Sharp LC-121M2E Service Manual page 24

LC-121M2E
LC-150M2E
No sound (Front No sound
and rear speaker) (AV1 outp
YES
No sound
ut)
YES YES
Check IC310, | nyo Are output at pin Is the pin 18 of | Noj Muting is applied.) | Is the pin 9 of
IC311 and their 7 of IC310 and it 1C2001 in Low Check the 1C2001 in Low
peripheral parts. of IC311 normal? state? LMUTE line.
YES YES
its peripheral 7 and 18 of Q301, Q302
parts. 1C312 normal? and their
YES peripheral parts
Is output at pins| NO| !s 13V input at
10,14 and 17 of pin 9 of IC305
1C305 normal? as specified?
YES YES parts. YES
Check speaker Check IC305 and Check speaker
unit and its its peripheral unit and its
peripheral parts.
(Front speaker)
O| Check 1C704,
Q704, Q706 and
their peripheral
is output at pins] NO| Check IC305
I
10 and 17 of
1C305 normal?
peripheral parts.
No sound
(Rear speaker)
YES
Is the pin 10 of
1C2001 in Low
state?
NO] Muting is applied.
Check the
FSMUT line.
YES
Are Q306, Q307 | No} Check Q306,
and IC304 Q307, IC304 and
normal? their peripherals.
YES
Is output at pin | NO| Check IC305
14 of IC305 and its
normal? peripherals.
YES
Check speaker
and its
peripherals.
No colour appears
No colour (AV1, AV2 and Component)
NO
ls output voltages Check peripherals.
at pins 3 and 6 of
IC406 normal?
YES
Are these voltages | NO_| Check |C801 and
as follows of iC801 its peripheral
normal? parts.
pins 51 and 52
(input)
pins 41, 42 and
43 (output)
No colour (AV1, AV2)
ls output voltages NO Check IC405 and
at pin 7 of IC405
normal?
its peripheral
parts.
Check peripherals.
Is input voltages
at pin 13 of
1C801 normal?
Is output voltages
at pins 5 and 6 of
{C801 normal?
YES
Check in/output
voltages of IC406.
NO Check IC801 and
its peripheral
parts.
24
No colour (Component)
Check in/output voltages of IC406.