Read LG 50PS80BD-SA (CHASSIS:PB92A) Service Manual online
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) 42Inch/50Inch Adjustment method for Power board
- After Changing RF snow noise.
1) Connection Diagram for measuring
2) Vs Adjustment
Connect + terminal of D. M..M. to Vs pin of P811,
connect - terminal to GND pin of P811.
After turning VR901, voltage of D.M.M adjustment as
same as Vs voltage which on label of panel right/top (
deviation ; ±0.5V)
deviation ; ±0.5V)
(4) 50FHD Adjustment method for Power board
- After Changing RF snow noise.
1) Connection Diagram for measuring
2) Va Adjustment
Connect + terminal of D. M..M. to Va pin of P811,
connect - terminal to GND pin of P811.
After turning VR501, voltage of D.M.M adjustment as
same as Va voltage which on label of panel right/top (
deviation ; ±0.5V)
deviation ; ±0.5V)
3) Vs Adjustment
Connect + terminal of D. M..M. to Vs pin of P811,
connect - terminal to GND pin of P811.
After turning VR901, voltage of D.M.M adjustment as
same as Vs voltage which on label of panel right/top (
deviation ; ±0.5V)
deviation ; ±0.5V)
(5) 60FHD Adjustment method for Power board
- After Changing RF snow noise.
1) Connection Diagram for measuring
2) 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)
3) 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)
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Connection Diagram of power adjustment for measuring.
Connection Diagram of power adjustment for measuring.
Connection Diagram of power adjustment for measuring.
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