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Erratic display
Possible cause Recommend action
Faulty LCD Replace LCD module
Poor connection of LCD cable Check and reconnect
Poor flikers adjustmet Readjust VR of flicking
Faulty internal PCB Replace main PCB assy
No audio sound
Possible cause Recommend action
Faulty speaker Replace the speaker
Poor contact of speaker connector Check and reconnect
Faulty internal PCB Replace main PCB assy
No display/No front light (other functions OK)
Possible cause Recommend action
Poor soldering of connector at main PCB Resolder connector pins
Poor contact of inverter cable/connector Check and reconnect
Faulty Internal PCB Replace inverter PCB
LCD (of front light lamp) fault Replace LCD module
No input at all
Possible cause Recommend action
Out of calibration of touch panel Recalibrate the touch panel
Scratch (damage) on touch panel Replace the LCD unit
Poor contact of connector Reconnect the touch panel cable
Internal data malfunction Reset (or full reset) the unit
Short circuit of key Replace short switch
Poor playback sound
Possible cause Recommend action
High pressure sound is recorded Leave the microphone from sound source
Low sampling frequency when recording Set hjgh sampling frequency rate
Faulty speaker Replace the speaker
No front light (Other fanctions OK)
Possible cause Recommend action
Poor contact of inverter connector Reconnect inverter connector CN1 and CN2
Faulty inverter PCB Replace the inverter PCB
Faulty lamp in LCD module Replace the LCD module