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.
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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.
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Diagnostics
Yes
Does proper Main B12VS_PW,
B13V_PW, B5V_PW appear at
TP2007~8, TP2020~2, TP2013~6?
Does proper B3.3V_PW, B1.9V_PW,
B1.25V_PW appear at
C2607, C2590, C2105?
Change the LVDS cable
No
Yes
Does proper PANEL_VCC_PW
appear at LVDS connector Pin #1~5
of T-con b’d?
No
Yes
Lamp(Backlight) Off,
power indicator LED on?
Yes
No
Change the 30P power cable
or IP board
Does proper Stand-By DC
A5V_PW appear at TP2004?
No
Change the Main Assy
Yes
Does proper A3.3V_PW
appear at R2028?
Yes
Does proper DC B12V
appear at F1 of T-con b’d?
No
Yes
Change the T-con b’d
No
No
A power is supplied to set?
No
Check a other function
(No picture part)
Replace a LCD Panel
Caution
Make sure to disconnect the power before working on the IP board.
Содержание LE32B53 SERIES
Страница 22: ...4 5 4 Troubleshooting PC RGB HV sync LVDS MAINBOARD B ...
Страница 23: ...4 6 4 Troubleshooting WAVEFORMS 1 PC input V sink H sink R G B 2 LVDS output ...
Страница 25: ...4 8 4 Troubleshooting HDMI3 HDMI2 HDMI1 MAINBOARD T ...
Страница 26: ...4 9 4 Troubleshooting WAVEFORMS 3 HDMI input RX_Data RX_Clk 2 LVDS output ...
Страница 28: ...4 11 4 Troubleshooting B5V_VCCT_PW B3 3V_PW TUNER_CVBS MAINBOARD T ...
Страница 29: ...4 12 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output ...
Страница 31: ...4 14 4 Troubleshooting B5V_VCCT_PW B3 3V_PW B1 2V_PW TS DATA MAINBOARD T ...
Страница 32: ...4 15 4 Troubleshooting WAVEFORMS 2 LVDS output ...
Страница 34: ...4 17 4 Troubleshooting AV2_CVBS MAINBOARD B ...
Страница 35: ...4 18 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output ...
Страница 37: ...4 20 4 Troubleshooting Pr Pb Y MAINBOARD B ...
Страница 38: ...4 21 4 Troubleshooting WAVEFORMS 5 Compnent_Y Gray scale Pb Pr Color bar 2 LVDS output ...
Страница 41: ...4 24 4 Troubleshooting WAVEFORMS 6 I2C Data 7 Speaker out ...
Страница 60: ...4 43 4 Troubleshooting 4 9 PCB diagram 4 9 1 PCB layout FHD 32 37 40 46 MAIN BOARD ...
Страница 61: ...4 44 4 Troubleshooting 4 9 2 Main TOP 4 9 3 Main Inner 2 ...
Страница 62: ...4 45 4 Troubleshooting 4 9 4 Main Inner 3 4 9 5 Main Bottom ...