Sharp LC-32SV21L, Service Manual

Page: 39 / 101

2008-03-14
LC-32SV21L&LC-42SV31L
39
No sound from external input devices (3)
↓
Does not the sound of the audio signal input to (VGA) go out?
MAIN UNIT:
↓
↓ YES
↓ YES
No sound from external input devices (4)
↓
Does not the sound of the audio signal input to (HDMI1/2) go out?
↓
↓ YES
No picture on the display (1)
↓
The picture doesn't appear in all modes.
MAIN UNIT:
↓
↓ NO
YES
↓ YES
PANEL_UNIT:
↓ YES
↓ YES
Is the audio signal properly sent to pin (2) (VGA_L_In) and pin (3)
(VGA_R_In) of CN102?
NO
Check the connection to CN102 and the external input device.
Refer to “ No sound output in all modes ” .
Is the audio signal properly sent to pin (AD22) (VGA_L_In) and pin
(AC25) (VGA R In) of IC U401? NO Check the line between CN102 and IC U401.
Refer to
“
No sound output in all modes
”
.
Is picture of the signal input from HDMI 1/2 displayed? NO Refer to “ Does not the picture of the HDMI signal input to
HDMI1/2 go out? ” .
Is LCD controller's control signal normal?
Check the line between IC U401 and CN409, CN408.
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
module?
NO
Wire harness is checked. (Main board to Panel module )
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 ″ ))
Check IC U401 and its peripheral control circuits.
Is the above-mentioned LVDS signals output to connector
CN409(for32
″ ), CN408(for 42 ″ )?
NO