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Old 04-13-2017, 08:17 PM   #1
spintop
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Default Lenovo Yoga 2 Pro schematic and boardview

Need the schematic of the laptop.
Got a dead laptop.
Thank you in advance
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Old 04-15-2017, 11:22 AM   #2
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

Hi, some information please ? sympthoms etc.
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Old 04-16-2017, 08:20 AM   #3
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

Quote:
Originally Posted by tomodachi View Post
Hi, some information please ? sympthoms etc.
Cannot on, blank screen, keyboard backlight flash every few second.
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Old 04-18-2017, 01:53 AM   #4
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

anyone can help ?
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Old 04-20-2017, 11:02 AM   #5
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

Have you dissembled it yet? What are the etchings on the board to better identify and search for it...
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Old 04-20-2017, 05:53 PM   #6
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

yes dissembled. main board is small with cpu n ram embedded.
part number VIUU3 NM-A074 rev1.0
ebay is selling but expensive.

anyone got it, thanks
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Old 06-21-2017, 07:25 AM   #7
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

Hi, I got the same laptop, and it doesn't start...Have you repaired yours?
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Old 06-21-2017, 07:20 PM   #8
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

I have not repaired it yet.
No idea what is wrong.
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Old 11-28-2017, 09:54 PM   #9
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

Try this..
Attached Files
File Type: rar NM-A074 Yoga 2.rar (3.14 MB, 1284 views)
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Old 12-03-2017, 01:36 AM   #10
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

Lenovo Yoga 2 Pro schematic
Attached Files
File Type: pdf Lenovo YOGA2 PRO LCFC NM-A074 VIUU3 rev 1.0.pdf (925.3 KB, 1257 views)
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Old 12-08-2017, 06:45 PM   #11
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

580s thanks for the file. its a great help looking into the motherboard.

wonder if u also have the boardview file
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Old 12-08-2017, 07:59 PM   #12
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

Quote:
Originally Posted by spintop View Post
wonder if u also have the boardview file
I think right now not available, Hard to find boardview for LCFC-NM family.
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Old 12-16-2017, 10:07 PM   #13
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

With ac adaptor n battery connected, I am only getting 8v at Vin (see diagram
Page 29). I m expecting 19v here. This is not normal isn't it ?

Btw I have already change the IC pu10.
Dcin at Pin 2 = 19v
Adet pin 3 = 3.5v
Acok pin 14 = 3.3v
Vdd pin 19 = 5.1v
Above voltage looks normal. Ie without switching on the laptop yet.
I also have 3.3v available. So pu6 is working.
But no 5v from pu5. Meaning system is not turn on yet.
At v_chg is 19v.
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Old 12-22-2017, 03:52 AM   #14
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

what is the voltage on pin 4 of pq4 and pq33?
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Old 12-22-2017, 07:25 AM   #15
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

at PQ4 -- pin4 =1.8v pin1=20.2v pin5=20.2
at PQ33 -- pin4 = 19.7v pin1=19.7v pin5=20.2
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Old 12-23-2017, 01:25 AM   #16
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

can Vin be just 8.5V when ac adaptor and batt is present ?
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Old 12-23-2017, 04:21 AM   #17
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

Quote:
Originally Posted by spintop View Post
at PQ4 -- pin4 =1.8v pin1=20.2v pin5=20.2
at PQ33 -- pin4 = 19.7v pin1=19.7v pin5=20.2
Make all measurements without battery. Remove pq33 and check it.
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Old 12-27-2017, 06:28 AM   #18
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

with PQ33 removed, no batt. getting below readings

at PQ4 -- pin4 =1.8v; pin1=20.2v; pin5=20.2
at PQ33 -- pin4 = 1.2v pin1=1.1v; pin5=20.2

at pu10, pin26 (sgate) =1.3v
i checked pq33 (p-channel), in diode mode drain-source is 0.545
pq33 seems normal.
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Old 09-08-2018, 10:47 AM   #19
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

I am not able to fix the laptop. I have already sold it away. Are u getting Vin abt 8.5v ? My initial thought was 19v, but I think 8.5v should be normal for this laptop. Then the power ic is fine.
I saw someone online heating up the CPU area, and it solved the blinking keyboard issue. So it could jus be some weak solder joints.
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Old 09-10-2018, 12:28 AM   #20
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Default Re: Lenovo Yoga 2 Pro schematic and boardview

hmm, sorry to hear that, yes i have 8,5 V Vin, mosfets looks okay, i tried reflowing cpu, but nothing, only that one chip is heating like hell. I accidentaly touch some resistors near it and one fan turned on
im wondering, can i swap cpu to normal yoga 2 13? i know its soldered on i have usable equipment, in my yoga 2 13 is i5 4210u 3MB cache and only 4gb ram :/
or LCD screen ? it have different cables, but eDP should be same on lcd pannel, swap 4k to yoga 2 with 1080p sreen
i will wait for IC from ebay, Now i am only looking for what can be done.

Last edited by flankerzo; 09-10-2018 at 01:47 AM..
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