Read Sharp LL-171ME Service Manual online
LL-171ME
TROUBLESHOOTING
4 – 3
(Yes)
(Yes)
(Yes)
(No)
Sound signals are input to
MSP3415 (UT10) (Pins 41, 42 in
external input)?
MSP3415 (UT10) (Pins 41, 42 in
external input)?
Check each sound signal
line and AV connector and
cable.
line and AV connector and
cable.
(No)
5-V voltage is input to Pins 10,
49, 63 of MSP3415 (UT10) and
9-V voltage to Pin 31.
49, 63 of MSP3415 (UT10) and
9-V voltage to Pin 31.
Check U12 and circuits
around it.
around it.
(No)
IIC bus (Pins 1, 2 of UT10) is
normal?
normal?
TV tuner (UT13)
VPC3230 (UT8)
PW1231 (U29)
PW166 (U21)
THC63LVDM83A (U24)
Connector (W5)
LCD relay PWB connection cable
LCD relay PWB
LCD unit
VPC3230 (UT8)
PW1231 (U29)
PW166 (U21)
THC63LVDM83A (U24)
Connector (W5)
LCD relay PWB connection cable
LCD relay PWB
LCD unit
AD9883A (U19)
PW166 (U21)
THC63LVDM83A (U24)
Connector (W5)
LCD relay PWB connection cable
LCD relay PWB
LCD unit
Input to speaker?
Check IIC bus line and
around it.
around it.
(Yes)
(No)
Sound is heard when AV or PC
sound is input.
sound is input.
(Yes)
(Yes)
The TV signal is nomal reception?
(Yes)
Pins 36 of UT5 (R129) and 37
(R128) have a synchronous input?
(R128) have a synchronous input?
(Yes)
The imege is output 23 pin of UT5
(RT158) is input to ?
(RT158) is input to ?
(Yes)
The signal is output to Pins 32,
33, and 34 of UT5?
33, and 34 of UT5?
(Yes)
That signal is input to Pins 13, 14
and15 of UT12?
and15 of UT12?
Check UT8 and areas around it.
Go to "No sound".
(Yes)
(Yes)
(Yes)
(No)
There are output (20, 21 of
UT10) of MSP3415?
UT10) of MSP3415?
MSP3415 (UT10) is defective.
In the state of reception, it
may not be normal.
may not be normal.
Check YT3, and areas
around it.
around it.
Check UT8 and areas
around it.
around it.
Check UT8, QT8 and
areas around it.
areas around it.
Check UT5 and areas
around it.
around it.
Check UT12 and areas
around it.
around it.
(No)
11.5-V voltage is input to
amplifier (Pin 1 of U27)?
amplifier (Pin 1 of U27)?
Signal is input to input terminal
(Pin 50 of UT10) of MSP3415?
(Pin 50 of UT10) of MSP3415?
(Yes)
Check MSP3415 (UT10) and
circuits around it.
circuits around it.
(Yes)
Speaker and speaker connections
defective. Headphone, headphone
jack connections defective.
defective. Headphone, headphone
jack connections defective.
Signal is input to input terminal
(Pin 47 of UT10) of MSP3415
when monaural signal is input?
(Pin 47 of UT10) of MSP3415
when monaural signal is input?
Check F4 and Q5 and
circuits around them.
circuits around them.
(No)
Amplifier output (W6)?
Check amplifier (U27) and
circuits around it.
circuits around it.
(No)
Check speaker cable and
connector.
connector.
(No)
(No)
(No)
(No)
(No)
(No)
Check signal between TV
tuner SIF output (Pin 15 of
UT1) and UT10.
tuner SIF output (Pin 15 of
UT1) and UT10.
Check signal between TV
tuner AOUDIO output (Pin
16 of UT1) and UT10.
tuner AOUDIO output (Pin
16 of UT1) and UT10.
(No)
No sound
No TV sound
Not operate TELETEXT
Bit missing
Check display data along the flow of each source signal.
TV display
Video display
(composite scart, S, D terminals)
(composite scart, S, D terminals)
PC display
YT3 (generater) 12Mhz is output?
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