Beko V30 Service Bulletin page 23

No sound.
Picture is OK.
Check 28 VDC at pin 9 of IC304.
NO
Audio signal at pins 1,5 of IC304 are OK.
No sound.
NO
Audio signal at pins 28,29 of IC301 are OK.
No sound.
NO
Audio signal at R150 Trap Filter is OK.
No sound.
NO
Check and replace components R156, L105,
L106, C158, C159, C160, R150.
Volume decreases to minimum.
NO
Volume increases to maximum.
NO
Volume Up/Down buttons change programme
numbers.
NO
Pop sound is heard when switch off.
NO
Check and replace R321, R318, T307.
Check and replace IC304.
AUDIO DEFECTS (I)
NO
Check and replace components R341, D612,
YES
Check signals at pins 8, 10 of IC304.
YES
Check and replace R307, T301, R310, C326,
YES
Check and replace C230 and IC301.
AUDIO DEFECTS (II)
YES
Check and replace R437 and R444.
Check 3.3 VDC at pin 80 of IC101.
YES
Check and replace R436 and R445.
Check 3.3 VDC at pin 78 of IC101.
YES
Check and replace R438 and R441.
Check 3.3 VDC at pin 1 of IC101.
Check and replace R429, R317, C335.
YES
Standby voltages of T307: B(0.6V), C(0V)
Operation voltages of T307: B(0.1V), C(15.5V)
S603.
Check and replace IC304.
C332, R308, T305, R319.