Prepare Gnd And Esd Testing; Operate Gnd And Esd Auto-Test; Power Pcb Ass’y Voltage Adjustment (Va/Vs Voltage Adjustment); Adc-Set - LG 50PJ350 Service Manual

8. GND and ESD Testing

8-1. Prepare GND and ESD Testing.

- Check the connection between set and power cord

8-2. Operate GND and ESD auto-test.

(1) Fully connected (Between set and power cord) set enter
the Auto-test sequence.
(2) Connect D-Jack AV jack test equipment.
(3) Turn on Auto-controller(GWS103-4)
(4) Start Auto GND test.
(5) If its result is NG, then notice with buzzer.
(6) If its result is OK, then automatically it turns to ESD Test.
(7) Operate ESD test
(8) If its result is NG, then notice with buzzer.
(9) If its result is OK, then process next steps. Notice it with
Good lamp and STOPER Down.
8-3. Check Items.
(1) Test Voltage
GND: 1.5KV/min at 100mA
Signal: 3KV/min at 100mA
(2) Test time: just 1 second.
(3) 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.
(4) Leakage current: Set to 0.5mA(rms)
9. POWER PCB Ass'y Voltage
Adjustment
(Va/Vs Voltage Adjustment)
(1)Test equipment : D.M.M 1EA
(2) Connection Diagram for Measuring : refer to fig.1
< fig.1 : 50HD Power PCB Assy Voltage adjustment >
Copyright ©2010 LG Electronics Inc. All rights reserved.
Only for training and service purposes

9-1. Adjustment method

(1) Vs adjustment (refer fig.1)
1) Connect + terminal of D.M.M. to Vs pin of
P812(42":P811), connect -terminal to GND pin of
P812(42":P811)
2) After turning VR901, voltage of D.M.M adjustment as
same as Vs voltage which on label of panel left/top (
deviation ; ±0.5V)
(2) Va adjustment (refer fig.1)
1) After receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal of D.M.M. to Va pin of
P812(42":P811), connect -terminal to GND pin of
P811(42":P812).
3) After turning VR502,voltage of D.M.M adjustment as
same as Va voltage which on label of panel left/top
(deviation; ±0.5V)
10. Default Service option.

10-1. ADC-Set

R-Gain adjustment Value (default 128)
V
G-Gain adjustment Value (default 128)
V
B-Gain adjustment Value (default 128)
V
R-Offset adjustment Value (default 128)
V
G-Offset adjustment Value (default 128)
V
B-Offset adjustment Value (default 128)
V
10-2. White balance. Value.
R Gain
G Gain
B Gain
R Cut
G Cut
B Cut
10-3. Temperature Threshold
Threshold Down Low 20
V
Threshold Up Low
V
Threshold Down High 70
V
Threshold Up High
V
- 13 -
.
CENTER (DEFAULT)
Cool Mid
192 192
192 192
192 192
64 64
64 64
64 64
23
75
LGE Internal Use Only
Warm
192
192
192
64
64
64