Trouble Diagnosis; Troubleshooting - LG LSC27990TT Service Manual

TROUBLE DIAGNOSIS
1. Troubleshooting
CLAIMS. HOW TO CHECK
1. Faulty start
CAUSES AND CHECK POINTS.
1) No power at outlet.
2) No power on cord.
Bad connection between plug and adapter (faulty plug).
_The distance between pins.
LPin outer diameter.
power cord.
Internal e lectrical s hort.
Faultyterminal c ontact.
3) Shorted start circuit.
No poweron Disconnected copperwire. F Powercordisdisconnected.
L Faultysoldering.
Loosecontact.
- Largedistancebetween
maleterminal.
- Thinfemaleterminal.
Terminal d isconnected.
Badsleeveassembly.
Disconnected. F Weakconnection.
Shortinsertedcordlength.
• Wornout toolblade.
OLP isoff.
Capacity of OLP is small.
Characteristics of OLP is bad.
Badconnection.
Poweris
disconnected.
InnerNi-Crwireblowsout.
Badinternal c onnection.
Faultyterminal c aulking(Cuwireis cut).
Badsoldering.
No electricpower on compressor.- Faultycompressor.
Faulty PTC. Powerdoesnot conduct. - Damage.
Badcharacteristics.- Initialresistance is high.
Badconnection with FTcoloose.
compressor. LAssemblyis notpossible.
Badterminal c onnection.
4) During defrost. F Start automatic defrost.
L
Cycle was set at defrost when the refrigerator
was produced.
* Measuring instrument:
Multi tester
• Check the voltage.
If the voltage is within +15%
of the rated voltage, it is OK.
• Check the terminal
movement.
• Check both terminals of
power cord.
Power conducts: OK.
No power conducts: NG
• Check both terminals of
OLP
If power conducts: OK.
If not: NG.
• Check the resistance of both
terminals.
At normal temperature 6:
OK.
If disconnected: _.
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