6050A2560201-MB-A03 Won't turn on.

[maurovalero]

Hi, working on this Hp EliteBook 840 MB 6050A2560201-MB-A02. The problem with it is that the Power white LED turns on for a while & then turns off by itself. The amps during this 4 sec process is just 0.06 & then back to 0 but battery charges very well taking around 2.7amp in the start. I re-programmed the BIOS chip which I got from this board's string on BADCAPs but no difference. 3.3v & 5v are perfect. No short to ground at all on any rails. Can someone help me diagnosing this fault further. Thanks in advance.

ADP_EN 3,38
LID_SW# 3,29
ADP_DET 3,3
RSMRST# 3,3
KBC_PWR_ON_R 3,3
this are the values in EC U300

[electrocute]

Re: 6050A2560201-MB-A03 Won't turn on.

Any led blinking code sequence on caps lock key or the power led?

[mon2]

Re: 6050A2560201-MB-A03 Won't turn on.

Check for damaged / shorted mosfets on page # 5 of the posted schematic.

1) With the adapter connected & battery removed, what is the voltage reading:

@ Q6009 - pin 3 ?

Q6010 - Source (pin 1-2-3) ?

Q6010 - Drain (pin 8-7-6-5) ?

Q6011 - Drain (pin 8-7-6-5) ?

2) Remove all power.

Meter in resistance mode.

Check & post the resistance for the following:

Q6010

Source & Drain
Source & GATE
GATE & Drain

Repeat the measurements for:

Q6011, Q6000, Q6001

On the topic of resistance measurements, be sure to review the following excellent webpage - see resistance chart:

http://electronicsbeliever.com/how-t...-is-defective/

[Spider1211]

Re: 6050A2560201-MB-A03 Won't turn on.

Did you check your RTC section?

[maurovalero]

Re: 6050A2560201-MB-A03 Won't turn on.

Any led blinking code sequence on caps lock key or the power led?

no secuence, but wifi led and mute is on during 5 seconds and them turn off.

[maurovalero]

Re: 6050A2560201-MB-A03 Won't turn on.

Check for damaged / shorted mosfets on page # 5 of the posted schematic.

1) With the adapter connected & battery removed, what is the voltage reading:

@ Q6009 - pin 3 ?

Q6010 - Source (pin 1-2-3) ?

Q6010 - Drain (pin 8-7-6-5) ?

Q6011 - Drain (pin 8-7-6-5) ?

2) Remove all power.

Meter in resistance mode.

Check & post the resistance for the following:

Q6010

Source & Drain
Source & GATE
GATE & Drain

Repeat the measurements for:

Q6011, Q6000, Q6001

On the topic of resistance measurements, be sure to review the following excellent webpage - see resistance chart:

http://electronicsbeliever.com/how-t...-is-defective/

Q6010 Q6011
D 19 D 19
G 6 G 19
S 19 S 25

I'M sure that problem isnt in 19v line, any other idea?

[maurovalero]

Re: 6050A2560201-MB-A03 Won't turn on.

i hope your help

[mon2]

Re: 6050A2560201-MB-A03 Won't turn on.

These readings do not look correct:

Q6010 Q6011
D 19 D 19
G 6 G 19
S 19 S 25

Can you double check the values and post them again?

The drain voltage of Q6010 should be the same at source of Q6011.

Also interested in the voltages on Q6012, Q6000, Q6001.

Then remove all power and share the resistance of each mosfet.

Source & Drain
Source & gate
Gate & Drain

[maurovalero]

Re: 6050A2560201-MB-A03 Won't turn on.

These readings do not look correct:

Q6010 Q6011
D 19 D 19
G 6 G 19
S 19 S 25

Can you double check the values and post them again?

The drain voltage of Q6010 should be the same at source of Q6011.

Also interested in the voltages on Q6012, Q6000, Q6001.

Then remove all power and share the resistance of each mosfet.

Source & Drain
Source & gate
Gate & Drain

add picture with medicion, i found a coil near to pad6015, but is open, the problem is in 1 side have 19v and other gnd with 0.002om.