Wow..seems something new to the community... i see that 2 other time on other laptops, replaced mosfets, replaced capacitors... but still the spike, is something related to the driver? any idea?
i can post more images about the signal before the inductor and also gates of the mosfets...
if this can help.. the Vcore is starting at 1 volt and after a while descending to 0.7/0.8 like usual on these kind of CPUs... the accurate variation of the voltage seems confirm that the drivers is working correctly... but from where come from the small spike? a small timing issue on high side mosfet gate control?
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Lenovo S145 -15iwl vcore inductor warm.. looking with oscilloscope there is a spike.
Hi, i have a Lenovo S145 that after 20 seconds shutdown and restart (it's working correctly on thse 20 seconds)
everything seems ok, but on Vcore inductor ( this is an i3 with just 1 switching power supply for CPU)
there is an output to teh CPU with a spike.. seems that inductor can't handle the input...
replaced the capacitor (330) and the inductor (R15) without any change
any idea? very thank you!
input of the inductor seems as usual... only strange thing is that the upper/lower voltages seems to be 21V (main power line is 19.3) ... but not sure this can be a reading issue of the oscilloscope.
Attached Files -
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Looks like I may need a little help from the PSU experts (or anyone really!
) I have a Corsair CX750M (Model 75-002019) that I picked up for free about 4 years ago. This is the PSU:
So here’s what’s strange about this one: it appears to work normally (normal output voltages) and any PC is stable with it. However, after a while (typically 10-20 minutes, but time can vary depending on the load), there is a sweetish smell of burned magnet wire insulation emanating from the PSU. Upon opening the PSU after this happened (many times), I was able to confirm... -
Hi
I am facing an issue of PXS_RST# Missing Signal From SOC To Graphics Card which causes No display ,No Shorting on Graphics and no shorting on anywhere, All PowerGood ok ,Dramreset ok,LPC Ok,PLTRST ok,Also Disabled Onboard Ram still same ,With External Ram Same issue
Checked PXS_RST# No shorting to ground
Bios done Many times but not resolved
Here is Motherboard Details
Lenovo Ideapad S145 15IWL 81MV
LCFC NM C121 Rev 1.0
Discrete Graphics N16 with 2GB DDR5
Onboard Ram 4GB
Anyone Know this then pls help to resolve -
Hello.
First, I would like to extend my wishes for a Happy New Year to everyone.
... so I got this notebook for repair. The ntb is not turning on. A small amount of water was spilled on the keyboard and I found only 2 dried spots, patches on the motherboard. One around Mosfet PQ5302 but is not damaged and the second on JEDP1 connector.
I measured:
Mosfets:
PQ5301 PIN:4 25,35V
PQ5908 PIN:5 GT_PH shorted to the ground
PQ5902 PINs 1-4 shorted to the ground
Coils:
PL5901 shorted to the ground
PL5902 shorted... -
Lenovo IdeaPad S145-15IWL 81MV need bios repair,When I connect the charger from the laptop and try to turn on the laptop, nothing happens, I take out the CMOS battery, wait a few seconds and turn on the CMOS battery again, I connect the power supply to the laptop, it turns on by itself, the logo appears, the post flashes, the LED on the laptop's ,power button does not allow me to F2 to access the bios settings, I can turn off the laptop only if I pull out the charger connector from the laptop, turn it on again and the laptop does not respond to the power button, it turns on only if I turn off... -
lenovo ideeapad s145-15iwl
pn: 5B20S41743
8S5B20S41743L1HF968C1BD
QR
1304491302229
4511901220X
FS540 10E2
bios fix for this model?
thanks...
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