50PB65-ZA (CHASSIS:PD73A) - LG TV Service Manual (repair manual). Page 6

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These instructions are applied to all of the 50” PLASMA TV,
PD73A Chassis.

(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.

(2) Adjustment must be done in the correct order.
(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.

(4)  The  input  voltage  of  the  receiver  must  keep  100-240V~,

50/60Hz.

(5) The receiver must be operated for about 15 minutes prior

to the adjustment.

O

After  RGB  Full  white  HEAT-RUN  Mode,  the  receiver  must

be operated prior to adjustment.

O

Enter into HEAT-RUN MODE

1) Press the POWER ON KEY on R/C for adjustment.
2) OSD display and screen display PATTERN MODE.

* Set is activated HEAT-RUN without signal generator in

this mode.

* Single color pattern(RED/BLUE/GREEN) of HEAT-RUN 

mode uses to check PANEL.

: You can set channel memory by R/C for adjustment.

1) Press ADJ key on R/C for adjustment.
2) Press ENTER key on “System Control3”.
3) Press VOL + key on “Channel Recover”.

: You must adjust DTV 29 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.

(Va, Vs Voltage adjustments)

D.M.M. 1EA

: refer to Fig.1

1) After receiving 100% Full White Pattern, HEAT RUN.
2) Connect + terminal of D.M.M to Va pin of P12, connect -

terminal to GND pin of P12.

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)

1) Connect + terminal of D.M.M to Vs pin of P12, connect –

terminal to GND pin of P12.

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)

If you turn on a still screen more than 20 minutes (Especially
Digital pattern, Cross Hatch Pattern), an afterimage may occur
in the black level part of the screen.

Each PCB assembly must be checked by check JIG set.
(Because power PCB Assembly damages to PDP Module,
especially be careful)

(Fig. 1) Connection diagram of power adjustment for measuring

<50” EAY32929001 only for 50PB56>

<50” 6709900020A>