Re: Hanns-G HG281D, LCD Monitor no power
Hi folks.
Wow, 33 pages of posts... and I spent time reading all.
OK, to the point - I have Viewsonic 2835 which has same power supply as Hanss HG281D and a bit similar main board.
I had similar issue - first it would not turn on so I have to remove power cord, put back, remove, put back until it goes on, until 2 days ago when it goes silent dead.
1 year ago I had issue with house power supply. I lost 0V cable so in every wall connector I got around 400V. Since I know why that happens, I immediately switch off whole house power supply, but while I did that, monitor release lots of smoke so whole room was full of it. Since then problems with monitor started and I think something died (maybe part of some IC's). That time varistor protected a monitor and he released that magic smoke.
So I found advises here and I give a try to fix it. A little background - I am into electronic for more than 30 years, few years worked professionally, otherwise mostly as every day hobby, so I have no issues to fix almost anything that does not require heat gun.
First I was about to replace 2 caps on main board in power supply - they were inflated suggesting they lost the value. I can measure capacitance only so I did - both are around 10 uF instead 470!! And monitor worked 3 days ago. I assume they are similar in value and position as in monitor in subject:
I had on hand 2 470/35V not low ESR so I put them instead. I put all back together, not working.
Here is where they are and how they look:
OK, then I went to change those 3 suggested in this thread, 2x22 uF and 1uF. When I took them off I measured capacitance and found 1/4 of capacitance on all.
Since I was lazy to order and wait, I took old Akai CD player, it is like 15 years old and found 2 capacitors 22uF. Measured by capacitance, they are OK (I do not have equipment to measure ESR though) and it appears they are not low ESR. Also I took one new 1uF/160V that I had on stock and replaced all 3. Put all back together, its working! It even turn off / on on every power button click.
Thanks you all! I love the picture this monitor have, actually I hate all those LED litted with cold blue picture (that cannot be set not to be bluish). I am very happy to have this thing working again!
Finally, here is what I replaced, cost is close to zero. I do not think you must use top quality capacitors although it is best to use them to avoid any future issues, as tolerance is very high. My monitor worked with above values!
And all back together in place.
Hi folks.
Wow, 33 pages of posts... and I spent time reading all.
OK, to the point - I have Viewsonic 2835 which has same power supply as Hanss HG281D and a bit similar main board.
I had similar issue - first it would not turn on so I have to remove power cord, put back, remove, put back until it goes on, until 2 days ago when it goes silent dead.
1 year ago I had issue with house power supply. I lost 0V cable so in every wall connector I got around 400V. Since I know why that happens, I immediately switch off whole house power supply, but while I did that, monitor release lots of smoke so whole room was full of it. Since then problems with monitor started and I think something died (maybe part of some IC's). That time varistor protected a monitor and he released that magic smoke.
So I found advises here and I give a try to fix it. A little background - I am into electronic for more than 30 years, few years worked professionally, otherwise mostly as every day hobby, so I have no issues to fix almost anything that does not require heat gun.
First I was about to replace 2 caps on main board in power supply - they were inflated suggesting they lost the value. I can measure capacitance only so I did - both are around 10 uF instead 470!! And monitor worked 3 days ago. I assume they are similar in value and position as in monitor in subject:
I had on hand 2 470/35V not low ESR so I put them instead. I put all back together, not working.
Here is where they are and how they look:
OK, then I went to change those 3 suggested in this thread, 2x22 uF and 1uF. When I took them off I measured capacitance and found 1/4 of capacitance on all.
Since I was lazy to order and wait, I took old Akai CD player, it is like 15 years old and found 2 capacitors 22uF. Measured by capacitance, they are OK (I do not have equipment to measure ESR though) and it appears they are not low ESR. Also I took one new 1uF/160V that I had on stock and replaced all 3. Put all back together, its working! It even turn off / on on every power button click.
Thanks you all! I love the picture this monitor have, actually I hate all those LED litted with cold blue picture (that cannot be set not to be bluish). I am very happy to have this thing working again!
Finally, here is what I replaced, cost is close to zero. I do not think you must use top quality capacitors although it is best to use them to avoid any future issues, as tolerance is very high. My monitor worked with above values!
And all back together in place.
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