4-2
4. Troubleshooting
4-1-2. No Power
Symptom
The LEDs on the front panel do not work when connecting the power cord.
-
The SMPS relay does not work when connecting the power cord.
-
The units appears to be dead.
-
Major
checkpoints
The IP relay or the LEDs on the front panel does not work when connecting the power cord if the cables are
improperly connected or the Main Board or SMPS is not functioning. In this case, check the following:
Check the internal cable connection status inside the unit.
-
Check the fuses of each part.
-
Check the output voltage of SMPS.
-
Replace the Main Board.
-
Diagnostics
Lamp(Backlight) Off,
power indicator LED off?
Lamp(Backlight) Off,
power indicator LED on?
Does proper DC B13V appear at
LVDS connector Pin #1~5 of T-con b’d?
Does proper DC B13V appear at
F1 of T-con b’d?
A power is supplied to set?
Does proper Stand-By DC A5V
appear at TP - A5V1?
Does proper Main DC B13V, B5V
appear at TP - B13V1, B5V2?
Does proper DC A3.3V appear at
TP - A3.3V1?
Does proper B3.3V, B1.8V, SPI_3.3V
appear at TP - B3.3V1, B1.8V1, SPI_A3.3 ?
Change the 18p power cable.
Change INVERTER/BALANCE B’D.
Change the LVDS cable.
Change the T-con b’d.
Check a other function.(No picture part)
Replace a LCD Panel.
Change the Main Assy.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
Caution
Make sure to disconnect the power before working on the IP board.
Summary of Contents for LE26C45 Series
Page 28: ...4 3 4 Troubleshooting ...
Page 30: ...4 5 4 Troubleshooting ...
Page 31: ...4 6 4 Troubleshooting WAVEFORMS 1 PC input V sink H sink R G B 2 LVDS output ...
Page 33: ...4 8 4 Troubleshooting ...
Page 34: ...4 9 4 Troubleshooting WAVEFORMS 3 HDMI input RX_Data RX_Clk 2 LVDS output ...
Page 36: ...4 11 4 Troubleshooting ...
Page 37: ...4 12 4 Troubleshooting WAVEFORMS 2 LVDS output ...
Page 39: ...4 14 4 Troubleshooting ...
Page 40: ...4 15 4 Troubleshooting WAVEFORMS 2 LVDS output ...
Page 42: ...4 17 4 Troubleshooting ...
Page 43: ...4 18 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output ...
Page 45: ...4 20 4 Troubleshooting ...
Page 46: ...4 21 4 Troubleshooting WAVEFORMS 5 Compnent_Y Gray scale Pb Pr Color bar 2 LVDS output ...
Page 48: ...4 23 4 Troubleshooting ...
Page 49: ...4 24 4 Troubleshooting WAVEFORMS 6 Speaker out ...
Page 66: ...4 41 4 Troubleshooting 4 9 3 Main Inner 2 4 9 4 Main Inner 3 ...
Page 67: ...4 42 4 Troubleshooting 4 9 5 Main Bottom ...
Page 68: ...4 43 4 Troubleshooting 4 9 6 Power_32 SMPS LC5XX 4 9 7 Power_37 SMPS LC5XX ...
Page 69: ...4 44 4 Troubleshooting 4 9 8 Power_40 SMPS LC5XX 4 9 9 Power_46 SMPS LC5XX ...
Page 70: ...4 45 4 Troubleshooting 4 9 10 Power_26 SMPS LC45X 4 9 11 Power_32 SMPS LC45X ...