Probleme No Power on HP ProBook 650 G1

[moateez]

hello Friend ihave laptop with no power

i loock for a shematic :6050A2566301-MB-A04 15


i found transistor ho is burned his number on matherboard is Q4900 end there's a short on his Pins

[moateez]

Re: Probleme No Power on HP ProBook 650 G1

The trasistor is like this

writing on him 6c3 like picteur

[SMDFlea]

Re: Probleme No Power on HP ProBook 650 G1

It could be a BC817 − 40LT1

https://cdn.badcaps-static.com/pdfs/...d1aa2a100c.pdf

[moateez]

Re: Probleme No Power on HP ProBook 650 G1

Thnks sir i will replace him
But i nedd schematic for the mother board to chek first eny other problème

[moateez]

Re: Probleme No Power on HP ProBook 650 G1

hello friends please schematic

[SMDFlea]

Re: Probleme No Power on HP ProBook 650 G1

hello friends please schematic

Its not available .

[moateez]

Re: Probleme No Power on HP ProBook 650 G1

sir this transistor BC817 − 40LT1 are the same with my transistor

[SMDFlea]

Re: Probleme No Power on HP ProBook 650 G1

I think its the right one.Read the datasheet.Page 1 , 6x = Device Code , x = A, B, or C .The DOT is lead-free

6C, month 3 ,lead-free .(Note: Microdot may be in either location)

*Date Code orientation and/or overbar may vary depending upon manufacturing location.

The orientation means that the date code can be either vertical or horizontal .


http://www.s-manuals.com/smd/6c

[moateez]

Re: Probleme No Power on HP ProBook 650 G1

the bios ic also is burned on

[sahamipoor]

Re: Probleme No Power on HP ProBook 650 G1

the bios ic also is burned on

hi..
do you find that smd 6c?
i need to know it number too..let me know plz

[mon2]

Yes, see above starting from post #3.

[sahamipoor]

Yes, see above starting from post #3.

I searched a lot about this regard..
This piece cannot be BC817!!! , because 19 volts or VBAT is connected to its (base )OR PIN 1, and if this transistor is placed and the base is connected to 19, in pin 2 or Emitter of it will definitely damage the i/o chip.

[sahamipoor]

that is lins in board...pin 3 go to EC pin 97 also to pin 1 w25q128

[mon2]

Post more clear pics of this area to review the case again.

[sahamipoor]

Post more clear pics of this area to review the case again.

i am sure about The communication path of this piece

[mon2]

Follow this investigation:

1) go here:

ProBook 650-G1 płyta 6050A2566302-MB-A04- prośba o identyfikację elementów • Forum ELVIKOM

2) zoom in on the shared picture and you will see a close by SOT-23 device @ Q3003. Looks to be the same as the above mystery part. Would you agree?






3) For this logic board, found a schematic in my database.

Q3003 on the above HP board is a 2N7002 mosfet.

[sahamipoor]

Follow this investigation...

Thank you for your search..
In this case, even if it is a MOSFET, 2n7002 still cannot work like this. Of course, with my experience, because the voltage of 19 volts causes damage.
In the same case, I replaced this part with a transistor and the ec-pch chips became defective!
Because in this case, the gate pin must be connected to 19 without resistance and switch between pins 2 and 3.

[sahamipoor]

In this case, I will use your suggestion again and let you know

[sahamipoor]

In this motherboard (HP Probook 650 G1 6050A2566301-MB-04):
3.3 /5 v there are ok .. but with so many different bios, the motherboard does not turn on!!! and the RSMRST# pin does not activate!!!
I don't have PM_PWROK and sys_work.
rtc and LID_SW# are good..
this transistor connected to pin 1 25q128 ic and /CS pin... and always is low abow 0.7v!! Should it be like this? This IC is always in writing mode with this voltage
i am confused

[mon2]

For safety, leave the 19v out of the equation. In the end, the mosfet is acting like a switch. Bridge the source & drain pins to force the 'switch to be closed'. Do not solder in a part at this location at all.