820-3787-A A1398 not charging

[tipoti]

hello,

U7100 was getting hot. I replaced it. The device turns on, but there is an interesting situation. It draws too much amperage. For example, if I give it 4 amps, it uses 4 amps. If I give it 6 amps, it uses 6 amps and it shows like a short circuit. I think the q7130-35 before me was replaced

 

[tipoti]

SCL 529
SDA :525

 

[2informaticos]

I'm not sure what you mean with "i give it amps".
The current consumption is decided by the MLB itself.
You can only set PSU amp limit to max and 18.5V output voltage.

Don't you have original (85W) charger for test?

 

[tipoti]

I know what you mean. I know that the device decides how much current it will draw. But there is a problem with this device. The power supply output is set to max 7 amps, actually I don't touch it at all. When I plug the same battery into a working device, it draws 3.20 amps. When I plug it into this device, it draws 5 amps and rises up to 6 amps.

 

[2informaticos]

So machine turns on.
Does it also work normally?
Is the battery charging at least?

 

[tipoti]

The device turns on, but it is not normal for it to draw 6-7 amps. It doesn't charge, on the contrary, it dies. It dropped by 5% in 1 minute.

 

[tipoti]

Now the orange light is on, the device is turning on but it is not drawing any amperage, 0 ampere.

 

[2informaticos]

What is actual PPBUS_G3H voltage?
Do you get 3V3_S5/SUS?

Check resistance (ohm scale) between pins 17/18 and 27/28 of U7100.
Also test if turns on in SMC bypass mode.

 

[tipoti]

PPBUS_G3H : 10 volt
U7100'ün 17/18 : 140 ohm 27/28 : 0,541 mega ohm

The device still turns on and does not charge. it doesn't draw any amperage

 

[tipoti]

r7121-22, r7151-52 were defective, I replaced them. Also, c7374 had liquid damage and I removed it. It is currently drawing a stable 3.20 amps and charging. I'm testing it now, thanks