LG HT552TH Service Manual page 33

C
Check the RF connection
between IP9009 and ES8381.
Collector
voltage of power
transistor is OK?
(Q405, Q406)
Proper
RF signal on ES8381
Proper
SPINDLE signal on
ES8381
SPNP
SPNN output
properly?
3-6
Check the laser power circuit on
ES8381 and connecting to
power transistor.(Q405, Q406)
Check the related circuit on
ES8381 RF signal.
ES8381.