ATF eMMC Test Point Finder Tutorial How To Work

STEP 4 : How to find Vcc



<<< FOR QUALCOMM BASED PHONES, YOU DO NOT NEED VccQ and VCC >>>

<<< You just need to Connect USB Cable to Phone PCB >>>

<<< Proceed to STEP 5 on How to find DATA Test Point >>>

DO NOT USE TP CABLE FROM STEP 1 for finding VCC.

Finding VCC Requires another TP Cable which you can make using your current

External Power Adapter for eMMC.

You need to Prepare your External Power Adapter with a TEST POINT PIN on 3.30v Like This:

http://174.120.45.27/tmp/EMMC_VCC_FINDER_SCHEMATICS.jpg







1. Solder CLK Test Point Found from STEP 2 into the Phone PCB

2. Solder CMD Test Point Found from STEP 2 into the Phone PCB

3. Solder VccQ External Power 1.80v~2.80v from STEP 3 into the Phone PCB

4. Solder GROUND Connection from ATF RJ-45 to the Phone PCB.

5. Solder GROUND Connection from External Power Adapter to the Phone PCB.



http://174.120.45.27/tmp/EMMC_VCC_FI...ONNECTIONS.jpg





On ATF Software, Make the necessary Settings for eMMC Finder Loop:



http://174.120.45.27/tmp/TP_FINDER_VCC_SETTINGS.png





In this Example, I tried all the Locations that were marked with RED

DO NOT TRY TO TP a RESISTOR, it is NEVER CORRECT for VCC

Capacitors are BROWN in COLOR

Resistors are BLACK in COLOR

ONLY TRY TO TP Capacitors

http://174.120.45.27/tmp/eMMC_Finder_VCC.gif





When you have connected the testpoint cable to the correct Vcc Test Point, the ATF Software will announce to you

that the VCC Pinout has been located.