mon2[USER="295753"]mon2[/USER] with the pl402 removed from the board, i have the following:
- without power cable connected to the board: on one side of the PL402 - 1,5KOHM and 2,6MOHM on the other side, i cannot tell from the board which side is the producer rail or the consumer
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mon2[USER="295753"]mon2[/USER]
PL1201 - 115 KOHM
PL702 - 3,6 OHM
PL302 - 35 KOHM
PL402 - 42 OHM
PL404 - 79 KOHM
PL502 - 168,6 OHM
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Y50-70 turns on, no video, fans dont spin
Hello,
My Lenovo Y50-70 turns on but i have no video, fans dont spin, keyboard lights turns on, no ssd activity.
I removed battery, hdd, rams, bios battery, then pressed power button for 30 sec to drain out all energy, still same thing, i did check both mosfets on power module of the board, pq301 and pq302, i get 20,5V on all pins except one pin that have 8.7V
Connected external keyboard, tried on all 3 usb ports, no leds on the keyboard, neither numlock, checked voltage on usb pins, i only have 5.1V on 1 pin, rest 0V
I have 1.4v on PL502 with...
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Schematics [url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/1137230-lenovo-y50-70-la-b111p[/url]https://Schematics [url]https://www....la-b111p[/url]
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Connected external keyboard, tried on all 3 usb ports, no leds on the keyboard, neither numlock, checked voltage on usb pins, i only have 5.1V on 1 pin, rest 0V
I have 1.4v on PL502 with power on, addpter is connected and working properly, got 20.5V on both channels.
U11 have 3.3v on pin 5 when power is on
U23 have 3.3v on both 8,9 pins
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I found out that all these smd capacitors are short, check image:
Also on PQ501 pin 1 2 3 4 are short, pin 4 should not be short with 1 2 31 Photo
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With power off on U11 i have:
Pin1 - 0V
Pin2 - 0V
Pin3 - 0.06V
Pin4 - 0V
Pin5 - 0V
With power on on U11 i have:
Pin1 - 0V
Pin2 - 0V
Pin3 - 0V
Pin4 - 3.35V
Pin5 - 0V
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With power button pressed (battery disconnected, only connected to power adapter):
PL302 - 2.5V
PL402 - 3.3V
PL404 - 5.1V
PL502 - 1.4V
PL702 - 1.1V
PL1201 - 5.1V
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Withour power button pressed (battery disconnected, only connected to power adapter):
PL302 - 2.6V
PL402 - 3.3V
PL404 - 5.1V
PL502 - 0V
PL702 - 0V
PL1201 - 0V...
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Hello,
Board model is ZIVY2 LA-B111P
REV: 1A
I will check voltage on the coils you specified!
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Y50-70 turns on, no video, fans dont spin
Hello,
My Lenovo Y50-70 turns on but i have no video, fans dont spin, keyboard lights turns on, no ssd activity.
I removed battery, hdd, rams, bios battery, then pressed power button for 30 sec to drain out all energy, still same thing, i did check both mosfets on power module of the board, pq301 and pq302, i get 20,5V on all pins except one pin that have 8.7V
Any ideas what to check more?
Thank You
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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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