Lenovo A14HV0X rev 4.0

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suryajaved
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Lenovo A14HV0X rev 4.0

Post by suryajaved » Tue Sep 05, 2017 11:10 pm

Tips N Tricks - 4
Lenovo laptop
Pcb model : A14HV0X rev 4.0
Problem Reported :- No Power On,
Observation :- Power on process is little bit different to others models, as we have seen most of the laptop motherboard wake on 3v, 5v pwm supply after full fill basic requirements of io controller , but that case is little bit different , one of the comman IO requirement not fulfilled WRST# / LRST1# that is EC reset must be pulled up with 3v alw , was missing,
Solution :-
Start checking power on requirement step by step ,
VIN ,3.3/5V ,PwrBtn voltage ,RTC_VCC, 32.768khz Frequncy
Everything was available but PwrBtn_out not present,
Someone already made an attempt to reprogram bios
So firstly checked with bios but no luck ,
Now Big suspect to any one of io controller requirement is missing,
Then started searching for IO requirements
Found WRST#/ LRST#( EC_Reset) missing
Further tracing for problem found 3.3V on pull up resistor R451 but not on PIN 14 of IO controller
So biggest and only suspect as seen in schematic is C661
Removed and Bingo
The board turned on and
Job done ✅
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PINTUSINGH
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Re: Lenovo A14HV0X rev 4.0

Post by PINTUSINGH » Sat Dec 16, 2017 11:54 pm

GREAT

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Re: Lenovo A14HV0X rev 4.0

Post by syednadeemulla » Thu Feb 01, 2018 12:39 pm

A14HV0X REV.:4.0 bios

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Dhirendra Gaur
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Re: Lenovo A14HV0X rev 4.0

Post by Dhirendra Gaur » Thu Feb 01, 2018 5:43 pm

syednadeemulla wrote:
Thu Feb 01, 2018 12:39 pm
A14HV0X REV.:4.0 bios
viewtopic.php?f=41&t=1388&p=2577&hilit=A14HV0X#p2577

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