Hanns-G HG281D issues
After reviewing all the posts re. no power and the associated symptoms, I replaced the caps on the power supply board. Surprisingly, still no power. What would the next step be ?
Thanks
Thanks
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Re: Hanns-G HG281D issues
what main board in it! if vx2835 r3.1 has a known issue with c124 an c126, replace them! -
Re: Hanns-G HG281D issues
Hi,
I'm new to these boards. My Hanns-G HG281D just up and died yesterday. No power and no blue light indicating power. I bought it over 3 years ago and it now out of warrant.
My model is HG281D PBUFK11.
After going over the posts here I suspect the caps are bad. My question to someone here is I also see some white stuff that kind of looks like dried glue on or near the caps and am trying to determine if it has come from the caps or not. It is all over my board in spots near almost all electrolytics and ceramic caps. Honestly, I've never seen stuff like this and am wondering if this is normal glue to hold the parts or leakage from the caps. Any suggestions are appreciated. All the electrolytics seem normal, with no bulging.Attached FilesComment
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Re: Hanns-G HG281D issues
It is normal glue. Nothing to worry about. In the main megathread, I have extensively helped people with this monitor, read through it on how to measure the voltage.
It contains almost every problem seen with this monitor.
https://www.badcaps.net/forum/showthread.php?t=11329
Note there are at least 5 or 6 other threads pertaining to the same monitor.--- begin sig file ---
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Re: Hanns-G HG281D issues
Hi,
Thanks for the quick response. I'll see what I can do about the pic's. I'll have to go find my good camera and post better picks tomorrow.Comment
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Re: Hanns-G HG281D issues
Doing this the right way ...
I re-capped the power supply board after the monitor was increasingly difficult to power on and finally wouldn't turn on at all. I measured the voltage at CN5 and the voltage fluctuates around 5v and is not stable. I don't see +12v on CN7. No blue or amber light.
ThanksAttached FilesComment
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Re: Hanns-G HG281D issues
The 5V should be steady,suggest you plug the Power supply into the mains supplyAND have NO other Boards plugged in, and then measure for the 5v output from the boardComment
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If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
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Re: Hanns-G HG281D issues
UPDATE - I ended up just replacing all the caps in the switching power supply and it seems to work. Although, it initially acted weird, the screen going black after being on for 10 seconds. then shut down. I then re-seated all the connections and tried again and it has started up the last couple of times I've tried it. I'm worried that maybe the main logic board might be flakey when it heats up so I'm doing a burn in test right now to see if it dies again.
Once again, thanks for the info on this site. You guys ROCK!Last edited by mikebe; 09-09-2012, 01:16 PM.Comment
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Re: Hanns-G HG281D issues
From the company (not eBay) website the caps that I replaced were :
qty 1 1000uf 35v capacitor
qty 2 1000uf 25v capacitors
qty 1 1000uf 10v capacitor
qty 1 470uf 35v capacitor
qty 1 470uf 25v capacitor
qty 1 470uf 10v capacitor
qty 1 22uf 35v capacitor
qty 1 10uf 50v capacitor
qty 1 2.2uf 50v capacitor
Of course, I see that the complete kit has 14 (not 10) caps and at one point I did have to choose which of (2) caps to replace. They all look to be Nichicon.
Something else, I didn't realize how delicate the etchings were for one cap (c114) until it was too late so I munged one of them. And I assume that's a pretty important one also. Probably now need a new PSM board unless I can fix that ...Comment
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Re: Hanns-G HG281D issues
follow trace to find were ya can solder a wire onto post pics makes it easier!Comment
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Re: Hanns-G HG281D issues
Well, I spoke too soon!
The monitor worked for about 4 days and just up and died again tonight! Now every once in a while the power indicator will blink bright blue once or twice and then go dark. This is now after having replaced all the caps on the power supply. When I attempt to power it on, nothing happens.
Any suggestions?Comment
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If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
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Re: Hanns-G HG281D issues
So last night I got fed up and left the monitor in what appeared to be in the off position. Black screen and no power light. Then I come downstairs today and find the monitor on and the power light glowing blue and my monitor displaying a web page. So, at this point I'm perplexed. I've turned on and off the monitor several times and it appears to be working fine now except the VGA input does not work any longer, only the HDMI input. Any ideas what may be happening now?Comment
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Re: Hanns-G HG281D issues
Check for bad solder joints on the caps you replaced. Since you damaged the solder joint on C114, try soldering a wire from the damaged lead of C114 to the next solder pad that was connected to the damaged pad of C114.Comment
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I know I've been a little scarce lately (like the last 2-3 years), but I'm still here and still doing my thing with fixing PSUs.
For today's considerations, I have a Seasonic B12 BC-550 [A551bcafh] 550 Watt ATX power supply for you (click on links for full size images).
https://www.badcaps.net/filedata/fetch?id=3591771
https://www.badcaps.net/filedata/fetch?id=3591772
It's a modern ATX unit with fixed (non-modular) cables and an 80-plus bronze certificate. Here's the label:
https://www.badcaps.net/filedata/fetch?id=359177... -
I have an old Tivo. The Power Supplies are known to have caps that fail. Here are the caps that come with the original power supply:
I could not find replacement caps with the exact same specs. I followed an online guide and recapped the power supply with caps with these specs
The power supply now works, however the HDMI video is giving me eye strain. I don't know how a capacitor on a Power supply could impact an HDMI video signal, but it does, the Tivo interface has a flicker now and the color/brightness is off. So I want to get some new caps... -
Hello,
First, I am a complete noob with high voltage stuff. I'm learning, but I need help by someone looking over my shoulder.
I recently came into posession of a Heathkit IO-4205 5MHz Dual Trace Oscilloscope. The documentation is copyright 1978. I'm told it works.
I opened it up to check the caps before I applied power, and found the following black caps and wanted to know what they were. They are on the power supply board. I was able to read the name and model and came up with, "Nytronics 162J-1, 0.1uF, 20% tolerance, 2000VDC."
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Hello!
I have two projects on my work bench. One is a friends dead JBL Xtreme speaker with a blown voltage regulator and corresponding bulged and shorted cap. That cap has clear markings so I know what replacement I need for it.
The other project however is a whole different deal. It's a Zoom 9000 guitar effect from the 90th that has developed a devil hound howl when there is no input from the guitar. I'm guessing caps problem. So, since I don't really use this effect anymore I thought it would be a perfect project to learn on.
I have studied the board and... -
I'm trying to repair two old VCRs, they both have bad caps. One has leaky ones, the other would barely run until I subbed in some caps from another power supply I had laying around (though they are the wrong values). This vcr works for an hour or two, but then the power supply starts whining and the picture gets lines in it. I didn't replace all the secondary caps, so another voltage might still be problematic, or the values I used are too far off.
I've been on mouser and digikey but the options are a bit overwhelming. I just need some new ones that will work. They don't need to be top quality,...
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