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Confidential
Troubleshooting
Display Problem
Step
Check point
Result value
Defect point
1
Confirm the defect symptom
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2
Check the AMOLED connector (HDC7002)
Broken, dust, corrosion
AMOLED connector
(HDC7002)
Loose fitting
Connection
Normal
Go to the next step
3
Replace the AMOLED
Solved
AMOLED
Not solved
Go to the next step
4
Connect a AMOLED, and display on with a
power supply
(power supply voltage : 4.0V)
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5
Check the voltage of C7013 = 3.0V
Notice. It should be measured when the display is
activated on
If not the correct value
PMIC(U5004)
C7013=3.0V
Go to the next step
6
Check the voltage of C7015 = 1.5V
Notice. It should be measured when the display is
activated on
If not the correct value
U5004
C7015=1.5V
Go to the next step
7
Check the voltage of following chips
(C7012,C7026,C7049)
Notice. It should be measured when the display
is activated on
If not the correct value
U7001
C7012 = 7.0V
C7026 = -1.4 ~ -4.4V
C7049 = 4.6V
MAIN CHIP
