HP 250 G5 / BDL50 LA-D704P missing ACOK

[eniac22]

Hi i have problem with HP 250 G5 / BDL50 LA-D704P no power / no light on charger led, the same problem with charged battery.

I measured the following voltages with charger and without battery, i believe voltages is correct except ACOK.


Pin 1 ACN : 19,4V
Pin 2 ACP : 19,4V
Pin 3 GMSRC : 19,4V
Pin 4 ACDRV : 25,2V
Pin 5 ACOK : 0V
Pin 6 ACDET : 2,6V
Pin 7 IOUT : 0V
Pin 8 SDA : 0V
Pin 9 SCL : 0V
Pin 10 ILIM : 0V
Pin 11 BATDRV : 0V
Pin 12 SRN : 3,1V
Pin 13 SRP : 3,1V
Pin 14 GND : 0V
Pin 15 LODRV : 0V
Pin 16 REGN : 6V
Pin 17 BTST : 5,8V
Pin 18 HIDRV : 3,1V
Pin 19 PHASSE : 3,1V
Pin 20 VCC : 19V

[mon2]

Re: HP 250 G5 / BDL50 LA-D704P missing ACOK

Also, pins 8 & 9 are floating. This implies your always on rail is not working.

Trace the pull up resistors to the always on rail and confirm that voltage rail is enabled. You could have a bad cap on that rail. A very common fault.

The ACOK likely is also pulled up to the same faulty rail so is showing 0v.

[mcplslg123]

Re: HP 250 G5 / BDL50 LA-D704P missing ACOK

+3V LDO is missing as @mon2 has advised. Findit out and check resistance on +3V LDO.

[eniac22]

Re: HP 250 G5 / BDL50 LA-D704P missing ACOK

+3V LDO produced from PU2 (RT8243AZQW) ? if so i get this values on PU2

Pin 11 VIN: 19,5V
Pin 12 ENLDO : 4,48V

all other pins has 0V

[mon2]

Re: HP 250 G5 / BDL50 LA-D704P missing ACOK

Post the voltage on pin #15 (+3VL) of PU2.

From your last post, PU2 may be defective.

Remove all power. Measure the resistance to ground of pin 15 on PU2.

[eniac22]

Re: HP 250 G5 / BDL50 LA-D704P missing ACOK

All pins of PU2 have 0 volt exept pin 11 and pin 12, so the pin 15 has 0V.

Resistance to ground of pin 15 when i measure after remove the power supply is 0 ohm and if i measure after a while the resistance is 66,7κohm

[eniac22]

Re: HP 250 G5 / BDL50 LA-D704P missing ACOK

I replace PU2 (RT8243A) and now i have white led on the charger cable but the laptop not power on after i press the power button.

PU201:


Pin 1 ACN : 19,48V
Pin 2 ACP : 19,48V
Pin 3 GMSRC : 19,45V
Pin 4 ACDRV : 25,1V
Pin 5 ACOK : 3,2V
Pin 6 ACDET : 2,63V
Pin 7 IOUT : 0V
Pin 8 SDA : 3,27V
Pin 9 SCL : 3,27V
Pin 10 ILIM : 0,45V
Pin 11 BATDRV : 3,15V
Pin 12 SRN : 3,13V
Pin 13 SRP : 3,14V
Pin 14 GND : 0V
Pin 15 LODRV : 0V
Pin 16 REGN : 6,08V
Pin 17 BTST : 5,86V
Pin 18 HIDRV : 3,14V
Pin 19 PHASSE : 3,14V
Pin 20 VCC : 19,16V


PU2:


Pin 1 FB1 : 0V
Pin 2 ENTRIP1 : 0V
Pin 3 TON : 0V
Pin 4 ENTRIP2 : 0V
Pin 5 FB2 : 0V
Pin 6 PGOOD : 0V
Pin 7 BOOT2 : 0V
Pin 8 UGATE2 : 0V
Pin 9 PHASE2 : 0V
Pin 10 LGATE2 : 0V
Pin 11 VIN : 19,48V
Pin 12 ENLDO : 4,47V
Pin 13 ENIM : 0V
Pin 14 LDO5 : 5V
Pin 15 LDO3 : 3,27V
Pin 16 LGATE1 : 0V
Pin 17 PHASE1 : 0V
Pin 18 UGATE1 : 0V
Pin 19 BOOT1 : 4,55V
Pin 20 BYP1 : 0V

[mon2]

Re: HP 250 G5 / BDL50 LA-D704P missing ACOK

There are a lot of 0V on PU2. The issue may be linked to pin #13 of PU2 which mates with the EC and believe that EC_ON is a digital GPIO enable pin. Inside the EC is usually a 8051 microcontroller that requires firmware to perform its task. No experience with the EC reprogramming so wait on others to reply with their feedback.

Details of PU201 are looking very good.

[mcplslg123]

Re: HP 250 G5 / BDL50 LA-D704P missing ACOK

Yes, EC_ON comes from SIO and it enables the 3/5V regulator. Could be bad sio,bad dc jack,bad ec firmware, rtc section fault.

[razadom]

Re: HP 250 G5 / BDL50 LA-D704P missing ACOK

Hi all
I have the same problem after changing cpu mosfet and controller.
Before the laptop go on but no voltage on cpu and vgt coil.
I have reprogrammed bios also
So i think the same as you propose that the ec must be reprogram
If someone has idea share please

[tecnicojr]

Re: HP 250 G5 / BDL50 LA-D704P missing ACOK

I have a similar case in the line of three marks a resistance of 24.3 with respect to ground

[mon2]

Re: HP 250 G5 / BDL50 LA-D704P missing ACOK

Tengo un caso similar en la linea de tres me marca una resistencia de 24.3 con respecto a tierra

I have a similar case in the line of three marks a resistance of 24.3 with respect to ground