Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
Thanks for the reply! It had been awhile since the last one, so I figured everyone was out of ideas! However, I've decided to sent the laptop into the repair lab. Since we know there's some kind of problem with the GPU, which is something a bit beyond the abilities of home repair.
Anyway, within hours of receiving the laptop, they've tested it and discovered the following symptoms:
[LIST][*]Scratches on the mainboard.[*]Missing screws (I also discovered this when I went to re-assemble...
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Last edited by fireaza; 11-16-2018, 01:54 PM.
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
OK, I've removed pjp302 pjp304 pjp305, but I still get 7 beeps when I try to boot.
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
Not PJP601, PJP600. After I removed this solder bridge, (and also cleaned up the solder mess on UH3 and re-soldered the components I had removed before) the LED on the AC adapter stayed on when it was plugged in.
*EDIT* (I didn't see you had edited your post!) I've found pjp302 pjp304 pjp305, but are these correct solder bridge to remove if my problem solder bridge was PJP600 and not PJP601?Last edited by fireaza; 10-23-2018, 05:46 AM.
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
Sounds like it's important!
OK, I've here's the voltages:
UH3: 3.28v (on pin 1 & 5, nothing on the other pins) (multimeter set to 20v)
The next components are bit tricky, since they're under the heatsink and only one solder point of each component is exposed. Also, I can only see the label for PL502, the labels for PL503 and PL504 are covered by the heatsink! But from what I can recall, PL503 and PL504 are the two SMT power inductors next to PL502. Anyway, here's...Last edited by fireaza; 10-23-2018, 02:05 AM.
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
This is apparently the schematics for my board:
[url]https://www.badcaps.net/forum/attachment.php?attachmentid=175850&d=1524883267[/url]Re: Laptop's AC adapter turns off wh...24883267[/url]
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
Ah, I see. Would it be the GPU or CPU? If it's the GPU, that would line up with what was said before about there probably being a problem in the graphics area of the board.
Is the vcore something we've already tested in this motherboard? It sounds familiar. If not, after we've finished testing, would fixing the problem be a simple matter of replacing a dead capacitor, MOSFET etc or are are looking at something more complicated, like a BGA?
Oh, and before I forget, there's...Last edited by fireaza; 10-22-2018, 01:15 AM.
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
I fully re-assembled the laptop and tried plugging it in and turning it on. The laptop lights up! It doesn't boot though, and nothing appears on screen, it just beeps 7 times. Google seems to indicate that 7 beeps means a RAM problem, so I've tried swapping which DIMM the RAM is installed in and even booting with no RAM, but it still beeps 7 times.
[URL="https://www.dell.com/support/article/us/en/04/sln302962/alienware-13-r2-15-r2-and-17-r3-7-beeps?lang=en"]THIS GUIDE[/URL]...
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
OK, I soldered those SMT power inductors back and did a partial assembly, by plugging the AC adapter and battery back in. I plugged in the AC adapter, and while it LED didn't go out, there didn't seem to be any sign that the battery was being charged (i.e the AC adapter or battery didn't get warm). Apparently with this laptop, the charging indicator is the power button on the keyboard, so I plugged in the keyboard too, but the power button didn't light up.
Does the entire laptop need...
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
Ah, so you're saying if we can get the laptop to switch to integrated GPU, and it start up, then the short is with the discrete GPU? Is the "PJP" point you mentioned the "PJP600" solder bridge we removed before? How about the ripped solder pad on that chip I showed you before? The laptop won't boot with that not fixed, will it?
Yes, I mentioned this before, but after re-soldering the components we removed (MOSFETs etc) and those two solder bridges, I connected the...
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
Sorry, I thought I explained it clearly!
Oh, I thought the fact that the different probes give different results was useful, so I thought I'd tell you which happens with different probes.
Hmmmm, if the short is in the graphics chip area, does that mean the short is probably in the GPU itself? That's probably not something someone with a soldering iron can fix, is it? Where do you think we should go from here? Should I give up and leave this to a professional electronics...
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
OK, I've removed PL601, PL602 & PL603!
Though, I accidentally confused PL601, PL602 & PL603 with PL501, PL502 & PL503 and removed them first! From what I've read, these components are "SMT power inductor" and have no polarity, so you can solder them in any direction. I've re-soldered PL501, PL502 & PL503, so hopefully there's no problems!
Anyway, here's the readings I'm getting:
PL601 right solder pad (as in previous photo) - beep and "-001"....Last edited by fireaza; 10-17-2018, 04:52 AM.
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
OK, I'll try that tomorrow!
Also, just checking, when you said "PR603" you didn't mean "PL603", right? I just want to be sure I tested the right component! If it helps, PL601, PL602 & PL603 are all beeping with "1" when I check continuity to ground.
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
Got it! Also, you were right! I re-soldered PQ707, PQ701 & PL100 (and the two solder bridges nearby) and I was able to plug the AC adapter in without the LED turning off! Progress!
PL601 - Multimeter beeps and displays "1". Same thing happens on both the red and black probes as well as both sides of the component.
PR603 - With black probe on component and red on ground, it beeps for a moment then displays "432". Both sides of the component give...
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
Hooray! Sounds like we're making progress!
PL601 being this component here?
Does it need to be removed from the board like PL100 in order to test it, or can it be tested without being removed?...
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
OK, I've cleaned up that mess on the back of the motherboard and cleaned up the messy solder on that chip.
From what I can see, it looks like whoever was trying to fix this board previously pulled one of the pads off the mainboard, since that brown part looks like bare silicon to me. Any idea where this pad would be connected to? It seems like the trace runs under the chip......
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
Hmmm, where do you guys think I should go from here? I'm a bit concerned about that mess on the bottom of the motherboard. Is this likely to be a problem when it comes to fixing this motherboard? Or will I discover if it is or not after further diagnosis with kodox's solder bridge probing method or using a PSU like dellxps15 recommended?
OK then. So both round solder bridges need to be removed then?
*EDIT* Ah! I think I've found something! I removed the PJP600 solder...
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
Tell me about it! I'm starting to feel like I quicker solution would be nice! Would a PSU really be that quick and easy? Would one like this do?
[url]http://amzn.asia/d/1nYcelN[/url]
It's ¥7,999 which isn't too bad when you consider that getting this laptop sent to a professional repair lab would cost around ¥26,000.
Oh, I've been focusing on the wrong solder bridges? OK, I'm trying to find the bridges you mentioned. I've found...
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
OK, here's my results:
PJP200 solder bridge removed = PL100 top pin still beeps
PJP300 solder bridge removed = PL100 top pin still beeps
Then there's PJP302... It's very strange, no matter how clean I get this bridge, there's still continuity across it! Here's a photo:
My guess is those two little solder blobs marked "PJP304" and "PJP305" are bridging the same thing that PJP302 is. But your instructions said...
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
Oh, OK.
There's a few PJP solder bridges on this board, are there any particular ones you recommend trying first? For example, the closest one to the AC connector is PJP200, so would it be the best one to try? There's also a few PJP solder bridges that don't have any solder on them, so should these be ignored?
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Re: Laptop's AC adapter turns off when connected, corrosion on power-related componen
Ah, I thought that might have been why. That's a shame, I thought it might have been indicating the short had been removed!
OK, I've purchased a flat-sided soldering iron tip to see if I could cleanly remove the solder from the solder bridges. Well, I feel really dumb for having had so much trouble using solder wick in the past, because the flat-sided tip removed it all in seconds! This whole time I wasn't using the correct tip!
Anyway thanks to this new tip, it seems...
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