Re: HANNSPREE HF289H Black Screen No Power
What do you mean by "lifting any traces"? Without the main board plugged in, it's still reading around 4.97. I'll look over the caps again when I get home. I might resolder some of my first attempts. I was using a new soldering iron and didn't know about the tinning process until the next day. That made a huge difference. Thanks again for the help on this.
welch_41
Member
Last Activity: 07-06-2012, 06:03 AM
Joined: 06-03-2012
Location: Conway,AR
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Re: HANNSPREE HF289H Black Screen No Power
Standby is reading 2.90dcv. I rechecked my soldering job thinking that maybe a cap was lose and not getting a good connection but they all appeared solid.Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
Well I ordered replacement caps from DigiKey and replaced all capacitors on the mainboard...still no startup. It wasn't a complete bust because I've learned a lot about soldering. I think I actually enjoyed it and even pulled the old radio out of my 66 pickup for repair. Back to the mainboard, do you think that there might be something else causing the issue on the mainboard?Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
Please excuse my ignorance but how do I tell the specs of these capacitors. I've looked around the web for a clear explanation but haven't seen anything...which makes it hard to order replacements from DigiKey....Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
Thank you for the help. I will sift through that thread and the ones that run off from it. I know that people mention buying caps from digikey but is there any issue with using Radio Shack parts outside of paying a premium?Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
[COLOR="Red"]I've reverted back to my Radio Shack multimeter.[/COLOR]Re: HANNSPREE HF289H Black Screen No Power
[COLOR="Red"]I've reverted back to my Radio Shack multimeter.[/COLOR]...Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
Before I called it a night, I checked the 5vsb pin on the power supply and it was steady around 2.75dcv. However, I didn't check on the main board. I'll give that a shot today and report back.Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
Oh and it still won't turn on. Should I start looking at the main board or am I getting ahead of myself?Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
Well I got the new power supply and have hooked it up. I checked the big cap and is reading 165dcv with no source plugged in and doesn't change if I hit the power button. However, it does jump up to near 400dcv with a video source plugged in but eventually goes down to 280dcv.Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
I was hesitant on using the multimeter because it was free from Harbor Freight. For those of you that don't know what Harbor Freight is, it's a tool/hardware store that offers the cheapest items that you can buy at your own risk. I can take some pictures of the multimeter and post later. It seems fairly new without any cracks or breaks. So how would I check to see if it were fried?Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
I'm usually and optimistic but just as a safety net, I ordered a new power supply. However, I'm still going to see if I can repair this cooked unit to resale or have as a backup. I'll check the flow of electricity between the numbers that you pointed out while re-posting a clean photo of that blemish. Thanks.Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
Out of fear that I might have killed this board, I did some extensive searching and found a reseller that has a few of these power supplies available for sale. Should I go ahead and drop the coins on buying a replacement?Last edited by welch_41; 06-14-2012, 09:25 PM.Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
Good news and bad new -
I checked those fuses and they read like you expected. Then I reread the big capacitor (using a different multimeter thinking that maybe I had a bad one), huge mistake. It caused an arch and burned the board. Caught me off guard and caused the dogs to jump. I'm not sure if I fried that capacitor because now I'm not getting any reading. You can see the burn in the attachment....Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
I forgot to mention that this monitor was in a home that experienced a lot of voltage spikes.Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
I hope that this gets me a little closer to a solution....Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
I'm working on the photos for the rest of the boards. Before I started to strip it apart, I checked the big capacitor underneath the metal plate and it was reading 280vDC. Unfortunately, I can't get too close to it without desoldering the metal plate. I did try the power button but nothing happened. No blue light, no increase in voltage on the big cap, no picture...Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
Would it be best if I just start a new thread?Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
Thanks for the hint...
corrected...Thanks again....Last edited by welch_41; 06-12-2012, 09:59 PM.Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
So I tried to upload some photos but I keep getting an error message and once received a message about a missing token from the website. Not sure what the issue is but I'll update you on what I did find. I hooked everything back up and plugged it in. It's getting 120v, the power button and all other connections on that board are not getting any voltage reading. The 5VSB pin is only getting 2.5v instead of 5v. There is a yellow box(side of it reads 250v) near the 120v plug that is near the input female plug (that initially connects to the...Leave a comment:
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Re: HANNSPREE HF289H Black Screen No Power
Thank you for the quick and thorough response. As soon as I get back into town, I will take pictures of everything. I won't be able to answer anything about when the monitor died because I picked it up from someone that was tossing it out.Leave a comment:
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