Troubleshooting; Audio Part - LG FFH-M217X Service Manual

❏ TROUBLESHOOTING

• AUDIO PART

P-SENS PART
Does +5V appear at ZD901?
YES
Check the pattern of
IC301 pin .
26
VKK PART
Does DC - 33V appear at
PN301 pin .
19
NO
YES
Check the pattern of FRONT
PCB ASS'Y
Check the waveform
NO
of D937 (+).
YES
Replace ZD901.
Check the DC -35V of C928(-)
YES
Check the DC -33V of
ZD 902(-)
YES
Check the DC -33V of
Q901 "E"
YES
Check the PATTERN
- 2-2 -
NO
Replace the D937
NO
Replace the D936
NO
Replace the ZD902
NO
Replace the Q901