Read LG 42LG70YD (CHASSIS:LJ83A) Service Manual online
5. GND and ESD Testing
5.1. Prepare GND and ESD Testing.
• Check the connection between set and power cord
5.2. Operate GND and ESD auto-test
• Fully connected (Between set and power cord) set enter the
Auto-test sequence.
• Connect D-Jack AV jack test equipment.
• Turn on Auto-controller(GWS103-4)
• Start Auto GND test.
• If its result is NG, then notice with buzzer.
• If its result is OK, then automatically it turns to ESD Test.
• Operate ESD test
• If its result is NG, then notice with buzzer.
• If its result is OK, then process next steps. Notice it with
• Turn on Auto-controller(GWS103-4)
• Start Auto GND test.
• If its result is NG, then notice with buzzer.
• If its result is OK, then automatically it turns to ESD Test.
• Operate ESD test
• If its result is NG, then notice with buzzer.
• If its result is OK, then process next steps. Notice it with
Good lamp and STOPER Down.
5.3. Check Items.
• Test Voltage
- GND: 1.5KV/min at 100mA
- Signal: 3KV/min at 100mA
- Signal: 3KV/min at 100mA
• Test time: just 1 second.
• Test point
• Test point
- GND test: Test between Power cord GND and Signal
cable metal GND.
- ESD test: Test between Power cord GND and Live and
neutral.
• Leakage current: Set to 0.5mA(rms)
6. Default Service option
6.1. ADC-Set
• R-Gain adjustment Value (default 128)
• G-Gain adjustment Value (default 128)
• B-Gain adjustment Value (default 128)
• R-Offset adjustment Value (default 128 )
• G-Offset adjustment Value (default 128 )
• B-Offset adjustment Value (default 128 )
• G-Gain adjustment Value (default 128)
• B-Gain adjustment Value (default 128)
• R-Offset adjustment Value (default 128 )
• G-Offset adjustment Value (default 128 )
• B-Offset adjustment Value (default 128 )
6.2. White balance. Value.
6.3. Temperature Threshold
• Threshold Down Low
20
• Threshold Up Low
23
• Threshold Down High
70
• Threshold Up High
75
- 19 -
CENTER(DEFAULT)
Cool
Mid
Warm
R Gain
192
192
192
G Gain
192
192
192
B Gain
192
192
192
R Cut
64
64
64
G Cut
64
64
64
B Cut
64
64
64
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