Re: Hanns-G HG281D, LCD Monitor no power
I'm reading it as he doesn't have the know how or equipment to do the fixing (soldering and stuff) which is why he's asking if someone else could repair it for him.
mooses
Member
Last Activity: 10-04-2022, 07:17 AM
Joined: 12-26-2011
Location: London
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Re: Hanns-G HG281D, LCD Monitor no power
Thanks retiredcaps, also bookmarked.
I just found out why my tip was wearing away....Leave a comment:
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Re: Hanns-G HG281D, LCD Monitor no power
Silly me I should have looked around the board a bit more to find them.
Even though the video is old and it's not in HD on youtube the videos are still clear to see and understand.
I've learnt so much in just that one video than what I understood from various videos on YouTube....Leave a comment:
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Re: Hanns-G HG281D, LCD Monitor no power
Well my face is like this right now ->
I replaced some caps on the power board and now the monitor is working and powering on fine. Still yet to test it for longer periods but it's looking good so far.
I did damage a few traces being lazy and trying to rush it plus I should have used a better soldering tip, however I managed to fix them by using a few wires to reconnect them.
I found this youtube video very helpful, made me realise I should get a better soldering iron and tips suitably sized...Leave a comment:
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Re: Hanns-G HG281D, LCD Monitor no power
Confirmed, if looking at the board with the Phihong Logo at the top right corner (REV A1 also).
I've just made a diagram of all my caps and polarity order of both boards so I can order replacement ones....Leave a comment:
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Re: Hanns-G HG281D, LCD Monitor no power
I've still got it, I was planning to solder it back on or do I need a new one?
Haven't got to doing the hair dryer trick, have to set up the monitor so I can see it and have access to the back to blow the hair dryer on it but it's been tricky.
Searching for an ESR meter online the lowest price I can find is one for £85
If I had to repair lots of monitors I'd definitely get one.
Reading that post by retiredcaps selldoor. Will do the tests on the mosfets...Leave a comment:
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Re: Hanns-G HG281D, LCD Monitor no power
Q501 and 502 are the same part number
FR3707Z on the first line, I then it has a diode symbol and RP745G
and then M6 F1
The last character is a 1 not a T as I mistakenly posted previously.
The Q601 only has DF RW and the circle in the middle of it is too small to read even with a magnifying glass.
Also managed to take the heatsink off by removing that blue resistor. All the caps look fine to me.
I was actually hoping to find a bulged...Leave a comment:
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Re: Hanns-G HG281D, LCD Monitor no power
Here's those pictures I promised.
I'm going to have to unsolder that blue rectangle item at the end to get to the screw on the mosfet so I can remove the rest of the heatsink....Leave a comment:
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Re: Hanns-G HG281D, LCD Monitor no power
Hi selldoor,
Will post pictures tommorow when there's more light to take some.
Q601 has DFRW printed on it.
Q501 has FR3707Z on the first line, I then it has a diode symbol and RP745G
and then M6 FT on the last line.
As for getting the heatsink off if you look at the third picture on the right where the blue part is under the green thing (sorry I don't know what they're called) there is a screw through a flat black thing soldered onto the board.
That screw...Leave a comment:
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Re: Hanns-G HG281D, LCD Monitor no power
I was pointed to here by retiredcaps (in [URL="https://www.badcaps.net/forum/showthread.php?p=231300"]this thread[/URL]) and I've just opened my monitor (HG281D Made in Jul 2008) and taken pictures of the power board.
That square black thing (is it a transistor?) at Q601 on the bottom side, in the middle at the side of the board seems pretty darkened.
Is it perhaps that which is causing my monitor to not switch on properly?
All the capacitors look fine and I can't see any bulges.
...Last edited by mooses; 06-06-2012, 06:30 AM.Leave a comment:
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Hanns.G HG281D Monitor - Cycles on and off randomly
This monitor is 3 years old now and the problem I have with it is when it goes to sleep (computer off no video signal) it will sometimes turn itself on (LED Blue) and then go into standby (LED Orange) and then switch off (No LED light).
It'll just cycle through that while it's plugged in and left on.
However when I want to use it, if the LED isn't blue at the time it can take up to 20-30 minutes for it to turn on by itself.
Once the monitor is on it works fine and there are no problems until I turn off the PC or the monitor goes to sleep.
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