Huawei Device PT Test Instructions презентация

Course objectives
After learning this course, you can:
What is PT, Test items of PT test
PT station setup
PT test procedure
TOP failure trouble shooting

01
02
03
What is PT
PT Station Setup Diagram
PT Test procedure
PT test items and Logs Explanation
Trouble Shooting
04
05

01 What is PT
PT testing :
Monitoring power on current/idle current/leak 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

02 PT Station Setup Diagram
Mode 1:
Devices are located in the jig and connected with Jig via pogo pins

02 PT Station Setup Diagram
Mode 2:
Testing with fake battery. Devices are with external battery

02 PT Station Setup Diagram
Mode 3:
Testing with Jigbox

03 PT Test procedure
Setup the station
Launch the test tool and set 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

04 PT test items and Logs Explanation

05 Trouble Shooting
Normal process:
PASS
Fail
PASS
PASS
Fail
Fail

05 Trouble Shooting
Search the port fail:
PASS
Fail
PASS
Fail
Fail
PASS
PASS
Fail
Fail
Fail

05 Trouble Shooting
Idle Current fail:
PASS
Fail
Fail
Fail
PASS
PASS
Fail
Pass

05 Trouble Shooting
Idle current Trouble shooting:
Step 1: Power on the MLB 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

05 Trouble Shooting
Leak Current fail:
PASS
Fail
Fail
Fail
PASS
PASS
Fail
Pass

05 Trouble Shooting
Leak Current trouble shooting:
The best way to do FA 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

05 Trouble Shooting
Step2: if VBAT is leakage current. Feeding 4V to 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

05 Trouble Shooting
Charging fail:
PASS
Fail
Fail
Fail
PASS
PASS
YES
Fail
Pass
Fail
Fail