A1398 820-3662-a not power

[tipoti]

There were holes on the u7100. I change it. Q7135 was short I changed it. It draws 0.08 amps right now. U7100 warming up

diode mode SDA: 0.528 / SCL : 0.532
CHGR_ACIN : 4.7 volt
PDCIN_G3H_CHGR : 20 volt
PPBUS_G3H : 0,9 volt

 

[tipoti]

PP3V42_G3H : 3.4 volt

 

[2informaticos]

What about diode mode on PPBUS_G3H?
Check resistance between pins 17/18 and 27/28 of U7100.
Also post more pins voltage; 1, 2, 9, 12, 13, 14, 15, 17, 19, 20, 27.

 

[tipoti]

PPBUS_G3H diode mode : 0.463

R7151/52 no problem
R7121/22 no problem

pin 1: 18.16 Volt
pin 2: 18.21 Volt
pin 9: 4 Volt
pin 12: 3.4 Volt
pin 13: 3.3 Volt
pin 14: 3.2 Volt
pin 15: 0.074 Volt
pin 17: 2.5 Volt
pin 19: 5 Volt
pin 20: 4.6 Volt
pin 27: 19.98 Volt

 

[2informaticos]

"pin 9: 4 Volt"
Are you sure about this?
In such case, there is a problem with R7121/22, or their traces.

"pin 1: 18.16 Volt
................
pin 27: 19.98 Volt"
Seems that Q7180 is bad.

"Check resistance between pins 17/18 and 27/28 of U7100"
Why don't reply correctly?

 

[tipoti]

Pin 9 : 4 volt sure

I uninstalled the Q7180 but still the U7100 gets hot. Then I put a new one, nothing changed.

17/18 : 3.7 ohm
27/28 : 21.5 ohm

pin 27: 19.98 Volt"

PPBUS_G3H L7130 : 2.3 volt

 

[2informaticos]

DCIN voltage can't pass through Q7180 (to R7120 and pin 27/U7100), if pin 1/U7100 is high; must be low, to drive Q7180 correctly.

AMON (pin 9/U7100) shows overcurrent through R7120.
Did you check resistance exactly between U7100 pins 17/18?
You may have a broken trace; not good to check just over C7120 in this case.
Be sure to have good solders.
If all good, then U7100 is bad too (apart of Q7180).

You should change Q7130 too; maybe even Q7135.

 

[tipoti]

I removed f7140/41. I disassembled the q7130/35. I changed the u7000 4 times. But again the u7000 is getting hot. It draws 0.08 amps. Currently there is no f7140/41 q7130/35 on the motherboard but it keeps getting hot

 

[2informaticos]

Wait, do you really talk about U7000, or U7100?

 

[tipoti]

Sorry U7100

 

[2informaticos]

Remove U7100 and check resistance between pads 17/18 and 27/28.
Also check between pads 19/20.

Be sure all surrounding resistors are good.
Then resolder U7100 and Q7130/35.
Keep F7140/1 out and check again U7100 voltages.

Don't forget to change Q7180.

 

[tipoti]

17/18 pin between : 4.1 ohm
27/28 pin between : 22 ohm
19/20 pin between : 5.5 ohm

Keep F7140/1 out

pim 1: Voltaj yok
pim 2: 18.26
pim 9: 0,040 Volt
pim 12: 3,4 Volt
pim 13: 3,3 Volt
pim 14: 3,2 Volt
pim 15: 0,074 Volt
pim 17: 7,7 Volt
pim 19: 5 Volt
pim 20: 4,6 Volt
pim 23: 7 Volt
pim 26: 19,98 Volt
pim 27: 19,98 Volt

Q7180 I wrote that I changed it before. Nothing changed. u7100 still getting hot

 

[2informaticos]

"pim 1: Voltaj yok"
???

Check pin 3 too; sorry that I forgot to mention above.

 

[tipoti]

pin1: No voltage
pin3 : 4.7 Volt

 

[tipoti]

I removed all the ones with x to the top. But u7110 keeps getting hot

 

[2informaticos]

Removing good components will not help you.
Put all back; just be sure to be good.
Check any trace and solder.
Then post again U7100 voltages, above mentioned.
Change all capacitors surrounding U7100, if not sure about them.
Also change U7100, if still overheats.

Just keep out F7140/1.

 

[tipoti]

U7100 getting hot with R7101 in place. It draws 0.08 amps. R7101 draws 0.01 amps without

 

[2informaticos]

Did you resolder all?

Check/change all components related with pins 21-28.