Read LG 50PT85-ZB (CHASSIS:PD74A) Service Manual online
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ADJUSTMENT INSTRUCTIONS
1. Application Object
These instructions are applied to all of the 50” PLASMA TV,
PD74A Chassis.
PD74A Chassis.
2. Note
(1) Because this is not a hot chassis, it is not necessary to use
an isolation transformer. However, the use of isolation
transformer will help protect test instrument.
transformer will help protect test instrument.
(2) Adjustment must be done in the correct order.
(3) The adjustment must be performed in the circumstance of
(3) The adjustment must be performed in the circumstance of
25±5°C of temperature and 65±10% of relative humidity if
there is no specific designation.
there is no specific designation.
(4) The input voltage of the receiver must keep 100-240V~,
50/60Hz.
(5) Before adjustment, execute Heat-Run for 30 minutes at RF
no signal.
3. Channel memory Setting Method
: You can set channel memory by R/C for adjustment.
1) Press ADJ key of Adjust Remote Controller.(P/N:105-210M)
2) Select ‘Channel Recover’ by using
2) Select ‘Channel Recover’ by using
D
/
E
(CH +/-) key, and
press ‘VOL +’.
3) The set is turned off automatically.
4) Press ‘power’ key of Adjust Remote Controller.
4) Press ‘power’ key of Adjust Remote Controller.
4. PCMCIA CARD Checking Method
: You must adjust DTV ##(Scrambled) Channel and insert
PCMCIA CARD to socket.
1) If PCMCIA CARD works normally, normal signals display
on screen.
But it works abnormally, “No CA module” words display on
screen.
But it works abnormally, “No CA module” words display on
screen.
5. POWER PCB Assy Voltage
Adjustments
(Va, Vs Voltage adjustments)
5-1. Test Equipment :
D.M.M. 1EA
5-2.Connection Diagram for Measuring
: refer to Fig.1
5-3. Adjustment Method
(1) Va Adjustment
1) After receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal of D.M.M to Va pin of P805, connect
2) Connect + terminal of D.M.M to Va pin of P805, connect
- terminal to GND pin of P805.
3) 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
1) Connect + terminal of D.M.M to Vs pin of P805, connect
– terminal to GND pin of P805.
2) After turning VR951, voltage of D.M.M adjustment as
same as Va voltage which on label of panel right/top.
(Deviation; ±0.5V)
(Deviation; ±0.5V)
Each PCB assembly must be checked by check JIG set.
(Because power PCB Assembly damages to PDP Module,
especially be careful)
(Because power PCB Assembly damages to PDP Module,
especially be careful)
(Fig.1) Connection diagram of power adjustment for measuring
<42” EAY3292701>
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