LCD TV SERVICE MANUAL - TV & Monitor Service Manual Database

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