Checking The Reset Port; Checking The Focus & Tracking Servo - LG DVD6054 Service Manual

11. Checking the reset port

Pin 81 of IC202, pin 124, 186 of IC501 and pin 12 of IC503 are related to RESET.
We can know whether IC is intialized or not through those ports.
The waveform shows the status when the reset signal works normally.
If the /M-RESET is abnormal, then check the front u-com(IC901) and replace it
12. Checking the focus & tracking servo
Waveforms as below are regarding focusing and tracking servo normally.
FE and TE signal are generated in IC202 and output at pin55, pin54 of IC202,(TP212, TP211)
respectively.
FE
IC202 Pin55
(TP212)
TE(TP211)
IC202 Pin54
The waveform when power on
3-7
/M-RESET (Pin124 of IC501)
DSP_RST (Pin 81 of IC202)
3.3V power input