Touch Problem - Samsung Galaxy Grand 2 Repair Manual

Touch problem

Step
1 Confirm the defect symptom
2 Check the LCD connector (HDC600)
3 Check the TSP connector on LCD module.
4 Replace the TSP
Connect a LCD and display on with a power
5
supply (power supply voltage : 3.8V)
Check the voltage of following chips
(C604,C433)
6
Notice. It should be measured when the
display is activated on
Check the Signal of following chips
(R601,R602)
7
Notice. It should be measured when the
display is activated on
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Check point Result value
-
Broken, dust, corrosion
Normal
Broken, dust, corrosion
Normal
Solved
Not solved
-
If not the correct value
C604 = 2.8V
C433 = 1.8V
If not the correct value
Same signal compared with a
good PBA
Defect point
-
LCD connector
(HDC600)
Go to the next step
TSP connector
Go to the next step
TSP
Go to the next step
-
C604-> LDO(U605)
C433 -> PMIC(U401)
Go to the next step
R601,R602
MAIN CHIP or PBA
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