Re: Acer Aspire E5-574G - Not Powering On
Thanks, and I agree with you. There is no point as the CPU is soldered to the motherboard. It will take a lot of skill and precision to de-solder and then solder a new CPU.
Thank you very much mcplslg123 for your help. I learned a lot from you and piernov's guide as well. I didn't have much knowledge or experience but you were always very kind, and patient. Always responded as well. Much appreciated. Next time if anything like this happens it will be resistance mode all the way, and probably not use 19V AC adapter to burn...
novice1
Member
Last Activity: 11-11-2023, 05:59 PM
Joined: 09-28-2023
Location: NY
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Re: Acer Aspire E5-574G - Not Powering On
Thanks for the confirmation. I started by injecting 1V/5A but nothing was getting hot at all. So I increased the current to 8A, the only component that got hot was the CPU, and then later after sometime the other side of the board area below it. But the side where the CPU is the hottest. To know what side is warming up faster, I placed fingers on both the CPU side and the other side of the board right below it at the same time. I believe the CPU side gets hot first, and then the other side of the board area right below it starts to get warm....Last edited by novice1; 11-10-2023, 06:45 PM.Leave a comment:
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Re: Acer Aspire E5-574G - Not Powering On
De-soldered PL15 per your suggestion. I did not de-solder PR213.
Below are readings for resistance to GND on both the pads of PL15. With the multi meter in resistance mode, and black probe to the ground, and touching the red probe one by one to the pads of de-soldered PL15.
1) Pad 1 (51216_SW), Resistance = ~2 Mega Ohms (fluctuates in several Mega Ohms)
2) Pad 2 (+1.35VSUS), Resistance = ~0.4 ohms
Multi meter in continuity mode only beeps on Pad 2 of PL15, and does not beep on Pad 1.
...Last edited by novice1; 11-09-2023, 06:33 PM.Leave a comment:
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Re: Acer Aspire E5-574G - Not Powering On
Below are readings for resistance to GND on PL15. No power was connected. With the multimeter in resistance mode, and black probe to the ground, and touching the red probe one by one to the pins of PL15.
With RAM stick, resistance = ~0.4 Ohms
Without RAM stick, resistance = ~0.4 Ohms
Same in both cases and less than 1 ohms.
I haven't de-soldered anything yet. Power supply should be here by tomorrow. Shouldn't I wait and do voltage injection by only removing PR213. I mean go with the original plan....Last edited by novice1; 11-08-2023, 09:59 AM.Leave a comment:
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Re: Acer Aspire E5-574G - Not Powering On
Thanks for the explanation above. As I wait for the power supply, investigated this further and have a few more questions. Might have found something interesting so wanted to share as it could narrow down this problem even further. In this new test, checked all the [B]inductors[/B] on the board to see if any inductor is lower than 1 Ohms. This is again based on Piernov's guide point 2.1.2 (Short to ground on main power rail). If I used the wrong terminology or performed the wrong tests below, please correct me.
I did so with...Leave a comment:
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Re: Acer Aspire E5-574G - Not Powering On
Thanks again. This is very helpful and I will do the above test but currently I don't have a variable DC power supply. I plan to order one today and should get it by Thursday or Friday. I have a few questions just for my understanding so as to learn.
1) For PR213, you chose Pin 2(VIN) and not Pin 1(VA2) to inject voltage because some components with VIN on one pin have the other Pin connected to GND while this is not the case for VA2. For example component PC141 has Pin1 as VIN and Pin2 as GND. But with all components with...Leave a comment:
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Re: Acer Aspire E5-574G - Not Powering On
Thank you both for answering. Sephir0th I did not pull out PR166 yet because I agree with you that probably some other component is bad and probably there is short to ground on the main rail. I want to test more before I jump the gun.
So based on mcplslg123 advice I performed below tests on PR213, and some other components connected to the main power rail. I also attached a pic of PR213 for confirmation.
All of the below tests measure resistance to the ground on the main power rail. To be precise I did so with the...Last edited by novice1; 11-05-2023, 12:23 PM.Leave a comment:
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Re: Acer Aspire E5-574G - Not Powering On
That is very true. I'm definitely not knowledgeable and missing experience. That’s why I came here, and am willing to learn and give it a shot. One of the reasons I bought the practice board, and spent time learning the schematic.
I understand your point and used the wrong technical terminology. Thanks for the correction. It might not be called a shorted main power rail but I'm positive that resistor PR166 is showing a wrong value. I wore much bigger lens and re-tested everything again before posting this comment. I can...Last edited by novice1; 11-04-2023, 08:00 PM.Leave a comment:
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Re: Acer Aspire E5-574G - Not Powering On
After reading the Piernov's guide a hundredth time today, found a fault in one of my previous readings and would like to correct it. Re-did all my tests again. I think I have found a faulty resistor. In my comment 1, I said the following:
"1) (CMSRC) PR166: Resistance = ~4K. Resistance value is correct. Voltage on Pin 1 = ~0V, Pin 2 = ~0V. Both voltages are incorrect and should be 19V."
This statement is not true. PR166 and PR165 are so close to one another that I got the PR 166 reading wrong. My apologies...Leave a comment:
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Re: Acer Aspire E5-574G - Not Powering On
Piernov after reading your guide further and delving into more technical details. Hopefully I understood stuff correctly. I'm posting the following resistances between ground and Pins 1 and 2 of charging IC PU5 (BQ24780S)
1) Resistance = ~0.51 ohms, Between ground and Pin 1 (ACN)
2) Resistance = ~0.51 ohms, Between ground and Pin 2 (ACP)
I measured the above by touching my black probe to the ground and my red
probe to Pin 1 and then Pin 2 of charging IC PU5.
As I mentioned in the...Leave a comment:
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Re: Acer Aspire E5-574G - Not Powering On
Thank you both for the response. My apologies for posting the schematic and board view in the wrong place. I didn't fully understand the answers, and to avoid any confusions I have a few questions before proceeding as I'm new to this and don't want to damage the board.
1) You said "ACOK must be +3V PR1/4 100K replace the resistors visually damaged". But PR1/4 both [B]don't[/B] look visually damaged at all.
I can confirm that I have a spare practice board from Acer E5-575 that I bought on ebay. PR1/4...Last edited by novice1; 11-04-2023, 09:49 AM.Leave a comment:
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Acer v3-575g-79xk da0zrwmb6g0 rev:g request boardview
Schematic + Boardview...Last edited by SMDFlea; 11-04-2023, 03:46 AM.Leave a comment:
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Acer Aspire E5-574G - Not Powering On
Laptop name Acer Aspire E5-574G. Processor = i7-6500u. GPU = NVIDIA GEFORCE 940M. Motherboard Model = DA0ZRWMB6G0
This laptop was not powering on at all so I started investigating. The blue light would come on for a second, and then disappear. Fan would sometimes turn on for a second and then shut off immediately, and at other times would not turn on at all.
To start with, about 3 months ago I had no clue about soldering, motherboard schematics, board view, and then I stumbled about this forum and other stuff online. I have never done any of those before. But to ask...Last edited by SMDFlea; 11-04-2023, 03:52 AM. -
Re: New Members - please post your introductions here
Hi. I'm a beginner with no experience in finding shorts and soldering. I work on the software side and have done minor things like installing ram, cpu, ssd, and wifi cards.
In the past month I have read a lot of threads here about motherboards (schematics, boardview, ACDRV, REGN and so on) and soldering on this forum. Can't thank enough for helping me learn so much. Decided to make an account since I've a dead laptop motherboard that I'm trying to fix.
Before I made this account, and based on the...Leave a comment:
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