compaq can power on batttery but not by charger

[sasser]

hye need forumer help. i got 1 compaq v3000 intel model. when power on with battery the display come. but when pull out the battery and put adapter charger laptop can power on but no display. anyone had face with this problem too? already chekck u4 mosfet and u10 mosfet. pin 123 got 19v but pin 5678 no volt.

[alihomee]

Re: compaq can power on batttery but not by charger

see for charger ic

[sasser]

Re: compaq can power on batttery but not by charger

use maxim 8725e. i check voltage at pin 95v 10,11,12,13 no volt

[dj_ricoh]

Re: compaq can power on batttery but not by charger

you need to focus on PIN 1 , 3 and 6
post results from those pins

[sasser]

Re: compaq can power on batttery but not by charger

ok i will post results here Thanks dj . As i know from dj _ricoh said pin 1 for ACIN pin 3 for DCIN and pin 6 for ACOK. ACIN and DCIN from adapter input . and ACOK from LDO,what means LDO ? and . what are connection do here with display ? seem like shorted cap in that area ?when put adapter no display but ok with battery.

[dj_ricoh]

Re: compaq can power on batttery but not by charger

post the result here

[dj_ricoh]

Re: compaq can power on batttery but not by charger

LDO provide 3.3V for the chip it self in order to set REF voltage and gives voltage to mosfet that charge the battery.
results first so we can see what is going on

[sasser]

Re: compaq can power on batttery but not by charger

i got 19.12v on pin1 , 3.08 on pin 3 and 3.27v on pin 6. when power on state pin1 drop to 18.77v , 3.08 on pin3 then 3.27v on pin 6.

more info i measure volt on U4 mosfet pin 5678 no volt but present volt on gate , 1,2,3 all got 19v.

u10 also same volt as U4 no volt on source.

put battery+adapter back also got same reading.

[dj_ricoh]

Re: compaq can power on batttery but not by charger

i hope you get it.
IF PIN 3 ACIN its 3.3v over 1.5V , ACOK needs to be Low,
ACOK its high when there is no ACIN.
get it?
if ACIN High and ACOK high the max its FUBAR.

[sasser]

Re: compaq can power on batttery but not by charger

so solutions is need replace with the new one ?

[dj_ricoh]

Re: compaq can power on batttery but not by charger

yee

[sasser]

Re: compaq can power on batttery but not by charger

already replace but still the same. all volt also same

[dj_ricoh]

Re: compaq can power on batttery but not by charger

same voltage?

[sasser]

Re: compaq can power on batttery but not by charger

yes pin1 i 19.12v 3.08 on pin 3 and 3.27v on pin 6. on psu read current in 0.7200.

[dj_ricoh]

Re: compaq can power on batttery but not by charger

pfff
insert the bat in and check the pins from the battery(socket)

[sasser]

Re: compaq can power on batttery but not by charger

bat pin pin1 11.4v pin2 3.23 v pin 3 3.23v the rest no volt. the i check maxim chip not voltage at pin1 pin3 and pin6

[sasser]

Re: compaq can power on batttery but not by charger

current measured only 0.7200A when adapter plug in with laptop power on. this not normal reading.