Trouble Shooting Guide; Power Board - LG RU-50PZ61 Service Manual

1. Power Board

1-1. General Power Flow
Start check
Doesn't the
screen whole come
out?
No
Doesn't the
low pressure output
come out?
No
Doesn't the
high tension output
come out?
No
High tension
Yes
output voltage Drop
it occurs?
No
Manufacture enterprise
meaning of a passage

TROUBLE SHOOTING GUIDE

Yes It is identical
with Power Off
condition?
Yes
1. Check the Power Off
condition.
Doesn't the
Yes
St-by 5V signal
come out?
Yes
3. Check the St-by 5V
signal circuit.
Doesn't the
Yes
VSC signal Vs-ON
come out?
Yes
7. Check the VSC Vs-ON
signal
When remove
the Y, Z B/D Module
Input Connector, Power
Board high tension output
voltage Drop
it occurs?
Yes
9. Check the Power
Board Output high
tension circuit
No
Is the Interface
signal operated?
Yes
2. Check the Interface
signal condition.
Doesn't the
No
5V Monitor signal
come out?
Yes
4. Check the 5V Monitor
signal circuit.
Doesn't the
No
Vs, Va voltage output
come out?
Yes
8. Check the Vs, Va
voltage output circuit.
When
remove the
No
Y B/D Module
Input Connector, output
voltage Drop
it occurs?
Yes
10. Check the Z B/D
Module Coutput circuit
- 13 -
Doesn't the
No
VSC signal RL-ON
come out?
Yes
5. Check the VSC RL-ON
signal.
Doesn't the
VSC low pressure
output come out?
Yes
6. Check the VSC low
pressure output
When
remove the
No
Z B/D Module
Input Connector, output
voltage Drop
it occurs?
Yes
11. Check the Y B/D
Module Coutput circuit
No