g72-120ev charging battery problem

[gcomputers]

About after 5 min charging don't charge anymore and shut down the laptop. with another battery the problem goes about 30 min. without battery the laptop stay always on without problem. i tested PQ52 its ok and PR235 19v OK.
thanks

[Ramee]

Re: g72-120ev charging battery problem

Try to replace the thermal paste and thermal pad, but use the high quality only.
Don't put the battery, could be bad.

[gcomputers]

Re: g72-120ev charging battery problem

Thanks for the reply i checked the temp are ok not have problem with this , with another functionally battery charge 70% and stop charging and the laptop work until the battery ends.

[rookieme]

Re: g72-120ev charging battery problem

Have you tested with another power supply?
I have to mention that I had similar issue with an HP and did a reflow at the charging circuit area that fixed the problem.

[gcomputers]

Re: g72-120ev charging battery problem

Yes a tested it with another charger and reflowed the PU6 but the same problem charge 10 minutes and stop charging . but stay on until the battery ends. also i flashed the bios from windows

[ben7]

Re: g72-120ev charging battery problem

I'm just thinking, it seems like the charging circuit might not be sensing the current or voltage correctly. Either that, or maybe PU6 is bad.

I'd check some of the FETs in the charging circuitry, like PQ55, PQ3, and PQ4.

What voltage is on the "BATCHG" when charging, and not charging?

Also, what voltage do you measure across PR228 when it is actually charging the battery? PR228 appears to be for monitoring how much current is going into the DC-DC converter for the battery charging.

(For future reference, the battery charging circuitry is on page 39)

[gcomputers]

Re: g72-120ev charging battery problem

thanks for reply ben7 and sorry for late reply.
i measure

PR228=28v thats come from PQ58 i think is normal

PQ3:
D=19v SG=0700
PQ4:
DSG=0700 without battery

PQ3:
D=19v SG=12v
PQ4:
D=12v SG=0 with battery in charging
sometime charging 3 min sometime more 3 and sometime some seconds.
everything i measure with functional battery.
what do u think?

[Erat]

Re: g72-120ev charging battery problem

For me this happen to an acer netbook with the excact same problem and if you beleive it or not it was a faulty ram!

[gcomputers]

Re: g72-120ev charging battery problem

really ... i will try

[gcomputers]

Re: g72-120ev charging battery problem

Erat i try the ram is the same problem.

i think is PQ4 defective

[gcomputers]

Re: g72-120ev charging battery problem

Any help please

[hansie55]

Re: g72-120ev charging battery problem

I worked on a G72 with the problem: when switched on, it switch off right away and no charging. I found out, that the system is very critical with the smart ID (middle pin) voltage. I changed the middle pin resistor to higher on the plug and the charging problem was solved.

[gcomputers]

Re: g72-120ev charging battery problem

thanks for the reply the laptop stay on and work perfect without battery but charge the battery 3 minuts or more and stop charging , anyway a make a test with the middle pin resistor But on the board or the middle pin on power supply?

[hansie55]

Re: g72-120ev charging battery problem

In the schematics, Smart ID goes from page 33(slot9) to page 26 (EC/KBC) and by me it determined wether to charge or not.

https://www.badcaps.net/forum/showthread.php?t=46278

[hansie55]

Re: g72-120ev charging battery problem

Here are 2 links to show where I'm coming from. The problem is well known, but there is no solution out there. This is when you have those unexplainable issues.

http://h30434.www3.hp.com/t5/Other-N...r/td-p/1153001

https://www.google.nl/search?q=hp+g7...O8SE7gbn_ID4Bw