Aspire 3 and KB9022Q (SIO) chip

[Jane]

I have a problem with +5V ALW and +3V ALW. These voltages are generated by RT6575 IC.
For correct function RT6575 needs 5V_EN and 3V_EN. These values are provide by KB9022Q chip.
I replaced KB9022Q and flashed, yet not 5V_EN and 3V_EN.

My question:
If there is no 5V_EN and 3V_EN , does it mean that I did not flash correct EC( embedded controller firmware) to that KB9022Q?
Or 5V_EN and 3V_EN does not depend on firmware running in KB9022Q?
Thank you for help

[mcplslg123]

5V_EN/3V_EN does depends on the correct firmware in SIO. But since the firmware flashed succesfully,SIO is very likely ok.

To me it appears classic Acer thermal protection for which i have provided solution in this forum.

Tell us the mb markings and link schematic if available.

[Jane]

Thank you for your reply.
Yes, I successfully flashed SIO. But I do not know if the firmware was exactly right for my version of mainboard
I have DH5JV LA-G021P mainboard. Can you please let me know how to check( so that I know)if it is classic Acer thermal protection error? And how to repair it?
Thank you

[SMDFlea]

KA8G116A.rom https://www.badcaps.net/forum/troubl...57#post3215957

[mcplslg123]

First try flashing the EC linked by smdflea. If situation dont change then

01.Check voltage on both sides of R3926
02.Voltage on D2012-both pins.

If its due to thermal protection,there is a way to bypass it. I'll guide you to that effect but first the measurements please.

[Jane]

I flashed KA8G116A.rom but still no correct 5V_EN/3V_EN voltages.
I measured:
5V_EN is 3.28V
3V_EN is 0V


R3926: both sides have 0V
D2012: this diode is missing on the mainboard. Maybe someone else already repaired mainboard or is it a factory modifications?. Is it necessary to be there?
Voltages on D2012- pin 1 - is about 3.3V; pin 2 is 0V

Thanks again for help

[mcplslg123]

D2012 is marked@ in schematics-so not used by factory. Now follow these 2 steps carefully
01.Remove R3926
02.Put a jumper wire between Pin1 & 2 of D2012.

Hopefully your problem may be solved.