3-7
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Only for training and service purposes
LGE Internal Use Only
C
D
Audio feature verification.
Plug AV-Cable in
Plug headphone in
Line out
function normal?
Speaker out
normal?
1. Check mute
control signal.
2. Check U12 setting. Pin15-
Shutdown, Pin21-Volume,
Pin22-HP/LINE,
Pine23-SE/BTL
NO
Check 8202T
DAC out
NO
NO
NO
YES
YES
Check Audio
peripheral circuit
1. Check audio
relate circuit of
main chip.
2. Check Main chip.
Check
component value.
NO
YES
Check cable
YES
Headphone
out normal?
1. Check earphone
peripheral circuit.
2. Check U12 setting.
Pin22-HP/LINE,
Pine23-SE/BTL
NO
NO
YES
YES
Check Jack,
connector
Check open,
short, direction,
pin define.
NO
YES
YES
YES
