LG H990ds - DC;DC Block Voltage Check

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3. TROUBLE SHOOTING
Checking DC/DC Block
3.3 DC/DC Block
START
Check next step
Check
TP1(+VPA0)
0.5V ≤ TP1 ≤ 4.2V ?
Check U1601
Physical Damage or
soldering condition
NO
YES
TOP
U1601
TP1(+VPA0)
TP1(+VPA0)
U1601
(DC/DC)
Image Checking Flow
Circuit Diagram
16