Trouble Shooting Charts - Harman Kardon BDP 1/120 Service Manual

harman/kardon
No display on VFD, and buttons do not work
No display on VFD, and
buttons do not work
Check
voltage on main board is
normal
Check-28V,5V,+12V
voltage on the power
and front board
Check the front board
signal
VSTB
1.Check whether bad solder exists
on U2 and pins of VFD,
2.Check
connected to K7, K2, K3, K4, K5,
K6 is broken.
Yes
every supply
Yes
Yes
VDIN,VCLK,
Yes
whether the circuit
Yes
Replace U3
No
Refer to Power supply board part
No
Fix the connection XP1 on front board
and CN502 on power board
No
Check the U3's pin 45,46,47 singal
No
Correct connection
26
BDP 1 / BDP 10 Service Manual
Trouble shooting chart