Read LG 50PQ30TD-SB (CHASSIS:PB91A) Service Manual online
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Brightness Spec.
8. 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
“4.Baud Rate” to 115200. Then check RS-232C control and
9. Selection of Country Option
(1) Models: All models which PB91A/PB92A Chassis.
(2) Press “In-Start” button of Service Remocon, then enter
(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.
10. GND and ESD Testing
10-1. Prepare GND and ESD Testing
Check the connection between set and power cord
10-2. 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
(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.
10-3. Check Items
(1) Test Voltage
- GND: 1.5KV/min at 100mA
- Signal: 3KV/min at 100mA
- Signal: 3KV/min at 100mA
(2) Test time: just 1 second.
(3) Test point
(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)
10-4. POWER PCB Assy Voltage Adjustment
(Va, Vs voltage adjustment) <— ONLY PDP
(1) Profile
To supply the Va, Vs voltage that the module want.
(2) Equipment :
Stick for adjustment, DMM
(3) Connection Diagram for Measuring
(4) Adjustment Method
Adjustment method for Power board
- After Changing RF snow noise.
- After Changing RF snow noise.
1) Va adjustment
Connect + terminal of D. M..M. to Va pin of P812,
connect -terminal to GND pin of P812.
After turning VR901,voltage of D.M.M adjustment as
same as Va voltage which on label of panel right/top
(deviation; ±0.5V)
(deviation; ±0.5V)
2) Vs adjustment
Connect + terminal of D. M..M. to Vs pin of P812,
connect - terminal to GND pin of P812.
After turning VR951, voltage of D.M.M adjustment as
same as Vs voltage which on label of panel right/top (
deviation ; ±0.5V)
deviation ; ±0.5V)
- 15 -
Connection Diagram of power adjustment for measuring.
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