HP G62 Model G62-b50SG TIC sound

[samtron786]

Hello
You can see some voltages as 3.3V, but 19V is not stabilized and rises and falls with each blink
The Power LED button will flash and you can hear a TIC sound with each flash.
where does the TIC sound come from?
Thank you

[mcplslg123]

Re: HP G62 Model G62-b50SG TIC sound

There is some short on your motherboard. measure resistance to GND on all coils as well as CLR.

[samtron786]

Re: HP G62 Model G62-b50SG TIC sound

I found the problem
PQ55 Mosfet replaced now turns on but turns off again after 10 or 20 seconds later

PQ55
D=9.80V
G=19V
S=19V

[mcplslg123]

Re: HP G62 Model G62-b50SG TIC sound

Do you get display on screen ? Is your motherboard with ati graphics chip? mention mb part number like DAX1....

[samtron786]

Re: HP G62 Model G62-b50SG TIC sound

PM_A_HPC_S_MV_MB_V1

Yes, it starts normally

[samtron786]

Re: HP G62 Model G62-b50SG TIC sound

Another question: where does the sound come from the coil or electrolytic capacitors?

[mcplslg123]

Re: HP G62 Model G62-b50SG TIC sound

Its difficult to pinpoint the source of ticking sound in such cases as whereever you put yours ears,it'll always confuse you. Model is with discrete graphics or not? Resistance to GND on all coils? These were highlighted earlier but you didnt answered them.

[samtron786]

Re: HP G62 Model G62-b50SG TIC sound

This is the motherboard pictures

here 3 coils beep and the values from both sides

75,8 75,8
13,8 13,8
12,6 12,6

[samtron786]

Re: HP G62 Model G62-b50SG TIC sound

P/n :01013tm00-600-g rc8f32003ah1
the fan can rotate

[samtron786]

Re: HP G62 Model G62-b50SG TIC sound

What do you have to do when something like this happens?
cmos reset 502, then the laptop turns off and no longer starts, you have to wait a day

[mcplslg123]

Re: HP G62 Model G62-b50SG TIC sound

This board is too old to waste your time. It has a discrete amd graphics as well which invariably fails after so many years.

[samtron786]

Re: HP G62 Model G62-b50SG TIC sound

Yes, it has an ATI graphics chip
When I start the laptop the fan also turns
the coils don't all beep

[piernov]

Re: HP G62 Model G62-b50SG TIC sound

Northbridge is also well known for being unreliable.
Best solution is to replace motherboard (+CPU and heatsink) with an Intel platform without dGPU. There are a few Intel boards for G62 but not sure which one would fit exactly your chassis, possibly the PM_I_HPC_S MV_MB_V3.
Also gives better performance, battery life and less heat.

[samtron786]

Re: HP G62 Model G62-b50SG TIC sound

OK thanks
Battery is also being charged
then I have to see if I can find another motherboard