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SB 350 (serv.man4) - JBL Audio Service Manual (repair manual). Page 12

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