Service manual

CONFIDENTIAL – DO NOT COPY
Page10-5
File No. SG-0174
1
PDP DISPLAY NOTHING(Analog HD1/AC on/off default)
Power LED is lighting?
Start
No
Yes
Check AC power cord
No
Press Meun or Info.
Is there any OSD’s logo
Power LED is lighting?
No
Check U3.4Î3.3V
No
D10,D11 LED is lighting?
Check internal cable?
1.LVDS cable.
Panel power
fail
U3 fail
Check U8Î1.8V
Check U9Î2.5V
No
U8 fail
No
U9 fail
If power_off Îhigh
U2,U5Î ON
Check +3.3V_SW
,+5V_SW,+12V_SW
(pin 5,6 and pin 7,8)
No
U2,U5 fail
Check Fuse open?
(F2,F3,F4)
Fuse fail
Yes
No
Yes
U13 fail
No
Yes
Check input source
Check internal cable?
1.CN1’s cable
2.CN3’s cable
No
Check main board CN3 pin 4Î studyby +5V
Check CN3 pin 3Î RLY_ON(high)
Check CN3 pin 2Î VS_ON(high)
Yse
Check CN1Îpin 1,2,3 = +5V
pin 7,8 = +12V
No
No
Yes
No
Power LED is lighting?
No
Check W1 pin 27 is high?
(Display_ON)
No
Remove R87.
Check U13 pin AD14.
Is AD14 high?
U13 fail
No
Yes
Yes
Yes
Check component 1
(Y signal) ÎC252
Is there sync?
No
Is picture on screen?
Yes
Block 1
No
Trace componect 1 from
Input To U13 circuit
Check R190,R191
Use GProbe connect
from main to PC.
Does scaler detect the signal?
Yes
No
U13 fail
PDP DISPLAY NOTHING(Analog HD1 without Y signal)