LG CT09F Service Manual page 82

6.7 Troubleshooting Outdoor Error
CH 21 (DC Peak / Comp IPM Fault)
Compressor Phase Current Detection Circuit
Judgment of the IPM part fault of
Purpose
PCB assembly.
1. Set the tester in DC Voltage Mode and check the Voltage.
2. Measure the voltage of phase current detection signal – Micom GND.
3. The standard of normal voltage measurement is 2.5 V ±0.2 V.
4. If the measurement is different from the standard, replace PCBA.
Current detection
part is normal.
! Caution : When the measurement is made in the state that the electricity is applied, check the tester
for being in the measurement mode and be careful to avoid possible short of the parts other
than the measuring part.
Items for checking 1. Checking for current detection error.
Checking method
Apply the electricity.
Turn indoor devices off.
Measure voltage.
Within 2.3 ~2.7V
Yes
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Part 4 Trouble Shooting
❈ Point each PCBA
: refer to the next page
No
Replace PCBA.
❈ PCBA : PCB Assembly
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