply and now have a "more working" monitor. :-) I still have lots of screen noise and it will sometimes go dark, so it looks like I'll need to recap the logic board. Wish me luck!

[sheep68]

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

just found this forum with the aid of google

Had problems for a few months with my HG281D
Like Teddyv (post #73)
"I also starts up when I turn it on and takes a while for the image to show up, Although the image shows up well it starts to flicker from the bottom part of the monitor and then vertical lines appear to shimmer and dissapear". although mine seems to shimmer constantly and flicks on and off all day lol

Not had the case open yet as i am trying (without hope of success) to get HannsG to cover it under the warranty and it seems no shop in Reykjavik will touch it. Some great advice on the thread and i will use this info to aid seeking a genius to actually do the fixing.

[maxtech]

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

I would like to thank all of the contributors in this thread. I am a new member and I know that there are thousands out there suffering with the Hanns G. I have been repairing electronics most of my life and hope to contribute here in this forum. Looks like it's time to go pick up some new caps and get to work.