LC-32A28L, LC-42A48L
32
No sound from external input devices (4)
↓
Does not the sound of the audio signal input to HDMI1/2 go out?
↓
↓YES
The audio signal is not output (1)
↓
No audio signal output from LINE_AUDIO_OUTPUT terminal.
TEREMINAL UNIT: ↓
↓NO
↓NO
No picture on the display (1)
↓
The picture doesn't appear in all modes.
MAIN UNIT: ↓
↓NO
YES
↓YES
PANEL_UNIT:
↓YES
↓YES
Refer to “No sound output in all modes”.
Is picture of the signal input from HDMI1/2 displayed?
NO
Refer to “Does not the picture of the HDMI signal input to
HDMI1/2 go out?”.
Is the audio signal output from IC U401 pin(110) (AL1) and pin(106)
(AR1) sent to pin(13)(-INL) and pin(2)(-INR) of IC U601?
Is audio signal output from IC U601 sent to pin(12)(LO_L) and pin
(3)(LO_R) of LINE_AUDIO_OUT connector(CN601)?
YES
Check the connection to LINE_AUDIO_OUT and external
devices.
YES
Check the line between IC U401 and IC U601.
Check IC U401 and its peripheral circuits.
Is LCD controller's control signal normal?
Is the above-mentioned LVDS signals output to connector CN110?
NO
Check the line between IC U401 and CN110.
NO
Control signals BRIGHT_ADJ, INVERTER_ON_OFF,
PANEL_VCC_ON/OFF, and it peels off and whether normality is
checked.
Check the panel module.
Similarly, is the LVDS signal input to connector of the panel
NO
Wire harness is checked.
Is LVDS signal output from 1st_channel and 2nd_channel of IC U401 in each mode?
(A0N/A0P),(A1N/A1P),(A2N/A2P),(A3N/A3P),(CLK1N/CLK1P)
Check IC U401 and its peripheral control circuits.
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