LG MC3283FMPG Service Manual page 31

No
7
Normal
Yes
Check the connection status of high-voltage capacitors and measure
the resistance with a multimeter as shown below
Terminal Resistance
Momentarily shows
Normal =
several ohms and then
gradually return to infinity
Abnormal= 0 Ohm
No
Normal
Yes
Check the connection status of high-voltage diode and measure the resistance
across the terminals with a clamp meter
Forward Resistance
Normal= Hundreds KOhm
Abnormal= Infinity
No
Normal
Yes
Unplug the Blue, White
housing connected across
the relays (RY1, RY2)
Connect the power cord
Press the Start button, and then check the
resistance across terminals of relay RY1 & RY2
Backward Resistance
Normal= Infinity
Abnormal= 0 Ohm
Abnormal Normal
-27-
Filament & Case Resistance
Normal= Infinity
Replace the high
voltage diode
No
Normal
Yes
Replace
Harness
Replace the high
voltage fuse
Replace the high
voltage capacitor
Replace PCB