[help] a2141 motherboard 820-01700 completely dead

[phantomEVO]

history "suddenly dead"

no water damage, motherboard seems perfect.when i try to power it on, i have no activity at all..no fan spin...

https://vimeo.com/718664957

[mon2]

Re: [help] a2141 motherboard 820-01700 completely dead

Can you update your last thread for proper closure ?

[phantomEVO]

Re: [help] a2141 motherboard 820-01700 completely dead

done! could you help me with this? i know you are the best of the best!

[mon2]

Re: [help] a2141 motherboard 820-01700 completely dead

Thanks for the update.

Your video is showing power cycling from the current draw.

Are you using the original power adapter ? Or at least a power adapter that can supply the required current ?

Review the voltage @ F7000 (PPBUS_G3H).

Meter in DC volts scale (20v is ok).

What is the voltage to ground ? Is it stable or is it pulsing ?

[phantomEVO]

Re: [help] a2141 motherboard 820-01700 completely dead

at this moment i'm using a under rated power supply (65w) just to test, and not the original one. but i can have it without problem!
on f7000 voltage is not stable...

sometimes it is 9v some times 12v

[mon2]

Re: [help] a2141 motherboard 820-01700 completely dead

Remove F7000 & F7001. Power up and check if the PPBUS_G3H is stable @ pin # 1 of F7000 / F7001.

What is the voltage of PPBUS_G3H ?

Is the PPBUS_G3H rail stable without the fuse (and downstream load) ?

This is to confirm if the fault is on the producer side (U7000) or consumer side (downstream from F7000 / F7001, pin # 2).

If the PPBUS_G3H (producer side) is stable, then remove all power.

Meter in resistance mode -> check the resistance to ground of PPBUS_G3H, F7000, pin # 2 (downstream side).

Resistance of downstream side ?

[phantomEVO]

Re: [help] a2141 motherboard 820-01700 completely dead

if i remove the battery, PPBUS_G3H is stable at 12,6v

[mon2]

Re: [help] a2141 motherboard 820-01700 completely dead

Interesting. Q7065 (battery mosfet) is a suspect.

Remove all power & no battery. Meter in resistance mode (start with lowest scale).

Check the resistance across the mosfet Q7065 as follows:

source (1-2-3) & drain (5-6-7-8)
source (1-2-3) & gate (4)
gate (4) & drain (5-6-7-8)


Post the resistance readings & meter scale used for the measurements.

If you see '1' on your multimeter, switch to the next high scale.

You are checking for a low resistance which often means the mosfet is defective and should be replaced.

Update - found this on the internet...

< see attached >

[phantomEVO]

Re: [help] a2141 motherboard 820-01700 completely dead

removing f7000 and f70001 i have stable PPVBAT_G3H_CHGR_REG stable (pin 1 of f7000 / f7001)

with my multimeter (fluke 17b+) auto scale mode, black probe on ground and red on pin 2 of f7000 i have 16,6 mohm

So you think that the battery Could be the provlem?

If it is right to check battery voltage Here, so the battery is Dead: i have 0,009v…

https://ibb.co/TvT8XSd

[mon2]

Re: [help] a2141 motherboard 820-01700 completely dead

See my last post - your power adapter is under rated. Also you need a working battery to power this beast.

[phantomEVO]

Re: [help] a2141 motherboard 820-01700 completely dead

how to check if battery is working

[mon2]

Re: [help] a2141 motherboard 820-01700 completely dead

Confirm the condition of the battery mosfet with the resistance checks. Post the readings.

[SMDFlea]

Re: [help] a2141 motherboard 820-01700 completely dead

how to check if battery is working

https://logi.wiki/index.php?title=Ma...e_dead_battery