YES
Check STB board
Check main board
13.8V RIGHT?
NONO
Frontpanel Standbyled
No Power or Power shuts off
immediately
3V3S RIGHT?
NO Check U456
YES
Check Q703 Q706 circuit
Change FPP board,MDC board
YES
NO
Press Standby button switch
standby led blue light?
YES
change PSU board
Check LEDBright Control signal
YES
standby led turn off?
standby led red light?
YES
NO
red light
YES Check Q702 Q706 circuit
Change FPP board,MDC board
Check LEDBright Control signal
Check Q701Q706 circuit
Change UCD102 MODULE
Finish
Apply 1khz sinewave to RCA input of DUT
Amplifier output correct?
YES
NO IPRC IPRH signal correct?
YES
Change UCD102 MODULE
check+/-15V,+/-7.5VRight?
NO checkU461 U463 U464 U465 Circuit
NO change MAIN board
YES
checkU103 U104 U110 Circuit
change MAIN board
C368 Trouble shooting
