• Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Danes je 17 Julij 2025, 00:13

 [REŠENO] Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

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#21 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a sebuncle • 3 November 2018, 15:44
Hi
here's voltage

PL 201 = 0v
PL 202 = 0v

PU 201
pin 1 = 0v
pin 5 = 0,8v
pin 8 = 9,02v

PU 202
pin 1 = 0V
pin 7 = 5,2v
pin 8 = 9,02v

PL201 is hot.

Best regards

Re: Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a Google Adsense [BOT] • 3 November 2018, 15:44

#22 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a matic • 3 November 2018, 15:53
Measure the resistances to ground on coils PL201, PL202.
Measure the resistance to ground on pin 5 of PU201.

#23 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a sebuncle • 3 November 2018, 17:39
PL201 = start to 388KΩ and drop to 37KΩ and stay stable
PL202 = 15Ω

resistance on pin 5 PU201 is 1,9KΩ

Best regards

#24 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a matic • 3 November 2018, 17:55
Are you sure that the coil PL201 is hot and not the chip PU201 or PU202?
Repeat the resistance measurement on coil PL202.

Remove the jumper PJ204 and after that measure the voltage to ground on pin 5 of PU201.

#25 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a sebuncle • 4 November 2018, 00:47
Yes sorry ,
you're right PU201 is hot

If i remove JP4 there's 3,3v on pin 5 and PU201 is not hot.

Best regards

#26 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a matic • 4 November 2018, 12:43
Measure the resistance to ground on highlighted resistor.

Slika

#27 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a sebuncle • 4 November 2018, 12:52
matic napisal/-a:Measure the resistance to ground on highlighted resistor.

Slika

Hi,
there is 1,9KΩ without plug
and there is 0,83MΩ with plug

Best regards

#28 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a matic • 4 November 2018, 13:07
Solder the jumper PJ204 back to the place and measure the resistance to ground on this jumper.
Measure the resistance to ground on coil PL201.

#29 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a sebuncle • 4 November 2018, 14:42
sebuncle napisal/-a:
matic napisal/-a:Measure the resistance to ground on highlighted resistor.

Slika

Hi,
there is 1,9KΩ without plug
and there is 0,83MΩ with plug

Best regards

I measure with PJ204 in place , you wan't i take without ?

resistance on PL201 is 37KΩ

Best regards

#30 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a matic • 4 November 2018, 14:47
Just solder the jumper PJ204 back to its place, after that measure the resistance to ground on this jumper.

#31 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a sebuncle • 4 November 2018, 15:50
ok these value are with PJ204 solder
there is 1,9KΩ without plug
and there is 0,83MΩ with plug
PL 201 = 37KΩ with ground

best regards

#32 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a matic • 4 November 2018, 16:47
In case of measuring resistances all power sources should be disconnected, no matter which resistance you measure!

Remove the resistor highlighted on the picture in post #26. Is the chip PU201 still hot in this case? Also measure the voltage to ground on jumper PJ204 in this case.

#33 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a sebuncle • 4 November 2018, 17:08
matic napisal/-a:In case of measuring resistances all power sources should be disconnected, no matter which resistance you measure!
Ok I would be careful

So if i remove resitance , PU201 stay hot. In this case there is 0,8v on PJ204

Best regards

#34 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a matic • 4 November 2018, 17:36
Perform a short circuit test on jumper PJ204. Voltage should be limited to 3.3V. Short circuit test is described here.
Check, which component gets warm (if any). Pay special attention to the KBC and APU chips.

#35 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a sebuncle • 4 November 2018, 18:16
matic napisal/-a:Perform a short circuit test on jumper PJ204. Voltage should be limited to 3.3V. Short circuit test is described here.
Check, which component gets warm (if any). Pay special attention to the KBC and APU chips.

I solder résistance ?

Best regards

#36 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a matic • 4 November 2018, 18:17
sebuncle napisal/-a:I solder résistance ?
Keep it removed.

#37 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a sebuncle • 6 November 2018, 21:04
Hi
i make the test and i found DC37 or DC1 hot
So i replaced them but nothing change

Best regards

#38 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a matic • 6 November 2018, 21:45
Measure the resistance to ground on cathode (- pin) of diode DC37.

#39 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a sebuncle • 7 November 2018, 20:06
matic napisal/-a:Measure the resistance to ground on cathode (- pin) of diode DC37.

Hi
resistance on DC37 is 2Ω
Best regards

#40 Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a matic • 7 November 2018, 20:54
sebuncle napisal/-a:resistance on DC37 is 2Ω
This is a short circuit to ground. Perform a short circuit test. Limit the voltage to 3.3V.
Unfortunately there is a likely failure of the PCH part of the APU chip.

Re: Lenovo yoga 3 14 /80JH/BTUU1 NM-A381/ doesn't start

Napisal/-a Google Adsense [BOT] • 7 November 2018, 20:54
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