What is Cold testing method
When riding on the tips of the
component installed in the mobile pcb, without giving voltage to the mobile
phone and checking it, it is called cold testing.
In this testing, when testing the
tips from the black probe by placing the red prob of the multimeter on the
ground of pcb, you get a value, that value can be different on the tips of each
section. The value and its name in all the sections are written below, if it is
more or less than that, then there is a fault in that section of the mobile.
This value is not fixed but will be 50 + - then let's assume bad
Ø Ear
Phone Connector Tip (+ , -): .300 to .1500
Ø Loud
Speaker / Ringer Connector Tip (+,-): . 300 to .1500
Ø Battery
Connector Tip (+): .250 to .600
Ø Battery
Connector Tip (Sense): above .500
Ø Display
Connector Supply Pins: .250 to .800
Ø Display
Connector Signal Pins: .250to .800
Ø Camera
Connector Supply Pins: .250 to .800
Ø Camera
Connector Signal Pins: .250 to .800
Ø Key
Tip (Row and Column): .250 to .800
Ø Charger
Connector Tip(Vcharge): .250 to .800
Ø Charger
Connector ( DP/DN):.250 to .800
Ø Vibrator
Motor Connector: .250 to .800
Ø Power
ON / OFF Switch Point (+): .500 to .1800
Ø MIC
Connector Tip (Analog MIC) (+,-): .250 to .1800
Ø SIM
Card Connector Pin 1 (VSim): .250 to .700
Ø SIM
Card Connector Pin 2,3,6: .250 to .800
Ø SIM
Card Connector Pin 4 (GND): .00 (Beep)
Ø Micro
SD Card Connector Pin 4: .250 to .600
Ø Micro
Card Connector Pin 6 (GND): .00 (Beep)
Ø Micro
Card Connector Pin 1,2,3,5,7,8: .250 to .800
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