Read LG WF-D55WSA / WF-D60WSA Service Manual online
2) Display problem
Where, what and how
Check results
Possible reasons
Solution measures
Main voltage
1. measure main voltage
Less than 85% of normal
voltage
Low voltage
Because of low voltage
supply.
Please
use
transformer if voltage is
keeping low.
2. measure external insert
row voltage if main
voltage is normal.
Less than 85% of normal
voltage
Wire is too small or there
are
too
many
connections on insert
row.
Use transformer
PC board
1. LED damage
2. LED drive circuit
damage
3. Chips damage
PC board damage
Replace PC board
3) Restart during working
Where, what and how
Check results
Possible reasons
Solution measures
Main voltage
1. measure plug voltage
during working
Less than 80% of normal
voltage
Main voltage is too low or
wire size is too small.
Because of low voltage
supply and please use
suitable wire.
2. restart fault repeats
during special periods
Temporary voltage surge
Because of environmental
condition(high-frequenc
y voltage around)
3. check if there is voltage
change.(such as flashing
lights)
Because of power supply
environment
PC board
Replace PC board
1. It must be PC board
fault if there is no
main voltage fault.
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