4-4
4. Troubleshooting
4-3. When the screen is blank (Analog)
Symptom
- Even though the LED power turns on, the screen is blank when connecting the DVI-I to D-sub
cable.
Major checkpoints
- Check the DVI-I to D-sub cable connections.
- Check whether the LVDS(FFC) cable is connected correctly to the panel.
- Check whether the lamp connector of the panel is connected correctly to the Inverter.
Diagnostics
CN601
CN400
X201
IC101
IC200
CN700
Yes
No
Check the R113, R117 and
R120 input terminals.
No
Check the circuits related to
IC200.
No
Check the circuits related to
CN400.
Do output signals appear at pins 8 to 30
of CN400?
No
Is DC 5V measured at pins 1, 2 and 3
of CN400?
Do the
③
Hsync and
④
Vsync
waveforms appear at pins 32, 33 of
IC200, respectively?
②
Do the RGB inputs appear at R113,
R117 and R120 of CN102?
①
Is X201 oscillating correctly?
Check and replace the panel.
No
Check and replace the circuits
related to X201.
Yes
Yes
Yes
Check the +5V_PANEL signal
and the BL_EN signal.
Yes
Check the signal cables and
their connections.
Yes
Caution
Make sure to disconnect the power before working on the Adaptor.
Содержание LEF22VS
Страница 7: ...3 4 3 Disassembly and Assembly Memo ...
Страница 21: ...1 4 1 Precautions Memo ...
Страница 27: ...2 6 2 Product specifications Memo ...
Страница 30: ...4 3 4 Troubleshooting 4 2 1 Circuit diagrams when the power does not turn on ...
Страница 32: ...4 5 4 Troubleshooting 4 3 1 When a blank screen is displayed Analog ...
Страница 33: ...4 6 4 Troubleshooting 4 3 2 Waveforms when no screen is displayed Analog ...
Страница 35: ...4 8 4 Troubleshooting 4 4 1 Circuit diagrams when a blank screen is displayed Digital ...
Страница 36: ...4 9 4 Troubleshooting 4 4 2 Waveforms when a blank screen is displayed Digital 1 2 ...
Страница 38: ...4 11 4 Troubleshooting 4 5 1 Circuit diagrams when a blank screen is displayed HDMI ...
Страница 39: ...4 12 4 Troubleshooting 4 5 2 Waveforms when a blank screen is displayed HDMI 1 2 ...
Страница 48: ...4 21 4 Troubleshooting Inputting the Code HDCP 1 Run the service exe file 2 Click the HDCP button ...
Страница 50: ...6 1 6 Wiring Diagram 6 Wiring Diagram 6 1 Wiring Diagram Main Board ...
Страница 53: ...6 4 6 Wiring Diagram Memo ...