LG CT12 NR2 - DC Link Detection Circuit

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Only for training and service purposes
LGE Internal Use Only
4. Trouble Shooting
1VSQPTF
(FOFSBUJPOPGBOFSSPSDBVTFECZ%$
MJOLWPMUBHFEFUFDUJPOFSSPS
*UFNTGPSDIFDLJOH
$IFDLJOH%$MJOLWPMUBHFEFUFDUJPOFSSPS
4FUUIFUFTUFSJO%$7PMUBHF.PEFBOEDIFDLUIFDVSSFOU
$IFDLJOHUIFWPMUBHFCFUXFFO%$-BOE.JDPN@(/%
5IFTUBOEBSEPGOPSNBMWPMUBHFNFBTVSFNFOUJT_7
*GUIFNFBTVSFNFOUJTEJGGFSFOUGSPNUIFTUBOEBSESFQMBDF1$#"
$BVUJPO8IFOUIFNFBTVSFNFOUJTNBEFJOUIFTUBUFUIBUUIFFMFDUSJDJUZJTBQQMJFEDIFDLUIFUFTUFS
GPSCFJOHJOUIFNFBTVSFNFOUNPEFBOECFDBSFGVMUPBWPJEQPTTJCMFTIPSUPGUIFQBSUTPUIFS
UIBOUIFNFBTVSJOHQBSU
Apply the electricity.
Turn indoor devices off.
Measure voltage.
Replace PCBA.
Current detection
part is normal.
$IFDLJOHNFUIPE
Within 2.3~2.7V
Ⲽ1$#"1$#"TTFNCMZ
:F T / P
%$-JOL%FUFDUJPO$JSDVJU
6.7 Troubleshooting Outdoor Error
CH 21 (DC Peak / Comp IPM Fault)