LG AMNW07GDBL1 Service Manual page 67

Part 5. Trouble Shooting
Display
Title
code
AC Input current / Comp
phase current sensing cir-
40
cuit - basic vlotage sens-
ing error
WARNING
Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state
of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
and installation condition
Input_I
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Only for training and service purposes
Cause of error
• PCB sensing circuit part
burned
Is AC input current
sensing part normal?
Is the Comp phase
Current sensor
part normal?
Yes
Recheck power
5V_GND 5V_GND 5V_GND
Check point & Normal condition
• Check power input connector, Comp output
current sensing circuit
• Check voltage measurement
on the input current (Fig.1)
at the power-on standby
state DC 0V ± 0.2V
• Remedy : remove cause of error
• DC voltage measurement
at the measurement point in
figure 2 at power-on
standby state -> measured
value : within 2.5V ± 0.2V
• Remedy : remove cause of error
Comp_Current
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5V_GND 5V_GND 5V_GND
LGE Internal Use Only