Re: Lenovo Y50-70 PQ301 overheating
Problem was PQ312, it was on short between D-S, i replaced the mosfer and laptop works perfect now!
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Re: Lenovo Y50-70 not working on power adapter, only on battery
I forgot to mention i have PR302 removed from board to protect B+ line
Can you please help me locate PR311 on board, let me know if it is this one on the image thanks!
[url=https://ibb.co/tZFKNkb][/url]Re: Lenovo Y50-70 not working on power adapter, only on battery
I forgot to mention i have PR302 removed from board to protect B+ line
Can you please help me locate PR311 on board, let me know if it is this one on the image thanks!
[url=https://ibb.coLast edited by costivl; 05-04-2020, 11:57 AM.
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Re: Lenovo Y50-70 not working on power adapter, only on battery
Board schematics:
[url]https://www.laboneinside.com/lenovo-ideapad-y50-70-schematic-diagram/[/url]
Check page 47 for PQ301 and PQ302
I also checked PQ301 and PQ302 gate pins and i have 20V on both, it shouldnt be 5v or so?
Let me know thanks!Re: Lenovo Y50-70 not working on pow...e 47 for PQ301
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Lenovo Y50-70 not working on power adapter, only on battery
Hello,
This laptop is not powering up with power adapter connected, it only works when battery connected, also it does not recharge battery, i did some checks and i have the following with battery disconnected:
P2 - 20V
VIN - 20,5V
P3 - 0,6V
i replaced PQ302 and i get the same voltages so PQ302 is not the fault in here.
if i connect the battery i get 7V on P3 but battery not recharging.
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Equivalent for BQ24737RGRR VQFN20
Morning, i need equivalent for BQ24737RGRR VQFN20 IC from a Lenovo Y50-70
Thanks
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Re: Lenovo Y50-70 PQ301 overheating
I have no resistence between G-S and G-D on PQ303
I just found out that PU301 is damaged, there is a little hole on it so i need to replace it, can you tell me what can be the cause of this, what i should check on the board? There must be a short on something if PU301 got damaged.Last edited by costivl; 04-25-2020, 10:18 AM.
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Re: Lenovo Y50-70 PQ301 overheating
I needed to replace the battery on my multimeter as it was discharged. And i did the measurements again, here are the results?
I get 20,5V on adapter without being connected.
With PR302 removed from motherboard i read 20V on P2 and 20V on P3 also 20,5V on VIN, PF101 voltage on both pins is 20,5VLast edited by costivl; 04-20-2020, 03:54 AM.
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Re: Lenovo Y50-70 PQ301 overheating
PQ302: voltage on P3 (pin 5-8) is 0.78V, the voltage on pin 4 is 9.80V and the pins 1,2,3 shows 1, PQ302 is removed from board!
PQ301: voltage on pin 4 of is 9.80V all other pins shows 1, PQ301 is not removed from board.Last edited by costivl; 04-17-2020, 02:26 AM.
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Re: Lenovo Y50-70 PQ301 overheating
I removed PR302 and now PQ301 it is cold, what to check next? Or PQ302 is the cause?
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Lenovo Y50-70 PQ301 overheating
Hello,
First of all please excuse my bad english as it is not my native language.
Two days ago when i was working on my laptop i felt that the left side of the keyboard is very hot and after 1-2 minutes i felt a smell of burnt plastic, i turned off the laptop, then i opened it inside and i found out that the power jack that connects to the motherboard was melting, i ordered the cord and replaced it, i was trying to find out the cause for that overheating and i just learned that the mosfet PQ301 is causing the overheating. Just to mention my laptop works perfect on battery...Last edited by costivl; 04-14-2020, 10:53 AM.
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