LG 42PM1M-UC (CHASSIS:RF-052C) Service Manual ▷ View online
- 13 -
TROUBLE SHOOTING GUIDE
1. Power Board
1-1. The whole flowchart which it follows in voltage output state
Start check
Manufacture enterprise
meaning of a passage
1. Check the Power Off
condition.
Doesn't the
screen whole come
out?
Is it identical
with Power Off
condition?
Yes
Yes
No
No
No
No
No
2. Check the Interface
signal condition.
Is the Interface
signal operated?
Yes
3. Check the St-by 5V
signal circuit.
Doesn't the
low pressure output
come out?
Doesn't the
St-by 5V signal
come out?
Yes
Yes
No
4. Check the 5V Monitor
signal circuit.
Doesn't the
5V Monitor signal
come out?
Yes
7. Check the VSC Vs-ON
signal
Doesn't the
high tension output
come out?
Doesn't the
VSC signal Vs-ON
come out?
Yes
Yes
Does
high tension
output voltage Drop
occur?
When the
Y B/D Module
input connector is
removed, does output
voltage drop
occur?
When the
Y, Z B/D Module
input connector is remove,
does Power Board hightension
output voltage Drop
occur?
Yes
No
No
9. Check the Power
Board Output high
tension circuit
Yes
10. Check the Z B/D
Module output circuit
Yes
When the
Z B/D Module
input connector is
removed, does output
voltage Drop
occurs?
11. Check the Y B/D
Module output circuit
Yes
No
8. Check the Vs, Va
voltage output circuit.
Doesn't the
Vs, Va voltage output
come out?
Yes
No
No
5. Check the VSC RL-ON
signal.
Doesn't the
VSC signal RL-ON
come out?
Yes
6. Check the VSC low
pressure output
Doesn't the
VSC low pressure
output come out?
Yes
- 14 -
TROUBLE SHOOTING GUIDE
1-2. Sony Power Board Structure
1 2 3
T502: Vs Trans
T702: Va Trans
T101: St-by Trans
T103: Low Voltage Trans
- 15 -
TROUBLE SHOOTING GUIDE
1-3. Sanken, LGIT Power Board Structure
1 2 3
T221: Vs Trans
T271: Va Trans
T121: St-by Trans
T201: Low Voltage Trans
- 16 -
TROUBLE SHOOTING GUIDE
2. No Power
(1) Symptom
¯
Does’t minute discharge at module.
¯
Non does not come in into the front LED.
(2) Check following
Is plug in power cord?
Plug in power cord.
Yes
No
Is the Line Filter and Power
Board Cable connected?
Connect the Cable.
Yes
No
Is the Fuse(F101) on
Power Board normal?
Replace the Fuse.
Yes
No
Is the Power Board and 7P of
VSC Board Cable connected?
Connect the Cable.
Yes
No
After the cable connect is remved
to Power Board(except the CN101
connection cable), the AC voltage
marking is authorized on manual.
When ST-BY 5V is not operated,
replace Power Board.
to Power Board(except the CN101
connection cable), the AC voltage
marking is authorized on manual.
When ST-BY 5V is not operated,
replace Power Board.
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