Lenoovo yoga 3 14 not power on

[asem18]

Hello folks. Lenovo yoga 3 14 not power on.
Coming from another repair shop..find Q23 burning and change it .
No amp taken when i push button , PQ101 = 0.500v and decreasing.
Try to find ADIN_1 , from charger connecter to
PQ107 ( P-channel ) = Drain 19.01v
gate = 18.30
S = 18.65v.

PQ106 ( P-channel ) = S= 19.65v
Gate = 18.50V
Drain = 0V ( ADIN_1 )

What to sheck else please..thank you.

Link to schematic - https://www.badcaps.net/forum/troubl...a381-schematic

[mcplslg123]

Re: Lenoovo yoga 3 14 not power on

PR119 & PR128 forms the voltage divider for PQ106 gate. Voltage divider is obviously not working-so you need to check what's wrong. Remember a voltage divider circuit will work only and only if:
01.There is more then one resistor involved in the circuit
02.VCC is present on one end and ground reaches the other end of circuit.

Measure charging ic pins and report back.

[asem18]

Re: Lenoovo yoga 3 14 not power on

Thank you mcplslg...yes for the divider , and will must find = 10 Volt...but for Pr119 = 18.65v on each side...for Pr 128 =17.50v and decreasing from the two side.

For charging ic ,since we don't have vcc on it = pin 20...i have nothing !...pin 4/5/6/20 = 0v

[tesnic]

I have exactly the same problem. Same voltage values on pq106 and pq107. ADIN-0 without voltage... How do you resolve it? Thanks ans sorry to reflote it...