Read LG 42LG7000 (CHASSIS:LD88F) Service Manual online
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TROUBLE SHOOTING
1. Power Board
1-1. The whole flow chart which it follows in voltage output state
Does not screen
whole comes out?
Yes
No
Yes
Start check
1. Check the Power off condition.
Is it identical with
power off condition?
Is the interface
signal operated?
Yes
2. Check the interface signal condition.
Yes
3. Check the St_by 5V
signal circuit.
Yes
4. Check the AC detect
signal circuit.
Yes
No
5. Check the VSC RL_ON
/PWR_ON/OFF signal.
No
No
No
Does not
low voltage output
comes out?
Yes
Does not the
St-by 5V(P-5V) signal
comes out?
Does not the
AC Detect signal
comes out?
No
Does not the
RL_ON/PWR_ON/OFF
comes out?
No
Yes
7. Check the VSC INV_CTL signal?
Yes
8. Check the INV 24V
voltage output circuit.
voltage output circuit.
Manufacture enterprise
meaning of a passage.
meaning of a passage.
Yes
6. Check the VSC low
Voltage output.
Voltage output.
Does not
inverter signal output
comes out?
Yes
Does not the
VSC signal INV_CTL
comes out?
Does not the
INV 24V voltage output
comes out?
No
Does not the
VSC Low voltage output
comes out?
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