42LD550 (CHASSIS:LA02B) - LG TV Service Manual (repair manual). Page 16

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- Check that Power Cord is fully inserted to the SET.

(If loose, re-insert)

- Unit fully inserted Power cord, Antenna cable and A/V

arrive to the auto-check process. 

- Connect D-terminal to AV JACK TESTER
- Auto CONTROLLER(GWS103-4) ON
- Perform GND TEST
- If NG, Buzzer will sound to inform the operator.
- If OK, changeover to I/P check automatically.

(Remove CORD, A/V form AV JACK BOX)

- Perform I/P test
- If NG, Buzzer will sound to inform the operator.
- If OK, Good lamp will lit up and the stopper will allow the

pallet to move on to next process.

• TEST voltage

- GND: 1.5KV/min at 100mA
- SIGNAL: 3KV/min at 100mA

• TEST time: 1 second
• TEST POINT

- GND TEST = POWER CORD GND & SIGNAL CABLE

METAL GND

NEUTRAL

• LEAKAGE CURRENT: At 0.5mArms

Measurement condition: 
1. RF input : Mono, 1KHz sine wave signal, 100%

Modulation 

2. CVBS, Component : 1KHz sine wave signal 0.4Vrms 

3. RGB PC : 1KHz sine wave signal 0.7Vrms 

No Item  Min 

Typ 

Max 

Unit 

1. Audio practical max

9.0 10.0 

12.0  W  EQ 

Off 

Output, L/R 

AVL Off 

(Distortion=10%  

8.5 

8.9 

9.8 

Vrms

Clear 

max Output) 

Voice Off

2. Speaker (8

Ω

TDB TDB  W  EQ 

On 

Impedance) AVL 

On

Clear 

Voice On 

Power Status 

Main B/D Shipping Condition 

AC Swithch condtion

Chassis Module Assembly ON N/A 

Front Module Assembly

N/A OFF 

Factory incoming 

ON 

OFF 

Final Assembly 

ON 

ON 

Ship-Out OFF 

ON