HP compaq presario mobo; not charging and no power led ;

[patpin]

CQ71 model 450EB ( DA00P6MB6D0 rev D ) ; AC power led at AC connector is ON; the one at the bottom left of the PC (on the audio board) indicating the presence of an AC external PSU is OFF, as is the charging LED;
I have been looking for the reason why the batt is not charging and discovered that the PU5 (ISL6251) pin called CHLIM is at 0V which shuts down the charger IC. The CHLIM is coming from the U20/KBC (ICH9) CCset pin (pin 68): This pin is at 0 at the KBC; My question is why. I checked the TEMP_MBAT: 1.54V; is this OK? and are there other signals to consider at the KBC which could influence the CCSET. (PS all powers are OK).
(diagram on : http://www.s-manuals.com/pdf/motherboard/quanta/quanta_op6,_op7_ra_schematics.pdf )

[Th3_uN1Qu3]

Re: HP compaq presario mobo; not charging and no power led ;

First flash BIOS. Then try another battery. Then if neither works, we'll try to figure out what causes the charge controller to be turned off, but 90% of the time it is a bad battery.

[patpin]

First flash BIOS. Then try another battery. Then if neither works, we'll try to figure out what causes the charge controller to be turned off, but 90% of the time it is a bad battery.

Dont have a bios flashing tool or a spare battery. The battery tension is 10.8V? Can you tell me why the CC-set on the KBC is set to 0V. Can it be because the CMOS batt is 2.96V. Thanks