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CINEMA BASE (serv.man2) - JBL Audio Service Manual (repair manual). Page 23

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Keys does not 
work
go
Check whether CON203 
20pin cable broken or 
loss
Yes
Replace or reconnect 
key cable
KEYS DOES NOT WORK
Check whether  have 
+5V_STB and 
+3.3V_STB
No
Yes
Replace key board
Check DC/DC(U456) 
and LDO U455 circuit 
No
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