Adjustment Method - LG 50PT490B Service Manual

6. Test of RS-232C control.
- Press In-Start button of Service Remocon then set the "4.Baud
Rate" to 115200. Then check RS-232C control and
7. Selection of Country option.
- Selection of country option is allowed only North American
model (Not allowed Korean model). It is selection of Country
about Rating and Time Zone.
(1) Models: All models which PB82C Chassis (See the first
page.)
(2) Press "In-Start" button of Service Remocon, then enter the
"Option" Menu with "PIP CH-" Button
(3) Select one of these three (USA, CANADA, MEXICO)
defends on its market using "Vol. +/-"button.
Caution : Don't push The INSTOP KEY after completing the
function inspection
Caution : Inspection only PAL M / NTSC
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)
Copyright ©2011 LG Electronics Inc. All rights reserved.
Only for training and service purposes
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
<XPOWER4 50T3 PSU>
< fig.1 : 50 inch Power PCB Assy Voltage adjustment >

9-1. Adjustment method

(1) Vs adjustment (refer fig.1)
1) Connect + terminal of D.M.M. to Vs pin of P811, connect
-terminal to GND pin of 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 P811, connect
-terminal to GND pin of P811.
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
- 11 -
.
CENTER (DEFAULT)
Cool Mid
192 192
192 192
192 192
64 64
64 64
64 64
LGE Internal Use Only
Warm
192
192
192
64
64
64