Power Problem [can't resolve, plz help]

[dspok]

i had a dv6700 series laptop. i found pq3 brunt, changed it. now voltage on pl2 and pl3 comes 18v drops to 12v continuously. very low tik tik sound comes from somewhere which could not rectify and laptop doesn't turn on athough there is 3.3v on power button.

charger ic pu1 is ok to confirm i have changed it, chaged sio same problem.
pq61 has same voltage drop, also pin6 of battery connector has same problem.

before laptop was turning on but battery won't charge.
screwed up, please somebody help to solve the problem.

[ktmmotocross]

Re: Power Problem [can't resolve, plz help]

"now voltage on pl2 and pl3 comes 18v drops to 12v continuously"

18V on battery, not good. bad charging voltage driving.. remove pq3 and check voltage

[dspok]

Re: Power Problem [can't resolve, plz help]

I checked after removing pq3, voltage is ok but laptop doesn't turn on. I suspect ACOK signal is bad but couldn't solve it.

[dj_ricoh]

Re: Power Problem [can't resolve, plz help]

find PL12 and PL14 and see if you got 3.3v and 5v

[dj_ricoh]

Re: Power Problem [can't resolve, plz help]

if your near that ISL ic PU10 post here the voltages

[dspok]

Re: Power Problem [can't resolve, plz help]

Can find 3.3v and 5v but i will post pu10 voltage later. Thanks in advance.

[dj_ricoh]

Re: Power Problem [can't resolve, plz help]

its this with AMD cpu?

[dspok]

Re: Power Problem [can't resolve, plz help]

No it is intel. 5v and 3.3v also drops to 4.2v and 2.2v following tik tik sound.

[dspok]

Re: Power Problem [can't resolve, plz help]

As 5v and 3.3v was droping, i changed isl chip. Now 5vpcu is ground, don't know from where this voltage linked. All 5vpcu is ground. Please suggest.

[Ramee]

Re: Power Problem [can't resolve, plz help]

You are asking for help, but dj_ricoh asked you to write down the PU10 voltages, but you did not do it.

[dspok]

Re: Power Problem [can't resolve, plz help]

@Rame
I understand dj_ricoh asked for PU10 voltage but I followed stupid idea to change it, which caused 5VPCU circuit to ground.

[Ramee]

Re: Power Problem [can't resolve, plz help]

redo redo!

[dj_ricoh]

Re: Power Problem [can't resolve, plz help]

@Rame
I understand dj_ricoh asked for PU10 voltage but I followed stupid idea to change it, which caused 5VPCU circuit to ground.

try to resolder it!

maybe bad contact or some flux

[dspok]

Re: Power Problem [can't resolve, plz help]

Thanks dj_ricoh but i think I have more problem now. Even I remove PU10 there is still ground at PL14.
PL5, PL6 also ground where as PU8 is ok. Pin 1,2,3 on PQ61 ground too. Looks like my bad idea fried mb.

[dj_ricoh]

Re: Power Problem [can't resolve, plz help]

ok lift pl14 pl5,6 and see where is the short
to IC or other side

[dspok]

Re: Power Problem [can't resolve, plz help]

It is to the other side.

[dj_ricoh]

Re: Power Problem [can't resolve, plz help]

on every coil?

do you have a lab PSU?

[highpulse]

Re: Power Problem [can't resolve, plz help]

my friend the tik tik noise come from a bad FET , also chek for components above the cpu socket usually they have a black tape on it , there is a component responsable for the acok sign that will make the charger ic drive the 24 volts for the gate of the main Powermosfet this component is on the right sde of the PC195 IC with 6 legs.. is a very common fault on this laptop .personally fixed a few , also chek for PD17 and Q40 and reading schematic pin 6 of schematic should be giving you lt least 18.8 volts , also as PD17 on both sides

[highpulse]

Re: Power Problem [can't resolve, plz help]

now for the 5 volts line coil , so very probably when you were messing with 19 volts line , you damaged the the mosfets on that line . chek mosfet if bad on board , remove and test outside , and with mosfet lifted , chek for GND on coil.
if problem persist , lift one leg of the coil and chek wich side is shorting to gnd , and read schematic after this . to chek the main component until +5va out , if all seems fine , then start injecting 2 volts and start increasing slowly , always chek amperage comsuption ,and to help you out , start cheking for heat points on the board , after you find it , just spray a bit of IPA to make sure of the exact component that is getting hot , , any help just ask mate

[dj_ricoh]

Re: Power Problem [can't resolve, plz help]

Just spray a bit of IPA to make sure of the exact component that is getting hot

o that`s so freaking Cool! cuz IPA does not drive the current! freaking GENIUS!