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MX8550
Check if there is any major difference referring
To Figure 4.2.2.6. Is it similar?
whether it is higher than 3.4V.
Check pin7 at U107(PA_R1 signal)
whether it is higher than 2.2V.
Check pin3 at U107(PA_R1 signal)
whether it is lower than 2.2V.
RF_IN fed up with CW signal
in low gain mode of PAM
LG Electronics Inc.
Checking Flow
Checking Flow
Start
Check pin6, 8 at U107
YES
Check pin4, 12 at U107(Vcc)
YES
YES
YES
Replace U107
Waveform
PAM circuit is OK. See next page
YES
NO
NO
NO
Waveform
Figure 4.2.2.6
Check Vcc line
Check PA_ON line
Check PA_R1 line
RF_OUT
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