TCL TRF-520WEXA+, Service Manual

Page: 27 / 32

Common faults of electrical installation
No. Fault phenomenon Cause of failure Handling method
1
The defroster heater
in chamber F fails
The terminal connector is poor Check all terminals to ensure their connections are reliable:
The heating pipe of defroster fails
Use a multimeter to measure the resistance at both ends of the
heating pipe, which shall be about 280 Ω under normal
conditions:
The fuse of defroster fails
Measure the two ends of the fuse of defroster with external
meter, and it shall be in on-state:
2
The grounding
resistance is
unqualified
The screws of grounding wire of
compressor are loose Check the grounding condition of compressor and tighten the
screws:
3
After connecting the
power supply, the
whole machine has
no power
The connector is loose
According to the physical wiring diagram, check the
connection of the corresponding connection terminals:
The master control board fails
Check the power input end of the master control board.
If the input is normal, replace the master control board:
4
Compressor does
not start
The terminal connection is poor
According to the actual wiring diagram, check whether the
signal line of frequency conversion board, input voltage,
output voltage, compressor terminal and thermal protector are
connected normally.
The master control board fails
Detect the output end of the frequency conversion signal of
the master control board through an oscilloscope. If there is no
output signal, replace the master control board:
Compressor fails
Under normal conditions, remove the connection triangle of
compressor, connect a new compressor and energize it, if it
starts normally, replace the compressor