820-2915-B Not power on

tipoti

Member
Device won't turn on when battery is plugged in .orange light is on when i plug in the charger the fans spin and then stop
current drawn 0.35a-0.45a
 

2informaticos

Administrator
Staff member
Please post as more information as needed.
Do you mean the machine turns on and runs correctly with charger alone (no battery)?

Check Q7030 and Q7055.
Post F7040 voltage w/ and w/ battery connected.
 

tipoti

Member
I have another 820-2850 motherboard - image was coming but there was squareness , i removed the video card, this motherboard does the same thing the fan spins and stops.
 

2informaticos

Administrator
Staff member
"i removed the video card"
What this means?

The GPU is soldered on the MLB, there is no video card.
It can be disabled, as already posted on the forum.
Did you change C9560 before?

"Post F7040 voltage w/ and w/ battery connected."
If you've posted ONE voltage only, does this mean is the same in both cases???
 

tipoti

Member
step bay step 820-2915-B fans spin and then stop

battery installed

Q7030 =
pin5 =16.66 volt
pin 1,2,3 =12.13 volt - pin 4 =15 volt

battery not installed

Q7030 =
pin5 =16.66 volt
pin 1,2,3 =12.13 volt - pin 4 =12,94 volt

c9560 i didn't change f7040 = 12,13 volt same in both cases (battery not installed,battery installed )
 

2informaticos

Administrator
Staff member
I really don't understand why do you insist to post Q7030 all pins voltage.
I asked about ONE voltage point (F7040).
If you like to waste time, is your choice.

So you get incorrect PPBUS_G3H voltage, 12.13V; no matters battery is connected, or not.
That means bad communication between SMC and U7000.
Did you disconnect BIL?

Post voltage and diode mode to ground at SCL/SDA lines of battery bus.
 

tipoti

Member
you said measure the scl/sda line in diode mode, so I didn't measure voltage.

SDA = 3,474 Voltage and 3,0 voltage not fixed
SCL = 3,474 Voltage and 3,0 voltage not fixed

there are no sockets connected to the motherboard
 

2informaticos

Administrator
Staff member
"Post voltage and diode mode..."

With charger alone, the board turns on and restarts in few seconds?
Be aware, this board requires 85W charger to start (without battery).

SMC_RESET_L steady high?
Did you try SMC bypass ?
 

tipoti

Member
Sorry for the wrong and incomplete reading.
original 85 watt adapter yes
SMC_RESET_L = 3.482 Voltage still

Did you try SMC bypass ? how can I do that
 

tipoti

Member
i tried SMC bypass but the fan is not spinning and not power on, when i leave bypass , the fan keeps turning and stopping , it keeps doing the same thing it turns and stops
 

2informaticos

Administrator
Staff member
In SMC bypass should do same at least; just fan spins loudly.

SCL/SDA readings look good.
Try first changing U7000.
If still incorrect PPBUS_G3H, then need to change SMC.
Be sure first, R7000 is good.
 

tipoti

Member
hi,
u7000 change it
r7000 is good
F7040 = 12, 57 Voltage how many volts should there be ? 12.8 voltage Isn't it normal

fan spins and stops.
 

tipoti

Member
sabit = fixed
board view is wrong i guess, ,i dont understand
Q7820
 

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