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LENOVO NM-A841 Missing 5v/3v voltages
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Re: LENOVO Missing 5v/3v voltages
Originally posted by SMDFlea View PostAccording to the nm-a841 schematic no ,but schematics aren't always right even though you expect them to be. It can't be 19v on pin 11. Let's gets other members views and fix this together
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I read it wrong?
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Re: LENOVO Missing 5v/3v voltages
Originally posted by stingerchamp View PostIf you look at datasheet abs max Volt of en is 25v
I read it wrong?
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Re: LENOVO Missing 5v/3v voltages
Originally posted by kalilinux25 View Postgos via the board sir
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Re: LENOVO Missing 5v/3v voltages
Originally posted by SMDFlea View PostI read a post on a russian forum that pin 11 is indeed 19V .Just to be sure though inject voltage voltage on theat but but keep it low and slowly crank the voltage up.If you can get up to 19V then run a jumper between 2,3,4, or 5 to 11
PU401
PIN1- 0V
PIN2,3,4,5 - 19V
PIN6 0V
PIN7 0V
PIN8 0V
PIN9 0V
PIN 10 0V
PIN 11 19V
PIN12- 0V
PIN13-0V
PIN14-0V
PIN15-1.3V
PIN16 - 0V
PIN17- 0V
PIN18-0V
PIN19-0V
PIN20-0V
PU301
PIN1 - 19V
PIN2 - 19V
PIN3 - 19V
PIN4 - 19V
PIN5 - 19V
PIN6 - 5.8V
PIN7- 0V
PIN8 -0V
PIN9-0V
PIN10-0V
PIN11-0V
PIN12-19V
PIN13-19V
PIN14 -19V
PIN15- 5.8V
PIN 16- 0V
PIN13
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Re: LENOVO Missing 5v/3v voltages
Pu301 is ok
Change pu401
Check capacitor pc422
Apply 3.3v with dc at pc422 and check with multimeter voltage drops or stable if stable change pu401Last edited by stingerchamp; 01-08-2021, 10:55 PM.
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Re: LENOVO Missing 5v/3v voltages
Originally posted by stingerchamp View PostPu301 is ok
Change pu401
Check capacitor pc422
Apply 3.3v with dc at pc422 and check with multimeter voltage drops or stable if stable change pu401
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Re: LENOVO Missing 5v/3v voltages
Originally posted by stingerchamp View PostConfirmed
Change pu401 and likely KBC as well
PU401
PIN1 - 0V
PIN2 - 19V
PIN3 - 19V
PIN4 - 19V
PIN5 - 19V
PIN6 - 0V
PIN7 - 0V
PIN8 -0V
PIN9 -0V
PIN10 -0V
PIN11 -19V
PIN12 -0V
PIN13- 0V
PIN14 -0V
PIN15 - 0V
PIN16 - 0V
PIN17 - 0V
PIN18 - 0V
PIN19 - 0V
PIN20 - 0V
ive tested the impedance of PL401 7KOHMS
PL402 27 Kohms is this normal sir?
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