Sharp LC-42SV32B Service Manual page 34

LC-42SV32B
Does not the sound of the audio signal input to (VGA) go out?
MAIN UNIT:
Is the audio signal properly sent to pin (2) (VGA_L_In) and pin (3)
(VGA_R_In) of CN102?
Is the audio signal properly sent to pin (AD22) (VGA_L_In) and pin
(AC25) (VGA R In) of IC U401?
Refer to "No sound output in all modes".
Does not the sound of the audio signal input to (HDMI1/2) go out?
Is picture of the signal input from HDMI 1/2 displayed?
Refer to "No sound output in all modes".
The picture doesn't appear in all modes.
MAIN UNIT:
Is LVDS signal output from 1st_channel and 2nd_channel of IC U401 in each mode?
(O0/O1/O2/O3/OCK (for 32")), (E0/E1/E2/E3/E4/ECK/O0/O1/O2/O3/O4/OCK (for 42"))
YES
Is the above-mentioned LVDS signals output to connector
CN409(for32"), CN408(for 42")?
Is LCD controller's control signal normal?
PANEL_UNIT:
Similarly, is the LVDS signal input to connector of the panel
module?
Check the panel module.
No sound from external input devices (3)
↓
↓
↓YES
↓YES
No sound from external input devices (4)
↓
↓
↓YES
No picture on the display (1)
↓
↓
↓YES
↓YES
↓YES
NO
Check the connection to CN102 and the external input device.
NO
Check the line between CN102 and IC U401.
NO
Refer to "Does not the picture of the HDMI signal input to
HDMI1/2 go out?".
Check IC U401 and its peripheral control circuits.
NO
Check the line between IC U401 and CN409, CN408.
Control signals BRIGHT_ADJ, INVERTER_ON_OFF,
NO
PANEL_VCC_ON/OFF, and it peels off and whether normality is
checked.
NO
Wire harness is checked. (Main board to Panel module )
34
↓NO