HP CQ71;No LEDS except connector LED 6 sec.

[patpin]

Hallo,
I m checking a MOBO DA00P6MB6D0 rev D.
With or without battery I see a Led coming ON at the ext. power connector when connecting it. After 6 seconds it goes OFF. No other LEDS ON; Pow butt does nothing.
At the ext.DC IN connector:
pin 3 =1,5V=also present when LED OFF
Pin 4: 2,65V when LED ON ; otherwise 0V
Can someone help me? Thanks

[caspian]

Re: HP CQ71;No LEDS except connector LED 6 sec.

check DC jack pins for being shorted.

[khaahk]

Re: HP CQ71;No LEDS except connector LED 6 sec.

Try bios first.

[patpin]

Re: HP CQ71;No LEDS except connector LED 6 sec.

The S5_ON Doesnt come ON after pressing POW BUTTON. KBC death? How can I test?

[patpin]

Re: HP CQ71;No LEDS except connector LED 6 sec.

check DC jack pins for being shorted.

Not shorted; I have 19V at PQ48.

[dycc]

Re: HP CQ71;No LEDS except connector LED 6 sec.

Give bios pin 8 and pin 5 voltages ???????????

Normally you should have 3.3v at pin 8 and 0.2 at pin 5

[patpin]

Re: HP CQ71;No LEDS except connector LED 6 sec.

Give bios pin 8 and pin 5 voltages ???????????

Normally you should have 3.3v at pin 8 and 0.2 at pin 5

Forgot to mention that the LED at the female external-PS-connector remains OFF. Havent found the label for that LED.
I have charged the MBAT to 10.5V.
Is correct 3.3V at 8; only 0,033 at pin 5. CMOS BATT+ is 2.96V
The power button goes to 0V on pressing.
The RSMRST# remains at 0V also on pressing.
DNBSWON#1 measured on D18: is 3,35 and remains when pow.butt pressed (with DMM and Bitscope)
LID_EC# is 3,3V so I guess this is an OPEN LID .
I have 3.3V at KBC on PIN 67. KBC is not hot.
I consume 10,48 mA; when I press power button: 10,55mA.

[khaahk]

Re: HP CQ71;No LEDS except connector LED 6 sec.

You can make measurements until the end of time, try to reprogram bios at first. If no change then start to measure again.

[patpin]

You can make measurements until the end of time, try to reprogram bios at first. If no change then start to measure again.

The problem is I have no programmer. On the other hand I have a scope. Do you have an idea on why PIN 5 of BIOS is so low ?

[khaahk]

Re: HP CQ71;No LEDS except connector LED 6 sec.

It is data line, so if no data or data is infrequent then multimeter shows mean value which is very low. If you have a scope then look if impulses are present on pin 2, 5, 6. But it still gives you nothing if you have no idea what data should be moving. Find a spi programmer if you want to move forward with repairing it.

[patpin]

It is data line, so if no data or data is infrequent then multimeter shows mean value which is very low. If you have a scope then look if impulses are present on pin 2, 5, 6. But it still gives you nothing if you have no idea what data should be moving. Find a spi programmer if you want to move forward with repairing it.

OK. In the mean time can we look at the charger not functioning? charge led is OFF. BAT V remains 10.3V
PU5 has 5V on PIN 1;
ACSET (on the PR99): 2,09V
6251EN: (on the PR98): 1,15V
UGATE (on the PQ6 pin 4): 10V; no pulses; L gate 0V but no pulses (pin 4 on PQ4)
VREF PIN 8: 2,77V
Should receive CC-SET from KBC: I measure (on PR102): OV (I think it should be 1.2V)
Probably same cause: KBC not functioning?

[patpin]

Re: HP CQ71;No LEDS except connector LED 6 sec.

Nobody an idea?

[JaroTech]

Re: HP CQ71;No LEDS except connector LED 6 sec.

Hi, what voltage do you have on pin 2 of PQ7 and pin 2 of PQ67?