Norcent LT2725 - Troubleshooting No Sound

27’’ LCD TV Color Monitor Norcent LT2725
23
5.2 No sound
Test TC200 (U2) PIN9 PIN10 PIN11
PIN 12 is normal
Check SF701 PIN5、4 signal
input is normal?
Check TUNER circuit
Check ZR39660BGCG (U401) is normal?
CHECK X701 surge is normal?
Check CAS-220/CS (U701) is
normal?
Test TP2050 (U1) PIN17 PIN10 PIN8
PIN2 Output is normal?
Check speakers are ok?
Check earphone is normal?
Check Q2 MUTE circuit
Check TPA6110A2 (U600)
Relative circuit is normal?
Test NJM2199 (U5) PIN 12 PIN
11 output is normal?
Check CS4335 (U405) PIN5
PIN 8 output is normal?
Check TC200 (U2) PIN21
power supply is normal?
Check NJM2199 (U5) PIN8 power
supply is normal?
Check TP2050 (U1) PIN15 PIN7 PIN4
power supply is 20V; PIN23 PIN25 power
su
pp
l
y
is 5V?
OK
OK
NG
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG