iPad 3 Model A1430 fake charging

[LetItFlowTech]

What is the secret to adding jumper wires from pin 1 to Pin 5 on Q8104. I can not get my wires to stick. They keep falling off the pads. I have my soldering iron set at 780 degrees. What am I doing wrong?

[LetItFlowTech]

What is the secret to soldering jumper wires from pin 1 to Pin 5 on the Q8104 chip. I can not get my wires to stick. It keeps coming off the pads. I have my soldering iron set at 750 - 780 degrees. What am I doing wrong?

[LetItFlowTech]

I don't know why previous question posted several times. Anyways since I could not get my wires to stick I used a pair of thin insulated tweezers to short pin 1 to pin 5 on Q8104. Here is what I did and the results from test.

First I connected the RED test from multimeter to the + Battery tab and BLACK test from the multimeter to GND. Powered on logic board and carefully shorted pin 1 to pin 5 on Q8104 and got a reading of 4.94v at the + Battery tab. Does this test confirm that Q8104 is bad?

[jimchu316]

Originally Posted by LetItFlowTech

What is the secret to soldering jumper wires from pin 1 to Pin 5 on the Q8104 chip. I can not get my wires to stick. It keeps coming off the pads. I have my soldering iron set at 750 - 780 degrees. What am I doing wrong?

[jimchu316]

Q8104 pin 1 = 4.94v is no right, only 4.2V is okay.

please take 1 or more photos include: charger + cable + dock flex + logic board

Let us know how you are going to test it.

[jimchu316]

Originally Posted by LetItFlowTech

The jumber is right.


if Q8104 faulty, We have different way to repair it.

1, replace it, u need new Q8104 part (Level 3 / Component level repair)
2, remove it, jumbing pin1-2-3 to pin 5 (Level 3 / Component level repair)

Way 1 & 2 is General Way, no need many experiences of schematics

3, dont need remove the Q8104, only jumbing anyone way of PPVCC_MAIN to PPBATT_VCC , like before u do or C8165 to C8101 or Q8104 pin 1 to C8101. (Level 4 / PCB level repair)

Way 3 is higher level for repair, need many experiences and knowledge of schematics.


It is clear, using way 3 to fix which is faster, lower risk, easier.

[LetItFlowTech]

I will be uploading several pictures that you wanted to see



This is a 5v plug adapter



Flex connector and plug view



View of how I have the test leads in position to measure the voltage when I short Pin 1 to Pin 5 on Q8104.



Photo when logic board is live and measuring + Battery to GND, when I short pin 1 to pin 5 to Q8104.

[LetItFlowTech]

What would be causing 4.99 volt reading? Bad Q8104 chip. Did you see my resistance reading on the capacitors I took early in the post? Where those values within good range?

When I take Q8104 reading when nothing is shorted, I do get 3.74 volts across pins 1, 2 and 3 but nothing on the pin 5. So I shorted Pin 1 to Pin 5 on Q8104 and I do get reading, but its close to 5v and you say its took high. What else should I look at?

[jimchu316]

Originally Posted by LetItFlowTech

I will be uploading several pictures that you wanted to see



This is a 5v plug adapter



Flex connector and plug view



View of how I have the test leads in position to measure the voltage when I short Pin 1 to Pin 5 on Q8104.



Photo when logic board is live and measuring + Battery to GND, when I short pin 1 to pin 5 to Q8104.

check 1-7 key points again



1 / 5v -- > 2 / 5v -->3 / 5v -->4 /3.7-4.2v --> 5 / 3.7-4.2v --> 6 / 3.7-4.2v --> 7 / 3.7-4.2v --> battery

[LetItFlowTech]

Should I re-check points 1 through 7 with pin 1 shorted to pin 5 or just re-check the points just regularly without shorting any capacitors or shorting any pins on the Q8104 chip

[LetItFlowTech]

Hey JimChu316 I re-tested the key points again. No jumpers or shorts were performed during the test. Here are the results

TP1 - GND to L5757 = 5.06V
TP2 - GND to 8123 = Pins 1,2 & 3 = 5.06V, Pin 4 = 0V, Pin 5 = 5.06V
TP3 - GND to U8100 = could not access pins on U8100 chip.
TP4 - GND to L8112 = 3.76V
TP5 - GND to Q8104 = Pins 1,2 & 3 = 3.73V, Pin 4 =3.73V, Pin 5 = 0V
TP6 - GND to + BATTERY = 0V

[jimchu316]

Originally Posted by LetItFlowTech

Hey JimChu316 I re-tested the key points again. No jumpers or shorts were performed during the test. Here are the results

TP1 - GND to L5757 = 5.06V
TP2 - GND to 8123 = Pins 1,2 & 3 = 5.06V, Pin 4 = 0V, Pin 5 = 5.06V
TP3 - GND to U8100 = could not access pins on U8100 chip.
TP4 - GND to L8112 = 3.76V
TP5 - GND to Q8104 = Pins 1,2 & 3 = 3.73V, Pin 4 =3.73V, Pin 5 = 0V
TP6 - GND to + BATTERY = 0V

only the Q8104 faulty, jumbing it.


after jumbing, to test the battery, if <3.5V, using DC 3.5-4.0V charging battery.


and the 1A charger your using is not right, 1A charger only for iphone, iPad need 2A charger.

[LetItFlowTech]

So you want me to jump pin 1 to pin 5 on Q8104 again and take another measurement from GND to + BATTERY?

I will pull out the other charger which is 12W - 5V output 2.4A.

[jimchu316]

Originally Posted by LetItFlowTech

So you want me to jump pin 1 to pin 5 on Q8104 again and take another measurement from GND to + BATTERY?

I will pull out the other charger which is 12W - 5V output 2.4A.

Yes, I think so....................

[LetItFlowTech]

Ok re-ran my test morning using 12W , 5V, 2.4A power adapter.

Jumped pin 1 to pin 5 on Q8104 and took my voltage reading across +Battery to GND and got 4.89 to 4.90v reading at +Battery.

Does this sound like a failed Q8104 chip to you?