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.
-
-
-
-
Diagnostics
Yes
Does proper Main DC B13V,B12V,B5V
appear at BD105L,C1261,BD101?
Does proper DC STB3.3V
appear at C101?
Check IC105 Change the Main assembly
BN94-01628C
No
Yes
Does proper DC D3.3V,B8V,CORE1.1V
appear at C108,C110,C137?
No
Yes
Lamp(Backlight) Off, power indicator
LED on?
Yes
No
Check power cable.
P/N: BN39-00702F
Does proper Stand-By DC STB5V
appear at BD100?
No
Change the Main Power assembly
BN44-00202A
Yes
No
Does proper Inverter DC 120V appear
at CN801 in IP?
Yes
No
Check IC101,IC108,IC102
Change the Main assembly
BN94-02077B
Does proper D1.8V,A2.5V,A1.2V
appear at C115, C111, C112?
No
Yes
Check IC104, IC106, IC107
Change the Main assembly
BN94-02077B
A power is supplied to set?
No
Check a other function (No picture part)
Replace a LCD Panel
BN07-00518A
Caution
Make sure to disconnect the power before working on the IP board.
Summary of Contents for LN32A550P3F
Page 7: ...1 4 1 Precautions Memo ...
Page 162: ...4 3 4 Troubleshooting ...
Page 163: ...4 4 4 Troubleshooting ...
Page 165: ...4 6 4 Troubleshooting WAVEFORMS 1 2 PC Input V Sync H Sync 3 LVDS Out CLK ...
Page 168: ...4 9 4 Troubleshooting ...
Page 171: ...4 12 4 Troubleshooting ...
Page 174: ...4 15 4 Troubleshooting ...
Page 176: ...4 17 4 Troubleshooting WAVEFORMS 6 Tuner CVBS Out Pattern Grey Bar 7 TS DATA Out Clk Data 0 ...
Page 177: ...4 18 4 Troubleshooting ...
Page 180: ...4 21 4 Troubleshooting ...
Page 183: ...4 24 4 Troubleshooting ...
Page 186: ...4 27 4 Troubleshooting ...
Page 197: ...4 38 4 Troubleshooting Memo ...
Page 201: ...6 4 6 Wiring Diagram Memo ...