Huawei Device PT Test Instructions презентация

of PT test
PT station setup
PT test procedure
TOP failure trouble shooting

Logs Explanation
Trouble Shooting

04

05

current of phone, changing the phone’s status(power on/sleep/power off) by commands via USB circuit , Programmable power supply(Keithley 2303/2306 or Agilent66311B/66319D) as power source.

There are three modes for PT testing, the details refers to PT instructions of each model
Mode 1: Testing with jig
Mode 2: Testing with fake battery
Mode 3: Testing with Jig box

and connected with Jig via pogo pins

with external battery

the parameters

Testing

Download the tool from“diagnose and test tool”, Operation Manual in in “Maintenance Document”

Initialization

Power on and search the port

Verify Manufacturing info

Power on current and voltage test

Idle current test

Leak current test

Charging test

END

PASS

Fail

Fail

Fail

Pass

by programmable power supply 1, and then sleep the MLB
Step 2: Feed voltage 0.2V higher than it which should be on when sleep, such as 1.8V, 0.9V, 3.3V, etc.
Step 3: Check the current of power supply 1, if the current changes , there are something wrong with the circuit

Pass

by using thermal infrared imager, if no thermal infrared imager, need try to compare voltage when feeding voltage to VPH(SYS) or VBAT
Step1: Making sure which trace is leaking current, VPH(SYS) or VBAT:
Remove power convert IC
Feed 4V to VPH and VBAT one by one by
programmable power source and digital
multimeter (accuracy: higher than 4 bit),
if the voltage becomes lower than
4V, there is leakage on the circuit.

Kethley 2303

Fluke multimetter

GND

negative

negative

VPH

VBAT

Rn

Rx

positive

positive

VBAT by positive, and measure input of Un(can be IC , resister, capacitor, etc, R is resistance of PCB line) by negative
If U3 is bad and leakage current, V3(Vpositive-Vnegative) will be the biggest one.

Kethley 2303

Fluke multimetter

positive

negative

U1

U2

U4

Un

VBAT

GND

U3

negative

positive

Pass

Fail

Fail