LG 50PT350 Service Manual page 59

Repair Process-Reference data
A. Picture Problem
전자 - 6-2
Making 2010. 11. 16
PDP TV
Symptom
Control Board Checking Method(50R3) A13
Revision
▣ Checking Method
④ Check IC ( IC53, IC51 )
① Check input voltages(5V of P105 / 18V of P2) at control
IC53
IC51
board.
5V
② Check LED is on.
3.3V
3.3V
GND
③ If LED doesn't work, check crystal X1 output.
④ Check 3.3V, 5V IC.
⑤ Check MCM at VS_DA by using digital multi meter.
② Check LED On
③ Check Crystal(X1)
Check oscillation of Crystal
(Normal: 25 MHZ)
⑤ Check MCM
P2(18V)
Pin14, 15
P105_FL1,FL2(5V)
MCM Check point
(+)VS_DA / (-) GND
Pin 14,15 : 18V
(Normal: 3.3V )
① Check Input voltage
A13
ⓒ LG Electronics. Inc.2009