Vkk Check; Electrical Troubleshooting Guide - LG LM-M540 Service Manual

❏ ELECTRICAL TROUBLESHOOTING GUIDE
I AUDIO PART
P-SENS PART CHECK
ZD 901(5V) Voltage check
IC301 26PIN PATTERN Check

VKK CHECK

CN302 28pin DC -33V check
IC301 51PIN check
C916 -33V and less check
Q903 replacement
Half-wave rectification wave form check
R783 check, then ZD901 replacement
ZD902 -33V check
Q903 turn on check
Pattern disconnection check
D912, D911 replacement
normal
- 2-2 -
D713 Replacement
ZD902 replacement
Refer to power
supply check