Hanns-G HG281D, LCD Monitor no power

[fightforlife]

Re: Hanns-G HG281D, LCD Monitor no power

Hey, thank you for your suggestion!

i just measured the two voltage regulators. But nothin seems off to me...

The bigger one has an input of 5.1V and an output of 3.3V.
The smaller one has an input of 3.3V and an output of 1.8V.

All voltages are stable when connecting something on HDMI or pressing on/off.

Edit: PS_On (the black cable between power and main) measures 0.02V when amber led and 2.84V when display on.... somewhere in this thread was said that it had to be over 3V?!

Edit 2: It seems the powerboard is working fine. For the short time the display is on, the 24V/12V and 5V are stable.

[Lumberjack777]

Re: Hanns-G HG281D, LCD Monitor no power

You could check the 2 voltage regulators on the top left (in your picture 3)
Here's a good video explaining it - https://www.youtube.com/watch?v=cNFzBJELFoU

[fightforlife]

Re: Hanns-G HG281D, LCD Monitor no power

I hope somebody is still reading this

Problem: Always get "no signal" message when connecting or disconnecting hdmi.

I already changed all the caps on both boards.

Here are some high resolution pics:
1
2
3
4

[fightforlife]

Re: Hanns-G HG281D, LCD Monitor no power

Changed all Caps on the powerboard.
Problem persists.

[fightforlife]

Re: Hanns-G HG281D, LCD Monitor no power

So, i just changed all the Caps on the Mainboard (not the Powerboard) and the monitor is still giving me the "no signal" message.

Any ideas?
Should i replace the caps on the Powerboard?

[fightforlife]

Re: Hanns-G HG281D, LCD Monitor no power

The other two did turn on and +5VSB was stable, but did not get the signal (displayed "no signal" message). Replacing capacitors C61 and C69 on the main board (100 uF / 16 V next to a regulator) fixed them. Just a hint for other people looking for a quick fix and not wanting to spend more than a dollar for spare parts :-)

Thanks guys,
Ive just read through all posts here and came to the one above with exactly the same problem. I will change all of the caps and hope for the best!

[momaka]

Re: Hanns-G HG281D, LCD Monitor no power

^ What budm said.

Usually C80 and C83 are the caps that fail most often on the logic board. They are known to cause all sorts of issues when this happens.

You can find more info and some useful links I collected from other people in the second half of my post here:
https://www.badcaps.net/forum/showpo...&postcount=604

[budm]

Re: Hanns-G HG281D, LCD Monitor no power

"Did somebody here have this problem before, or knows which parts/boards i have to check?" The power supply board and the logic board. more likely they need to be recapped.

[fightforlife]

Re: Hanns-G HG281D, LCD Monitor no power

Hey Guys,

i just found this Thread via Google. I read some of the pager here and hope you can help me with my HG281D.

Today after updating and restarting my computer it just stopped recognizing any inputs.
Ive tested 2 Computers over HDMI and 1 over VGA. It seems to recognize when a connection is made, because it shows the green box "No signal....". But after that it doesnt show any picture and just goes back to sleep.
I never had any problem wit this monitor before!

Did somebody here have this problem before, or knows which parts/boards i have to check?

Thanks in advance!

[curado]

Re: Hanns-G HG281D, LCD Monitor no power

My HG281D runs hot and has seen daily use for 5 years now. When coming back from sleep mode or initially powering on, it would flash off/on and the speakers would make a popping sound, similar to when you switch video inputs.

Anyway, the tips in this thread helped me make a good repair w/o an ESR meter. I replaced only a few caps on the logic board. Pic attached. For replacements, I used the same exact caps it had in the first place. If I get another year out of it, I will be happy. All in all, it's been a pretty good display, although too bright!

[Toadster]

Re: Hanns-G HG281D, LCD Monitor no power

I'm pretty sure the NRSA caps are actually NIC's NRSA model. They were discontinued for NRSS, I believe.

[JonnyDee]

Re: Hanns-G HG281D, LCD Monitor no power

Yes Johnny. The traces and pads on that board lift very easily. Plus the manufacturer bends the leads completely over; making it hard to pull the lead out, without taking the pad with it. I warned of that a few times on this thread. It's a fairly detailed job, even for an experienced solderer.

A solid bridge to the proper component will work just fine. I'm hoping for positive results for you.

Good to know! ..LOL ... and how many of these have you had under your soldering gun?

Fingers & toes are (virtually) crossed.

I am thinking of having a molex connector leads soldered in to run a fan .... but I have no schematics (or meter) and the links for schematics in the thread (AFAIK) are not having correct result ..

G isnt getting me there either == only found a 'typical' PS schematic http://www.bilder-hochladen.net/file...b4-a6-6c52.jpg

Any suggestions are very appreciated.

JD

[Lumberjack777]

Re: Hanns-G HG281D, LCD Monitor no power

Yes Johnny. The traces and pads on that board lift very easily. Plus the manufacturer bends the leads completely over; making it hard to pull the lead out, without taking the pad with it. I warned of that a few times on this thread. It's a fairly detailed job, even for an experienced solderer.

A solid bridge to the proper component will work just fine. I'm hoping for positive results for you.

[JonnyDee]

Re: Hanns-G HG281D, LCD Monitor no power

All of the caps you had installed are superior to the originals. And even the inferior caps from the manufacturer lasted for years. I'd say you are good to go for many years to come.

Did the repair work? It looks like you replaced the proper caps.

Thanks for that .. it helps! When I took the PS to the store, it was pointed out that a trace had lifted on the bottom. I knew that the one I left home had 60% of the very same trace missing or lifted: that is why that it didnt go to store yet

I have a stock pic where I highlited that trace, but havent checked the image size to upload it here for comment. The area of the break has discoloration from heat I guess. Just hope there wasnt damage I cant see.

They used a jumper wire to 'repair' the trace. I will be picking up PS tomorrow and post results.

Cheers,
Jonny

[Lumberjack777]

Re: Hanns-G HG281D, LCD Monitor no power

All of the caps you had installed are superior to the originals. And even the inferior caps from the manufacturer lasted for years. I'd say you are good to go for many years to come.

Did the repair work? It looks like you replaced the proper caps.

[JonnyDee]

Re: Hanns-G HG281D, LCD Monitor no power

Sorry, I tried getting clear pix before repairs started, but none were of value to post.

I have 2 of the infamous I-inc 281D (Hans G) with psm217-404-H-R that died after having a hard time getting started for about a week. I have been trying to have fixed locally (I have carpal so hands are too shaky for detailed work). I had hopes to do by myself due to limited $, but couldnt risk doing damage.

After lots of dead ends or $50-$70/hr quotes from repair shops, I found a electronic parts store that was willing to do the work. I was told that their supplier only carried the Panasonic line of caps, so I decided to just do the 5 caps, and specified to use FC specs. After they soldered them in I was told they weren't all FC bcz the suppler didnt have them available.

All the caps put in were 105 hi temp. Only 2 of the 5 were FC. I am listing the part#s installed and datasheet links. I am hoping one of the experienced 'recappers' here can tell me if I should leave the (specific) caps in or wait until correct parts are available (2 weeks).

Specs were based on data from this post:
https://www.badcaps.net/forum/showpo...8&postcount=34


C111 - 22uf 35v EEU-FC1V22 http://datasheetz.com/data/Capacitor...atasheetz.html

C108 - 10uf 35v EEA-GA1V100B https://cdn.badcaps-static.com/pdfs/...e478c7981e.pdf

C605 - 47uf 50v EEU-FR1E4703B http://www.mouser.com/ds/2/315/ABA0000CE132[1]-293385.pdf

C606 - 1 ?? 100v ECA-2AHG010 ( ?? = cant figure out value from post) https://cdn.badcaps-static.com/pdfs/...c6081238c1.pdf

C603 - 22uf 35v EEU-FC1V22 http://datasheetz.com/data/Capacitor...atasheetz.html

Thanks much in advance for responses!

Jon

[mj2301]

Re: Hanns-G HG281D, LCD Monitor no power

Jimmy,

You should redo some of the solder work. I see some in the pictures where solder could be bridging and some places where there is not enough solder, especially on the main board.

[jimmy1256]

Re: Hanns-G HG281D, LCD Monitor no power

[QUOTE=jimmy1256;517346]OK. I've read all of the pages up to this point, even found the exact problem described that I have. Hanns-G 281D Rev.2. From a cold start the monitor turns on and works fine for about 3 minutes. Then black. LED indicates that its getting a signal from the computer. Using a flash light shows no image. Turn it off/on and I get the image back for about a second. So far I have replaced all of the caps on the power supply and the main board. No change. (probably not a cap issue) Not sure where to go next and am feeling a bit dejected that the caps didn't fix the problems. Any body have an idea what to do next?

Thanks for the replays to my original post. Sorry I didn't get back sooner. I was frustrated at this repair and the holidays didn't help either. Anyway, I disassembled the monitor again and checked for the voltages. go the 5.0 volt line but that is all I can get. There is not enough wire to keep everything plugged in and be able to reach to measure the voltages. I took pics of the boards here.

Any help is appreciated. Thank you.

[ratty]

Re: Hanns-G HG281D, LCD Monitor no power

Thanks Lumberjack, I replaced the 7 caps on the PS and the 2 on the main board. My I-Inc iF281D is working again. For the last few months the monitor would start but go black while Windows loaded for about 2 minutes then operate normally. Sometimes the desktop would overlay on each other but after a few minutes one of the overlays disappears. Thought it was my vid card till I turned off the monitor and it would not turn on again. The screen was losing its brightness for that last few years, now its back to like new brightness after the cap replacement.

[selldoor]

Re: Hanns-G HG281D, LCD Monitor no power

I cleaned the lvds cable with Clin (window cleaner with alcohol).


Unfortunately I cannot test the voltages, because I do not have any instrument.

OK - Not sure about Yageo caps? Try warming them with a hair drier see if
it helps the pixels.

Also I think Clin will leave a residue - usually suggest isopropyl alcohol for cleaning electronics.

We are a sort of stuck if you dont have a meter - that is often the first question we ask