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4-2
4. Troubleshooting
4-1-1. No Power
Symptom
The unit is dead. No led’s on the front cover light up.
-
Major
checkpoints
Check the following:
Check the internal cable connection status inside the unit.
Check the fuses of each part.
Check the output voltage of SMPS.
-
-
-
Diagnostics
40”
52”
Does proper Stand-By DC
A5V appear at TP - A5V?
Does proper DC A3.3V
appear at TP - A3.3V?
No
No
Does proper DC B3.3V, B9V, DDR1.9V,
A1.2V, appear at
TP - B3.3V, B9V, 1.9V, L101?
Lamp(Backlight) Off,
power indicator LED on
Change the Main PCB
40” : BN94-02945D
52” : BN94-02945E
No
No
Does proper Main
DC B12V, B13V, B5V appear at
TP - B12V, B13V, B5V?
Yes
Change the LVDS Cable
40” : BN96-10076A
52” : BN96-10074A
Lamp(Backlight) on, no video
No
Yes
Yes
Change 30p power cable
40” : BN39-01099V
52” : BN39-01099U
Replace the IP board.
40” : BN44-00264A
52” : BN44-00267A
Yes
Yes
Caution
Make sure to disconnect the power before working on the IP board.
Содержание LN40B550K1H
Страница 62: ...4 3 4 Troubleshooting L1 B13V B5V B12V B5V 1 9V B3 3V B9V ...
Страница 64: ...4 5 4 Troubleshooting Pin 16 17 Pin 34 35 TP67 TP69 TP71 TP72 TP70 ...
Страница 65: ...4 6 4 Troubleshooting WAVEFORMS 1 PC input V sink H sink R G B 2 LVDS output ...
Страница 67: ...4 8 4 Troubleshooting Pin 16 17 Pin 34 35 Pin 12 Pin 7 ...
Страница 68: ...4 9 4 Troubleshooting WAVEFORMS 3 HDMI input RX_Data RX_Clk 2 LVDS output ...
Страница 70: ...4 11 4 Troubleshooting Pin 16 Pin 17 Pin 2 Pin 4 Pin 8 ...
Страница 71: ...4 12 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output ...
Страница 73: ...4 14 4 Troubleshooting Pin 16 17 Pin 34 35 Pin 2 Pin 4 ...
Страница 74: ...4 15 4 Troubleshooting WAVEFORMS 2 LVDS output ...
Страница 76: ...4 17 4 Troubleshooting Pin 16 17 Pin 34 35 V3CVBS COMY ...
Страница 77: ...4 18 4 Troubleshooting WAVEFORMS 4 CVBS OUT Grey Bar 2 LVDS output ...
Страница 79: ...4 20 4 Troubleshooting Pin 16 17 Pin 34 35 COMY COMPB COMPC ...
Страница 80: ...4 21 4 Troubleshooting WAVEFORMS 5 Compnent_Y Gray scale Pb Pr Color bar 2 LVDS output ...
Страница 82: ...4 23 4 Troubleshooting R416 B12V COMSL COMSR V2SR V2SL TP_L L R R DSL DSR TP_915 TP_916 B3 3V ...
Страница 83: ...4 24 4 Troubleshooting WAVEFORMS 6 I2C Data 7 Speaker out ...
Страница 119: ...6 6 6 Wiring Diagram Memo ...