4-2
4. Troubleshooting
4-1-1. 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
LA22B350F2
LA22B450C8
Does proper DC A3.3V
appear at R1111?
Check a IC1106
Change a main PCB ass’y
No
Yes
Does proper DC A2.5V, A1.2V appear at
R1110, C1116?
No
Yes
LAMP off, power indicator
LED red color?
Yes
No
Check a connection a power cable.
Does proper DC5V appear at
pin 6 of CN1001?
No
Yes
A power is supplied to set?
Change a Assy PCB Power.
Check a IC1105, IC1107
Change a main PCB ass’y
1
2
3
4
Caution
Make sure to disconnect the power before working on the IP board.
Содержание LA22B350F2
Страница 20: ...1 4 1 Precautions Memo ...
Страница 30: ...4 4 4 Troubleshooting WAVEFORMS 1 R G B Output Signal ...
Страница 32: ...4 6 4 Troubleshooting WAVEFORMS 2 Digital Output Data 3 Signal of HDMI Data ...
Страница 34: ...4 8 4 Troubleshooting WAVEFORMS 3 CVBS Output Signal 4 Tuner_CVBS Output Signal ...
Страница 36: ...4 10 4 Troubleshooting WAVEFORMS 4 CVBS Output Signal ...
Страница 38: ...4 12 4 Troubleshooting WAVEFORMS 6 The Signal are Inputed to IC1201 7 The Signal are Inputed to IC1202 ...
Страница 55: ...6 3 6 Wiring Diagram 6 2 Wiring Picture LA22B350F2 LA22B450C8 ...