Re: No power Lenovo Yoga 920-13ikb (DYG60 NM B291 Rev 1)

Ok the pins are tiny on this one so to be sure I had contact, measurements were done off PR53, pin 22 and 21 on PU9. All measurements for PQ12 are OL.

Re: No power Lenovo Yoga 920-13ikb (DYG60 NM B291 Rev 1)

That link is useful thanks.

PQ8 S-D OL S-G 192 G-D OL
PQ9 S-D OL S-G 180 G-D OL
PQ10 S-D OL S-G 193 G-D OL
PQ11 S-D OL S-G 181 G-D OL

Re: No power Lenovo Yoga 920-13ikb (DYG60 NM B291 Rev 1)

Here is the diagram

[url]https://www.badcaps.net/forum/showthread.php?t=76237[/url]

.Re: No power Lenovo Yoga 920-13ikb (... /> <br /> .Re: No power Lenovo Yoga 920-13ikb (DYG60 NM B291 Rev 1)

Here is the diagram

[url]https://www.badcaps.net/forum/showthread.php?t=76237[/url]

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Re: No power Lenovo Yoga 920-13ikb (DYG60 NM B291 Rev 1)

I'm not entirely sure how to test the mosfets but PQ8 with my multimeter in diode mode reads about 0.49 volts in one direction, then transiently 2.5 volts in the other direction, then OL. All the others seem to read around 0.49 one way but stay around 2.5-2.6 the other way. I was expecting OL the other way for all, this behaviour persists despite shorting the gate to the source pins.

Re: No power Lenovo Yoga 920-13ikb (DYG60 NM B291 Rev 1)

Ok so impedance at the inductor revealed PL7 = 25, PL13 =12.9, PL14 = 6.9 and PL15 6.8. PL8 and PL6 transiently read 20-170 then no conduction to ground. Not sure if that helps. Thanks for your assistance.

Re: No power Lenovo Yoga 920-13ikb (DYG60 NM B291 Rev 1)

I'm new at this. But is VIN the main power rail to the board? What kind of voltage should I expect on PQ9? Looks like PQ12 goes to the battery?...

Hello, I have a Lenovo Yoga 920-13ikb (DYG60 NM B291 Rev 1) which will no longer power on. Charge light does not come on when I plug in the adapter. I have the schematics but could use a little guidance as to which measurements to take to troubleshoot the board. With the battery and USB-c power connected, I get 20v at PQ8, 6.18v at PQ10. Let me know if you require further info to assist me. Also if it makes a difference, approximately a week before the inability to power on, my keyboard and trackpad was going unresponsive. Disconnecting then reconnecting the battery appeared to have resolved that...

Re: New Members - please post your introductions here

Hey everyone. Freddi from Canada. This forum is a gold mine. Look foreword to repairing my failing devices.