LG MG120a Service Manual page 46

4. TROUBLE SHOOTING
(4) Checking PAM Control Signal
TEST POINT
R113 (PAM_EN)
U102
R105(TX_RAMP)
Figure 9
WAVEFORM
CHECKING FLOW
Check TX_RAMP and PA_EN Check TX_RAMP and PA_EN
Check if there is Check if there is
Any Major Difference or not Any Major Difference or not
¨ Refer to Graph 6 ¨
CIRCUIT
TX_RAMP
PAM_EN
Graph 6
No No No
Similar? Similar? Similar?
Yes Yes Yes
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