Troubleshooting - LG 32LC7D Service Manual

1. Power Board
1-1. The full flowchart for the voltage output
Start check
Does the whole
screen appear?
Yes
Does the
low pressure output
appear?
Yes
Does the
high tension output
appear?
Yes
Does the
high tension
output voltage
occur?
Yes
Manufacture's model
passage

TROUBLESHOOTING

Is it
No
identical to when the
power is off?
Yes
1. Check the Power Off
status.
Does the
No
St-by 5V signal
appear?
No
3. Check the St-by 5V
signal circuit.
Does the
No
VSC signal Vs-ON
appear?
No
7. Check the VSC Vs-ON
signal
When the
Y, Z B/D Module
No
input connector, does Power
Board high tension
output voltage drop?
Yes
9. Check the Power
Board Output high
tension circuit
No
Is the Interface
signal operating?
Yes
2. Check the Interface
signal status.
Does the
Yes
5V Monitor signal
appear?
No
4. Check the 5V Monitor
signal circuit.
Does the
Yes
Vs, Va voltage output
appear?
No
8. Check the Vs, Va
voltage output circuit.
When
No removing the Y B/D
Module input connector,
does output voltage
drop?
Yes
10. Check the Z B/D
Module output circuit
- 14 -
Does the
Yes
VSC signal RL-ON
appear?
No
5. Check the VSC RL-ON
signal.
Does the
VSC low pressure
output appear?
No
6. Check the VSC low
pressure output
When
removing the Z B/D
No
Module input connector,
does output voltage
drop?
Yes
11. Check the Y B/D
Module output circuit
Yes