LG S33A1-D Service Manual

3-8
RECEIVER BAR TROUBLESHOOTING
1-2. SYSTEM PART
Power On
Check IC801 and SMPS.
Check D804, IC802
& SMPS.
Replace X100.
Check CN303.
Replace IC301 (FLD Driver).
“WELCOME”
Display on FLD
OK?
IC101
3 V_MICOM, 3.3 V
OK?
3V_MICOM,
FL(+), FL(-)
OK?
X101
20.000 MHz
OK?
3401_RX,
3401_CLK, 3401_STB
OK?
IC301
Data Output to VFD
OK?
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
Replace
IC100 UPD78F1165.
Check VFD.
YES
MAIN board
FRONT board

LG S33A1-D Specifications

General

Brand	LG
Model	S33A1-D
Category	Speaker System
Language	English