-
For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.Subscribe Now
U7000 CHGR_BGATE to Q7055 12v insteadof 5v
- Thread starter mdc2018
- Start date
Didn't think this could be the result because the battery is not proper recognized?
Why should U7000 enable Q7055, if doesn't see the battery???
Check resistance to ground on SCL/SDA lines of battery bus.
And, as general rule, tell us which board you have on the desk...
Why should U7000 enable Q7055, if doesn't see the battery???
Check resistance to ground on SCL/SDA lines of battery bus.
And, as general rule, tell us which board you have on the desk...
Yes Sorry I am still relatively new to board repair -
Board is 820-2936-A
Battery Bus Voltage while On / Plugged In
Pin 1 - 0V
Pin 2 - 0V
Pin 3 - 0V
Pin 4 - 3.4V
Pin 5 - 0V
Pin 6 - 3.4V
Pin 7 - 11.29V
Pin 8 - 11.29V
Pin 9 - 11.29V
Battery Bus Resistance to Ground (Battery Not Connected)
Pin 1 - 0.6
Pin 2 - 0.6
Pin 3 - 0.6
Pin 4 - 2.1
Pin 5 - 10
Pin 6 - 2.1
Pin 7 - OL
Pin 8 - OL
Pin 9 - OL
Battery Bus Resistance to Ground (Battery Connected)
Pin 1 - 0.2
Pin 2 - 0.2
Pin 3 - 0.2
Pin 4 - OL
Pin 5 - Jumps between 10 &18
Pin 6 - OL
Pin 7 - OL
Pin 8 - OL
Pin 9 - OL
Last edited:
Do NOT measure continuity (diode mode) on a powered board again!!!
That is completely useless...
I asked about SCL/SDA lines only; means pins 4 & 6 of J6950.
Diode mode should have 3 digits after 0...
Measure discnnecting everything from the board; leave only magsafe connected.
Post CHGR_A/BMON voltages, with both charger and battery connected.
Please, do NOT quote an entire post which is visible 5cm above...
That is completely useless...
I asked about SCL/SDA lines only; means pins 4 & 6 of J6950.
Diode mode should have 3 digits after 0...
Measure discnnecting everything from the board; leave only magsafe connected.
Post CHGR_A/BMON voltages, with both charger and battery connected.
Please, do NOT quote an entire post which is visible 5cm above...
Remove D6950 and measure again in diode mode.
Also check if battery is detected then.
Also check if battery is detected then.
Now remove ISL6259 and check again.
SMC will be the last...
SMC will be the last...
Strange that difference now.
There is only SMC remained.
Try first to reflow SMC with good flux; trying to eliminate any crap under SMC.
Hard reflow, SMC balls must melt, as measure points to bad solder on SDA line.
If doesn't help, change SMC...
There is only SMC remained.
Try first to reflow SMC with good flux; trying to eliminate any crap under SMC.
Hard reflow, SMC balls must melt, as measure points to bad solder on SDA line.
If doesn't help, change SMC...
Normal values change, depending what you have soldered on these lines.
If all components are present, should be aprox 400-450; equals on both lines.
Every time you remove something (for testing purpose), values increase; but should be equals...
If all components are present, should be aprox 400-450; equals on both lines.
Every time you remove something (for testing purpose), values increase; but should be equals...
Once you remove a component from that bus, doesn't resolder it yet, untill you get correct values.
Test every time you remove something.
If need to replace SMC, check the values after solder it; before resoldering anything else
Then resolder components one by one and check everytime the values.
Test every time you remove something.
If need to replace SMC, check the values after solder it; before resoldering anything else
Then resolder components one by one and check everytime the values.
Readings are different using different multimeters, even in the same board.
One multimeter will also show different values from board to board.
But in the same board, these two lines should show the same value, measured with the same multimeter.
Usual difference is smaller than 0.5-1%...
One multimeter will also show different values from board to board.
But in the same board, these two lines should show the same value, measured with the same multimeter.
Usual difference is smaller than 0.5-1%...