Read JBL SB 350 Service Manual online
NO POWER
SUPPLY
go
Check main
boardwhether have
19V on CON450
Check whether have
+5V_STB
Yes
No
Check power board
whether have 19V on
CON2
Yes
Replace power
board
Replace DC
cable
No
No
Check DC/DC(U456)
circuit
Check whether have
+3.3V_STB
Yes
Replace key board
cable
No
Check LDO U455
Yes
NO POWER SUPPLY
SB350 TROUBLESHOOTING CHARTS
Click on the first or last page to see other SB 350 service manuals if exist.