hp 14-am096tu system fan error 90b

[Romy2018]

I need help on this hp 14-am096tu laptop cannot boot because it has an error of system fan error 90b, i check the fan and removed in the board and check with bench lab by injecting on + and - 3v the fan is spinning. anyone help on this

[caspian]

Re: hp 14-am096tu system fan error 90b

connect the fan to the laptop and just look at the fan when it turns on. then, tell us how the fan behaves during power on and after that.

[Romy2018]

Re: hp 14-am096tu system fan error 90b

i connect the fan to board and turn on and observe the behavior, the fan is not spinning and also it takes 8seconds to display, and also cannot detect hard drive.

[caspian]

Re: hp 14-am096tu system fan error 90b

the fan seems to be healthy and the problem is probably from something else on the mainboard, such as Bios or EC firmware.

[Romy2018]

Re: hp 14-am096tu system fan error 90b

i will try to flash the bios does someone have a good working bios for this please help

[SMDFlea]

Re: hp 14-am096tu system fan error 90b

i will try to flash the bios does someone have a good working bios for this please help

There are 6 different bios for the 14-am series, i posted all the bios in a new thread: https://www.badcaps.net/forum/showthread.php?t=73759
Backup your bios first, find your BID number ,flash the bios.

[Romy2018]

Re: hp 14-am096tu system fan error 90b

thanks smdflea. I tried flashing the bios still the same issue system fan error 90b and cannot detected hard drive.anyone who encounter this problem please help

I have uploaded original dump

[Romy2018]

Re: hp 14-am096tu system fan error 90b

anyone can help me on this please

[Romy2018]

Re: hp 14-am096tu system fan error 90b

anyone can help on this tried everything but still system fan error 90b and cannot detected hard drive

[zpi]

Re: hp 14-am096tu system fan error 90b

Does your HDD get power ? (Does it starts to spin?). I believe same 5v needs to be present for fan and hdd. Are your USB ports working ?

[Romy2018]

Re: hp 14-am096tu system fan error 90b

the hdd not get power and not start to spin same with fan.all usb ports are working ill tried to boot on windows installiotion on flash drive and its detected fine.

[ktmmotocross]

Re: hp 14-am096tu system fan error 90b

fan is driven from its driver through mosfet. so check driver signal and what do mosfet

[Romy2018]

Re: hp 14-am096tu system fan error 90b

I still not solved this problem but i found a clue on this two caps near fan connector there is no 5v and on the other side the one cap near the hdd connector has no 5v also and then this cap is connected to the two caps near the fan connector.but when i reheat the two caps it works and after shutdown and leave the laptop for a couple of hours and tried again i came back to the same issue.anyone could help me on this please!!! i have upload the image

[Romy2018]

Re: hp 14-am096tu system fan error 90b

anyone please help on this please

[Romy2018]

Re: hp 14-am096tu system fan error 90b

i found a 5 leg chip near on dvd connector the pin with the red marked is connected to the caps on the hdd and fan side if you inject 5v there the fan spins

[ktmmotocross]

Re: hp 14-am096tu system fan error 90b

dont have schematic?

check datasheet of that chip what it make and check for voltage on pins

[Romy2018]

Re: hp 14-am096tu system fan error 90b

i cannot find schematic on this model

[SMDFlea]

Re: hp 14-am096tu system fan error 90b

At post #13 you said it worked when you heated the 2 caps, take a picture of that area. Try and trace where those caps go ,if theyre connected to some IC post the part number .

[ktmmotocross]

Re: hp 14-am096tu system fan error 90b

u have to find 5V switch. maybe it is that ic . u must check its datasheet

reheat caps???

[on/off]

Re: hp 14-am096tu system fan error 90b

Would be helped if know mobo code. although there is no schematic at least should find a schematic that is quite close.