Re: Dell U2312HMt garbled display
No, I did not manage to repair it.
dethica
Member
Last Activity: 04-01-2021, 05:12 PM
Joined: 12-05-2013
Location: Rockvere
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Re: MSI MS-10571 no power through DC
I found a donor board with the same K702 component and same DC jack, replaced them both. Still not powering up.Last edited by dethica; 04-01-2015, 12:23 AM.Leave a comment:
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MSI MS-10571 no power through DC
Hi,
I got a laptop which works fine on battery, but will not charge or work through the DC jack.
There is a slightly loose (physically damaged) component right behind the DC jack, but I could not find any info on it. The marking on it is K702. I soldered it a bit, to make sure it makes contact, but it didn't help.
The DC jack seems to work fine - nearby components are getting voltage, but the MoBo won't turn on without the battery.
Any help with this motherboard will be appreciated.... -
Re: Dell U2312HMt garbled display
I tried heating the caps just a bit by touching them with the tip of a soldering iron. They got warm, but didn't seem to stop the glitching. After that, I had no luck getting the screen to glitch for a whole day or so. I put the protective metal case back on and it started glitching again after 10 minutes.
I also noticed that "cap group 1" on budm's picture got slightly warm (when monitor was turned on), while all the other caps seemed cool to the touch.Leave a comment:
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Re: Dell U2312HMt garbled display
The fuses are ok, no resistance (monitor off) and 5.15v when USB device was plugged in (monitor on), so they're only there for the USB.
The 1117-33 regulator is okay too, it only works when USB was plugged in, the readings were:
- 0V
- 3.3V
- 5.15V
So I guess the only thing left to do is to check the caps by heating them, but that only works when the display is garbled, right? When the image stabilizes, I cannot test it?Leave a comment:
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Re: Dell U2312HMt garbled display
I didn't try heating the caps yet, it was just very warm in the room.
I am still a noob with the multimeter - how do I go about testing the fuses?
I will try to hook the USB up to a PC and plug something in there to see if the 3rd regulator gives any readings....Leave a comment:
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Re: Dell U2312HMt garbled display
i tested the regulators:
N521
-- 0V
- 3.3V
-- 5.16V
UTC
-- 0V
- 1.2V
-- 3.3V
the supposed 1177-33
- 0V
- 0V
- 0V
Am I doing something wrong with the 3rd one? I couldn't get any readings from it at all.
I measured the regulators several times.
Also, the image stabilized after a while, then occasionally became garbled again and then stabilized again.
How much heat are we talking about with the caps?
...Leave a comment:
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Re: Dell U2312HMt garbled display
I recorded a short video:
[url]https://www.youtube.com/watch?v=yCXnIvf5IRM[/url]
I have also attached a photo:Re: Dell U2312HMt garbled display<br...ached a photo:Re: Dell U2312HMt garbled display
I recorded a short video:
[url]https://www.youtube.com/watch?v=yCXnIvf5IRM[/url]
I have also attached a photo:...Leave a comment:
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Re: Dell U2312HMt garbled display
It was something similar to this:
[url]http://www.youtube.com/watch?v=Oh-7-6Yb0Oc[/url]
There was like a vertical interlaced effect everywhere, image was cut into pieces and was jumping up and down, like in that video.
I will assemble the monitor in the morning to take a picture and check out the voltage regulator readings.
regulators:
UTC
LD1117AG
12A01PAT2
[url]http://html.alldatasheet.com/html-pdf/453858/UTC/LD1117/112/2/LD1117.html[/url] - supposed to be the 1.2V 1A variant....Leave a comment:
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Dell U2312HMt garbled display
The screen works normally for about 5 minutes and then screen goes crazy: stripes, patterns etc.
The monitor is a relatively new model, I couldn't find any service manuals or schematics on this, and nobody seems to have similar problems with this model (yet!). Warranty is not an option, so I have to find a way to repair this myself.
Examining the logic and power boards, I could not find any bulging caps or bad solder joints on the caps.
I have repaired 2 other LCDs by replacing bad caps, but I don't know which ones to replace here, because they all... -
Re: New Members - please post your introductions here
Hi guys,
I repair stuff as a hobby, but just lurking these forums for info is no longer enough, now has come a time to post!Leave a comment:
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