mist79
New Explorer
Last Activity: 05-13-2024, 06:58 AM
Joined: 04-22-2024
Location: Essen
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Thanks for all the help and guidance, I really appreciate your effort! -
Let me be honest with you man, I couldn't lift up the positive cap (lower cap pointing toward the battery) following this video from 1:17 to 1:47 didn't work at all (I do only have lead free solder) and I didn't want to burn the board
[url]https://www.youtube.com/watch?v=Eg8WZZAjilI[/url]
with a heat gun and flux I heated the positive side of the capacitor for around a minute and couldn't lift it up, and it got really hot so I stopped. What do you recommend? I am so inexperienced that I have no idea when to stop and when to keep goingLet me be honest with you man, I couldn'tLeave a comment:
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Before I remove PL601 can you explain to me what you mean by that? test the resistance how? of PL601 to Ground?
And nothing seems burnt out to me near PL601 from both sides of the board....Leave a comment:
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I just did, it starts at 0.7Ω and goes down to 0.3-0.2Ω every time. Do you think replacing this capacitor will fix the problem we have with the main power rail?Leave a comment:
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Resistance to Ground for all the capacitors in the motherboard (this took a while):
PL101=44.1kΩ
PL102=44.1kΩ
PL103=44.1kΩ
PL104=61.2kΩ
PL105=61.2kΩ
PL201=2.3MΩ (pin1)
PL601= ~0.7Ω (can't get a clear reading)
PL602=16.3 kΩ
PL901= 32.1Ω
PL1401=160Ω
PL3001= 1.4Ω
PL3002= 1.4Ω
PL3003= 1.4Ω
PL3004= 1.4Ω
PL3102= removed, but 2.5Ω from one pin
PL3201= 10.3Ω
PL7301= 0.3Ω
PL7302= 0.3Ω
PL7401= 28.3kΩ (pin2)
PL7402= 12.7Ω
PL7501= 0.3Ω
...Leave a comment:
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Can you clarify what you said there? what do you mean by checking every inductor in the main power rail, can you specify which ones? (parts number from the schematic [password: Y540] so I can check it). and what do you mean by "for the same resistance to ground" what value are we looking for?...
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So does this mean I have a faulty CPU now?...Leave a comment:
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I really appreciate you explaining what happening to me, and why we are doing what we are doing; I need that since I am just a beginner. So I am not sure if this is what you mean, but here is the measurements for the group of inductors that are close to the CPU (The boardview that is provided is not the exact same as the model I have, but close enough). Resistance to Ground, on the lowest scale, for:
PL3001 = 1.3
PL3002 = 1.2
PL 3003 & PL3004= 1.3
PL3021= 10.5
PL901 = 32.4
If these are not the components that I need to measure, plz...Leave a comment:
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I am still new to this,I don't have an adjustable power supply or a thermal camera.(I do have a soldering station with a heat gun tho)
What else can I do to identify this short otherwise?Leave a comment:
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For PQ201 resistance Between:
Source (Red Probe) & Drain (Black Probe)= 2.02
Source (Red Probe) & Gate (Black Probe) = 3.62
Gate (Black Probe) & Drain (Red Probe) = 5.41
For PQ202 resistance Between:
Source (Red Probe) & Drain (Black Probe)= 2.06
Source (Red Probe) & Gate (Black Probe) = 3.63
Gate (Black Probe) & Drain (Red Probe) = 5.33
First CLR (Current Load Resistor) after the 2 DC-IN mosfets is PR201, and it resistance to Ground = 0.01...Leave a comment:
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I re-measured the voltage to ground of PQ201 GATE (pin4) and it's 0V. And the voltage to ground of PQ201 Source (pin1) is also 0VLeave a comment:
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Lenovo Legion Y540-15IRH, PQ201?
I am still new to this, so I might sound brainless/ignorant in parts of my description/questions, since I have a lot of gaps in my knowledge, but I will do my best.
The laptop is Lenovo Legion Y540-15IRH, and the motherboard model is NM-C221 Rev 2.0 (Schematics and BoardView can be easily found). To save time I have the exact problem in the laptop as the one shown in this video:
[url]https://www.youtube.com/watch?v=tfucZ_WKpz4[/url]
I was checking the voltages I found that the main power rail V20B+ is good, and same for the +3VALW circut, but when I tried the +5VALW,... -
Hello, I'm from Morocco but I live in Germany and I'm interested in electronics, I would love to be part of this community. Knowing that I am new to all this, I will try my best to help if I can.Leave a comment:
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