• Lenovo Ideapad 320 no display

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Lenovo Ideapad 320 no display

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  1. Topic title should contain: the device's manufacturer, full model and the brief description of problem.
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#1 Lenovo Ideapad 320 no display

by cygron • 21 May 2025, 05:55
Model : Lenovo Ideapad 320
Board id : DG425 DG525 DG725 NM-B321 Rev 1.0 2017-03-14

Laptop came with blown mosfet PQ2203. I replace with good mosfet. Now laptop is on but no display. There is no voltages on PL2201 and PL2202. EC_VR_ON has 3.3V. All other coils have proper voltages. Resistance between PQ2203 mosfet pin 1 and pin 4 has 5.5 Ohm. Is layer problem?

Image

Re: Lenovo Ideapad 320 no display

by Google Adsense [BOT] • 21 May 2025, 05:55

#2 Re: Lenovo Ideapad 320 no display

by tekort • 21 May 2025, 17:01
It is not layer problem, if the PQ2203 was damaged/burned, it means that rail +19V was shorted with line APU_CORE_VIN which means that CPU received 19V directly. You would need to replace the APU.

#3 Re: Lenovo Ideapad 320 no display

by matic • 22 May 2025, 13:02
cygron wrote:Resistance between PQ2203 mosfet pin 1 and pin 4 has 5.5 Ohm. Is layer problem?
Possible, otherwise the driver chip PU2201 is damaged.
Remove the chip PU2201 from the board and remeasure the resistance.

#4 Re: Lenovo Ideapad 320 no display

by cygron • 22 May 2025, 16:24
Yes. you're right. PU2201 is damage. Replace PU2201 and resistance is fine. When opening laptop, PL2201 and PL2202 has about 0.9V. But no display (picture).

#6 Re: Lenovo Ideapad 320 no display

by matic • 22 May 2025, 20:36
Measure the power consumption (in mA) of the board, when the machine is turned on with and without RAM memory connected.

Re: Lenovo Ideapad 320 no display

by Google Adsense [BOT] • 22 May 2025, 20:36
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