Lenovo V110-15IAP It won't turn on, it won't charge

[Jokerx84]

Hi!
Lenovo V110-15IAP (LV114A_MB 15270-1) It doesn't turn on, it doesn't charge, only the charging LED flashes orange!

Does anyone know what the problem could be?

[Stevedb]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

No we do not have a glass bol to see. Take hd pictures off the bord front and back , and do measurements from all grey coils and the current sensor, voltage and resistor mode at 200 ohms without power , cmos battery , wifi card , mrmory etc...

[lapfix]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

Try with another charger, try without battery connected ...than do what stevedb ask for

[Jokerx84]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

No we do not have a glass bol to see. Take hd pictures off the bord front and back , and do measurements from all grey coils and the current sensor, voltage and resistor mode at 200 ohms without power , cmos battery , wifi card , mrmory etc...

I measured this

[mon2]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

You have 2 x DC-in mosfets on this logic board.

Using the resistance mode, check the mosfet condition of each.

Remove all power / no battery.

Meter in resistance mode.

Check the resistance across the mosfet pins to check if it is defective.

Source (1-2-3) & Drain (5-6-7-8)
Source (1-2-3) & Gate (4)
Gate (4) & Drain (5-6-7-8)

Post the above readings (and the meter scale) for PU4401 and then again for the next mosfet PU4402 that follows. A low reading = defective mosfet.


reference reading (see the resistance table):
http://electronicsbeliever.com/how-t...0good%20MOSFET.

[mcplslg123]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

Voltage on S-D-G pins of first 2 dc-in mosfets also.

[Jokerx84]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

voltage on s-d-g pins of first 2 dc-in mosfets also.

pu4401
s=20.1v
g=6.7v
d=20.1v

pu4402
s=20.1v
g=20.1v
d=2.7v

[mon2]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

Did you miss reading post #5 ?

[Jokerx84]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

You have 2 x DC-in mosfets on this logic board.

Using the resistance mode, check the mosfet condition of each.

Remove all power / no battery.

Meter in resistance mode.

Check the resistance across the mosfet pins to check if it is defective.

Source (1-2-3) & Drain (5-6-7-8)
Source (1-2-3) & Gate (4)
Gate (4) & Drain (5-6-7-8)

Post the above readings (and the meter scale) for PU4401 and then again for the next mosfet PU4402 that follows. A low reading = defective mosfet.


reference reading (see the resistance table):
http://electronicsbeliever.com/how-t...0good%20MOSFET.

Sorry!

PU4401
PU4402
Source (1-2-3) & Drain (5-6-7-8)= 1.1Mohm
Source (1-2-3) & Gate (4)=1.1Mohm
Gate (4) & Drain (5-6-7-8)=1.2Mohm

[mon2]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

The resistance readings are the same for BOTH mosfets ?

If yes, the mosfets are fine. Will review the voltages once at the office but the GATE voltage of PU4402 is a suspect.

[mon2]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

PU4402 = battery mosfet so it is correct that PU4402 (P-channel) will remain OFF with the missing battery using the posted gate voltage. Gate has to be more negative than the SOURCE voltage to turn this mosfet ON.

Q: Do you have the battery installed on this unit ? Believe that you do not but there is a d=2.7v reading ?

Can you confirm this ?

Next, remove all power -> perform the same resistance checks on the battery charging mosfets @ PU4403 & PU4405. Post the resistance values & scale used on your meter.

[Jokerx84]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

PU4402 = battery mosfet so it is correct that PU4402 (P-channel) will remain OFF with the missing battery using the posted gate voltage. Gate has to be more negative than the SOURCE voltage to turn this mosfet ON.

Q: Do you have the battery installed on this unit ? Believe that you do not but there is a d=2.7v reading ?

Can you confirm this ?

Next, remove all power -> perform the same resistance checks on the battery charging mosfets @ PU4403 & PU4405. Post the resistance values & scale used on your meter.

sorry I didn't have time

[mon2]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

Do you have the SAME resistance readings on both of the battery charging mosfets ?

To confirm again, if you remove the BATTERY - you still read ~2v7 on the battery connector?

[Jokerx84]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

Do you have the SAME resistance readings on both of the battery charging mosfets ?

To confirm again, if you remove the BATTERY - you still read ~2v7 on the battery connector?

yes

[mon2]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

measure the voltage on S-D-G pins of the battery charge mosfets.

Are the voltages the same if the battery is removed? If the battery is installed?

[Jokerx84]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

same voltage with and without accumulator

pu4401
s=20.1v
g=6.7v
d=20.1v

pu4402
s=20.1v
g=20.1v
d=2.7v

[mon2]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

There are 2 more mosfets that are used to charge the battery.

Can you post their voltages on each pin and the PQ label for each?

Do not have the schematic at this time to check their location.

[Jokerx84]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

SiS412DN PU4403 and PU4405

PU4403
S=2.7V
D=20.3V
G=2.7V

PU4405
S=0V
D=0V
G=2.7V

[mon2]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

Remove all power. Check the resistance (PU4403 and PU4405) of these same mosfets as before.

[Jokerx84]

Re: Lenovo V110-15IAP It won't turn on, it won't charge

PU4403
PU4405
Forrás (1-2-3) & Lefolyó (5-6-7-8) = 1 Mohm
Forrás (1-2-3) & Kapu (4) = 1 Mohm
Kapu (4) & Lefolyó (5-6) -7-8) = 1 Mohm