SIGLENT
48 SDS1000CML/CNL/DL Service Manual
Check the Display Module
Here are procedures for testing the Display Module:
1. Disconnect the power cord and make sure the display module cable and the
backlight inverter cable are correctly connected.
2. Connect the power cord and turn on the oscilloscope. If the screen remains
dark, then go to test the voltage value of the backlight inverter cable.
If the measurement is within the range of -11V ~ -9V, please reconnect the
backlight inverter cable to make sure its correct connecting. If the screen still
remains dark as a consequence, a new LCD is required.
If the measurement is beyond the range of -11V ~ -9V, you need to replace a
new power supply board.
3. If the screen gets bright but displaying abnormal, then go to test the “30M
Clock” point located on the main board.
If the Clock tested is 30M, then the failure may come from the display
module, you need to return the oscilloscope to manufacturer to have it
repaired by qualified personnel.
Otherwise, the failure may come from the main board, a new one is required
necessary.
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