LG NP5550B - Key; Led

3-8
ELECTRICAL TROUBLESHOOTING GUIDE
3. KEY/ LED
KEY/ LED
Check power DSP. (replace IC903)
OK
Check power DSP. (replace IC500)
Is input voltage 3.3 VA? (FB901)
Is control high?
(KEY: pin4, 6, 14, 15 of CN200)
(LED: pin8, 10, 12, 16, 18 of CN200)
NO
NO
YES
YES