Read Harman Kardon BDS 535 Service Manual online
5-2 Trouble shooting Chart
No display on VFD
No display on VFD
Go
Check every supply
voltage on Main board is
normal
voltage on Main board is
normal
Yes
Check+34V,+12V,VCC_
D voltage on the power
and Main board and 38V
on FV Board
D voltage on the power
and Main board and 38V
on FV Board
Refer to Power supply board part
No
Fix the connection XP607 on Main board
and CON501 on power board, and
30pin FFC cable from FV to Main board
No
Check the U702 pin 31,32,34 arrive the
condition XP15 pin 25,24,23
No
Yes
Yes
Check the front board
signals VFD_DA,
VFD_CLK, VFD_STB
1.Check whether bad
solder exists on pins of
VFD,
solder exists on pins of
VFD,
Correct connection
No
Yes
Replace VFD or FV board
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