LG 50PW450 Service Manual - Page 59

Checking Method

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Repair Process-Reference data PDP TV Symptom A. Picture Problem Control Board Checking Method(50R3) Making Revision ▣ Checking Method ④ Check IC ( IC53, IC51 ) ① Check input voltages(5V of P105 / 18V of P2) at control IC53 board. ② Check LED is on. 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) 2010. 11. 16 전자 - 6-2 A13 IC51 3.3V 5V 3.3V GND ⑤ Check MCM MCM Check point (+)VS_DA / (-) GND (Normal: 3.3V ) P105_FL1,FL2(5V) P2(18V) Pin14, 15 Pin 14,15 : 18V A13 ① Check Input voltage ⓒ LG Electronics. Inc.2009

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ⓒ
LG Electronics. Inc.2009
Making
전자
- 6-2
Revision
PDP TV
Symptom
A. Picture Problem
Control Board Checking Method(50R3)
Repair Process-Reference data
A13
▣
Checking Method
A13
①
Check input voltages(5V of P105 / 18V of P2) at control
board.
②
Check LED is on.
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.
③
Check Crystal(X1)
①
Check Input voltage
④
Check IC ( IC53, IC51 )
Check oscillation of Crystal
(Normal: 25 MHZ)
MCM Check point
(+)VS_DA / (-)
GND
(Normal: 3.3V )
⑤
Check MCM
3.3V
Pin 14,15
: 18V
IC51
IC53
P2(18V)
Pin14, 15
5V
3.3V
GND
P105_FL1,FL2(5V)
②
Check LED On
2010. 11. 16