Hanns-G HG281D, LCD Monitor no power

[Capt. Cap]

Re: Hanns-G HG281D, LCD Monitor no power

For what it's worth, a polypropylene film 1μF 100v capacitor has been working fine in place of the electrolytic.

[Capt. Cap]

Re: Hanns-G HG281D, LCD Monitor no power

ugh, looks like a selection error on my part. thanks, good catch.
slim pickings for 1uF 100v caps.

Yeah, I looked at that 1μF 100v first to see what you were going with because of the slim pickings
In another thread I started about the HG281D I asked about using a film capacitor there, but I think the question got lost in that wall of text.

In all likelihood, they chose to use an electrolytic there because it was cheaper, but I don't understand the circuit at all, so I'm hesitant to get fancy with the replacements.

[acabtp]

Re: Hanns-G HG281D, LCD Monitor no power

after a little more research and checking the board, i think that
https://www.digikey.com/product-deta...719-ND/5051848
can probably squeeze in there and do the job with much better lifetime rating. i'm going to order this and the UCC as a backup in case i can't fit it.

[acabtp]

Re: Hanns-G HG281D, LCD Monitor no power

Thanks for posting the nice spreadsheet, was putting together a similar order myself.
What's up with the bipolar capacitor at C606?

ugh, looks like a selection error on my part. thanks, good catch.
slim pickings for 1uF 100v caps.

couple options:
https://www.digikey.com/product-deta...0-1-ND/4320420
https://www.digikey.com/product-deta...1360-ND/755876

i would lean towards the nichicon, but the UCC has better high freq ripple current. neither have ESR data. decisions decisions...

[Capt. Cap]

Re: Hanns-G HG281D, LCD Monitor no power

google docs spreadsheet with clickable digikey part links https://docs.google.com/spreadsheets...Sa-c6i80S9MSGA

I am fine with the soldering and repair work for the monitor, but I was hoping that someone could please look over my component choices? And if necessary point out the error in my ways? Thanks!

Thanks for posting the nice spreadsheet, was putting together a similar order myself.
What's up with the bipolar capacitor at C606?

[acabtp]

Re: Hanns-G HG281D, LCD Monitor no power

That list looks alright, acabtp.

Like you mentioned, there is no point to use two different sizes of 100uF caps if size constraints are not an issue. So it's perfectly okay to go with 5x12mm.

That said, if it was me, I'd streamline the order even further.

For example, all those different 10 uF caps, I'd just go with 10uF/50V/5x12 mm Panasonic FC for everything. Being low ESR and bigger in size, they should also last longer.

sounds good. hopefully i'll report back in a week or two with a fixed monitor. thank you!

[momaka]

Re: Hanns-G HG281D, LCD Monitor no power

That list looks alright, acabtp.

Like you mentioned, there is no point to use two different sizes of 100uF caps if size constraints are not an issue. So it's perfectly okay to go with 5x12mm.

That said, if it was me, I'd streamline the order even further.

For example, all those different 10 uF caps, I'd just go with 10uF/50V/5x12 mm Panasonic FC for everything. Being low ESR and bigger in size, they should also last longer.

[acabtp]

Re: Hanns-G HG281D, LCD Monitor no power

Hello. I have a HG281D that works fine for a few minutes then the power starts dropping out and screen goes black... no visibly damaged components or bloated caps, seems to be in line with the experiences others have had. I wish to replace the capacitors. After checking my actual boards (PSM217-404-H-R & PM549DA3 M06 ver5.0A) and reading the recommended caps lists and bad caps lists I came up with the following replacements that are in stock at Digikey.

Main Board (PM549DA3 M06 ver5.0A)

Qty	Cap	Voltage	Dia	Hei	Rep Part
3	470	16	8	12.6	EEU-FM1C471L
12	10	16	4	6	EEA-GA1C100
3	100	16	6.5	6	
2	100	16	5	12	EEU-FR1C101

I don't see a reason that they had to use the two different sizes of 100uF caps, so I was just going to replace them all with the 5x12mm ones. The eBay/Amazon cap repair kits for this board that I have found do the same thing.

Power Board (PSM217-404-H-R)

Qty	Cap	Voltage	Dia	Height	Labels			Rep Part
1	1	50	5	12	c205			50YXF1MEFCT15X11
1	1	100	5	12	c606			UEP2A010MDD
2	2.2	50	5	12	c114, c203		EEU-FC1H2R2
1	10	35	5	12	c108			UPW1V100MDD1TD
1	10	50	5	12	c406			EEU-FC1H100L
3	22	35	5	12	c111, c603, c707	EEU-FC1V220
1	22	400	12.5	21	c601			UCS2G220MHD
1	47	50	6.5	12	c605			EEU-FC1H470
1	150	420	20	40	c3			450QXW150MEFC18X40
2	470	10	8	12	c506, c702		EEU-FM1A471
2	470	25	10	16	c306, c502		EEU-FM1E471
1	470	35	10	20	c403			EEU-FM1V471
2	1000	10	10	16	c505, c701		EEU-FM1A102B
2	1000	25	12.5	20	c301, c302		EEU-FM1E102
1	1000	35	12.5	20	c401			EEU-FM1V102B

google docs spreadsheet with clickable digikey part links https://docs.google.com/spreadsheets...Sa-c6i80S9MSGA

I am fine with the soldering and repair work for the monitor, but I was hoping that someone could please look over my component choices? And if necessary point out the error in my ways? Thanks!

[e76nystrom]

Re: Hanns-G HG281D, LCD Monitor no power

Thanks for the help. I will order those and give it a try.

[momaka]

Re: Hanns-G HG281D, LCD Monitor no power

I have decided to replace the capacitors and have found all the capacitors 22uf and above from DigiKey, but am having trouble finding the following:

c114 2.2uf 50v
c406 and c108 10uf 50v
c606 1 uf 100v

I can find capacitors with the right capacitance and voltage rating, but none in the series that recommended and none with a specification for ESR.

Hi e76nystrom, welcome to the forums!

Here is a more comprehensive list of capacitors suitable for PSU use:
https://www.badcaps.net/forum/showpo...22&postcount=9

With that said, the following caps should be okay:

for 2.2uf 50v:
493-1887-ND
https://www.digikey.com/product-deta...1887-ND/589628

for 10uf 50v:
493-11421-3-ND
https://www.digikey.com/product-deta...1-1-ND/4319977

for 1uf 100v:
493-1962-ND
https://www.digikey.com/product-deta...1962-ND/589703

On the control board there are 23 100uf 16v capacitors. I have also been unable to find a good replacement for these. Are these likely to have failed?

If they are near "hot spots" such as heatsinks and linear regulators (i.e. 1117 or similar), then they might have dried up.

Again, Nichicon PW, Panasonic FC, and Chemicon KY should be okay to replace those. If you need links, let me know. Otherwise, I will let you search for them as an exercise/homework.

[e76nystrom]

Re: Hanns-G HG281D, LCD Monitor no power

I am trying to repair an HF-289H monitor with a Phihong PSM 217-404-H-R power supply like the one pictured in this link: https://www.badcaps.net/forum/attach...8&d=1435812326

I have done some trouble shooting on the monitor. I have 5v on the 5vsb line with the control board unplugged. When a supply power to the control board the 5vsb line falls to around 2.5v.

I have decided to replace the capacitors and have found all the capacitors 22uf and above from DigiKey, but am having trouble finding the following:

c114 2.2uf 50v
c406 and c108 10uf 50v
c606 1 uf 100v

I can find capacitors with the right capacitance and voltage rating, but none in the series that recommended and none with a specification for ESR.

Are there any recommendations for these?

On the control board there are 23 100uf 16v capacitors. I have also been unable to find a good replacement for these. Are these likely to have failed?

[nolse]

Re: Hanns-G HG281D, LCD Monitor no power

This is c82 was hs.
thanks.
now the screen turns on but there are red dots everywhere.
The tensions are good.
An idea?

[budm]

Re: Hanns-G HG281D, LCD Monitor no power

There should be SMD MLCC (Multi Layer Ceramic Cap) about 0.1 uF connected in parallel with the electrolytic cap that is connected to the output pin of that regulator also, did you remove that MLCC to see if the low resistance will go away?

[nolse]

Re: Hanns-G HG281D, LCD Monitor no power

regulator vs18 : 1 ohm between output and groud
and regulator not on pcb 700 ohm

[budm]

Re: Hanns-G HG281D, LCD Monitor no power

So how many Ohms is at the output pin? <10 Ohms?

[nolse]

Re: Hanns-G HG281D, LCD Monitor no power

Hello
I have a screen hg281d down.
At the start, it cycle on red blue green.
I replace c80 & C83.
I do not have 1.8V to regulator vs18.
The output is short-circuited with ground.
The regulator is ok, the capacitor is ok.
I do not have the schema to find or is short circuit.
If anyone had the schema.

thank you

[momaka]

Re: Hanns-G HG281D, LCD Monitor no power

I'd like to change the capacitors as It's been advised in this thread, but also noticed an issue on the back of the power board, on Capacitor C404 which appears to be burned.

I've searched this thread but it doesn't look like this has been mentionned before so I'd like to ask you what kind of capactior I'd need here (is it a Capacitor ?) as this looks really tiny.

Could you post some pictures of that? I don't remember off the top of my head what kind of capacitor C404 is. If it's a small tan square/rectangle one, then that will certainly need replacing as it may be shorted. But again, I think it's better we see some pictures first of your board before jumping to conclusions.

[poltrob]

Re: Hanns-G HG281D, LCD Monitor no power

Hi Everybody,

I am a long time owner of the Hanns G and have experienced problems for years, usually the monitors takes 5/10 minutes after I've turned it on to show picture, after which it's stable.
This week I tried to turn it on but didn't get anything at all from the power led.
I started looking for ways to fix it and happened upon this great Thread !
I have now taken the screen appart and had a look. I'd like to change the capacitors as It's been advised in this thread, but also noticed an issue on the back of the power board, on Capacitor C404 which appears to be burned.

I've searched this thread but it doesn't look like this has been mentionned before so I'd like to ask you what kind of capactior I'd need here (is it a Capacitor ?) as this looks really tiny. Or will it work even without this maybe?

Thanks a lot for your help,

[demoncamber]

Re: Hanns-G HG281D, LCD Monitor no power

I made my own thread

[morozm]

Re: Hanns-G HG281D, LCD Monitor no power

Dear Forum participants! Need power supply circuit monitor Hanns g 281d.
I will be grateful.