820-00923 question folder

[geo8610]

hello this board does not recognize hard drive in disk utility, this measures


PP0V9_SSD_FIXED=0v
PP0V9_SSD_REG=0v
PP1V8_SSD_COLD : 0v
PP1V2_SSD_HOT: 0v
PP1V8_SSD_HOT=0v
PP3V3_S5_SSD=3.3V
PPVIN_2V7NAND_LB=13.1

there is no short in any coil
J9600 good continuity

 

[2informaticos]

"J9600 good continuity"
But you didn't mention any signal there.
Are you sure all are good?

Check U9400 pins 15, 19, 20 and L9400 voltage.

 

[geo8610]

What I measured was this continuity in this connector if it was bad, but I have not measured any signal.I measure any signal?
pin 15=0v
pin 19=5v
pin 20=5
l9400=0v

 

[2informaticos]

You must check continuity left/right, with the metal plate fixed on J9600.

 

[geo8610]

ok,check continuity in points left/right and they are fine, others are only cpu I could not check these points

 

[2informaticos]

Can you post signals voltage on J9600?
It must be connected, of course.
Use boardview and find points for all its lines.

 

[geo8610]

estos son algunos que pude medir, otros van solo a cpu, y hay otros que van a unos condensadores debajo de una tapa metalica u8600, esa tapa metalica se puede quitar facilmente?

Pin1= 5.1. pin2= 5.1
Pin 3= 1.78. pin 4= 1.78
Pin 5= 0v. Pin =6 0v
Pin 7=3.3 pin8=3.3v
Pin 11 3.3. pin 12=3.3
Pin 13=3.3v pin 14=3.3v
pin 17=0v
pin 19=0v
pin 35=3.3v. pin 36=3.3v
pin 37=3.3 pin 38=3.3v
pin39=3.3 pin 40=3.3
pin 41=3.3 pin 42=3.3
pin 43=13.1 pin 44=13.1
pin 54=3.3 pin 46=3.3

 

[2informaticos]

Signals look good.
I hope data lines have good conectivity too.

Compare diode mode readings to ground on the lines mentioned in first poost, with good board.

You may have problems with U9300, or some bad resistor on its area.

 

[geo8610]

I don't have a good board to check, I was checking resistors and r9350 on the board has a OL multimeter other times megaohms, and the voltage PICCOLO_IUVD=1.1v I don't know if it is a normal value.

 

[2informaticos]

R9350 is 1.3M resistor, should be good to check it out of board.

Don't need exact same board model.
Any of 00239/281/928 can help.

 

[geo8610]

I changed U9300, voltages appeared in all the coils, the equipment entered the system tested several times, I assembled the computer and started and came back with the same problem question folder and voltages no appear again in coils u9300

 

[2informaticos]

Bad solders maybe?

 

[geo8610]

you mean bad solders underneath u9300

 

[2informaticos]

If is the only thing you've resoldered...

 

[geo8610]

I did a u9300 reflow ensuring good soldering, I got u9300 coil voltages again, I assemble the equipment but when I connect the battery flex cable the equipment does not detect a hard disk, I remove the battery flex cable and if it detects a hard disk, it is possible

 

[2informaticos]

Try with known good battery...

 

[geo8610]

Is there any test for this reference similar to the ASD? What do you use?

 

[2informaticos]

Start in Diagnostic mode...

HOW TO collection

I hope this "How to" collection will help our members. I will possibly modify this post in time, if updates available. Trigger SMC_ONOFF_L (PMU_ONOFF_L): It reffers to simulate power button function, when the keyboard is not connected. We need to do this when we work with the board...

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