BDS 580S (serv.man2) - Harman Kardon Audio Service Manual (repair manual). Page 14

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5-2                             Trouble shooting Chart 
No display on VFD 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
No display on VFD   
Go 
Check every supply 
voltage on Main board is 
normal 
Yes 
Check+5V,+12V,VCC_D 
voltage on the power and 
Main board and 38V on 
FB Board 
Refer to Power supply board part
 
No
Fix the connection XP4 on Main board  
and  CON503 on power board, and 
24pin FFC cable from FB to Main board
 
No
Check the U701 pin 31,32,34 arrive the 
condition XP504  13,12,11 
No
Yes 
Yes 
Check the front board 
signals VDIN,VCLK, 
VSTB 
1.Check whether bad 
solder exists on  pins of 
VFD,  
 
Correct connection   
No
Yes 
Replace VFD or FB 
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