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


@retiredcaps: I tested the voltage on all the caps and put my notes into one image file. See attachments. Many of the caps have 0V, and only ONE has 3.5millivolts. What could that mean?
Sorry about the chopped-up pics I posted before, I thought those might be useful. This time I've got full top-down pics.


@stevekasian: Capacitors have a polarity, meaning a positive and negative terminals? How can you tell which is which? Does that line down the side indicate it? Also, thanks for the list of...

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


Thanks. It seems to be working fine.


I tried again with the ground at the hole next to the outputs, but still get zero at the 24, 12, 5 and 5SB(?). What could cause that? Can capacitors do it?



Done. New pics attached.


Can I still do the hair dryer test? I've got the monitor all taken apart. I guess I only need the ON light to ignite to know if it works or not... I'll try tomorrow.

[B]New question:[/B] I hope it's just the capacitors,...

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

Took monitor apart. Checked to see if voltage was reaching the power board, it measured 230V. Checked on the other side of what I believe is a fuse (marked F1 on board, see picture), and it measured 230V also.

I'm not sure I'm doing this right, but I also checked the outputs that are marked 24V, 12V and 5V, but they all measured 0V. Am I right to measure the output voltage in volts DC? Also, I connected the meter to the main negative coming in from the wall.

I hope the pics are okay. I can take more....

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

Oh, the monitor accepts 110 or 220V, so I found a computer power cord with a european plug on it and have been using that. Much better than using those cheap-o american to euro adapters. I'll post pics tomorrow... we are 5 hours ahead of eastern time, so it's time to sleep here.

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



Didn't know what ESR was, but Wikipedia solved that. From what I gathered, the ESR is the resistance in the capacitors in question. When they are cold, the resistance is SO high, that the monitor won't start?
I like the idea with the hair dryer. I'm going to give it a shot tomorrow when I can take it down to the storage unit and work on it. The kids can't get their hands on it down there.
Mikeley, I have NO indication of power. My wife and I took turns trying to get it to come on by pressing the...

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

Hello all... I am brand new to this forum, and a novice with electronic repair. But I have the EXACT same monitor as stevekasian, the Hanns G HG281D 28" monitor, min was manufactured Sept 2007. Mine also has the EXACT same problem. Over time, it's gotten less likely to turn on from completely off mode (no light). Once it's on... beautiful! Works fine, can go from On to Standby without problems.
The last time we got it started, we left it on for at least three or four weeks. Then, it got turned off by a power outage...