Harman Kardon BDS 280 (serv.man6) Service Manual ▷ View 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+5V,+12V,VCC_D
voltage on the power and
Main board and 38V on
FB Board
voltage on the power and
Main board and 38V on
FB Board
Refer to Power supply board part
No
Fix the co nnection XP4 on Main b oard
and CON50 3 on po wer board, and
24pin FFC cable from FB to Main board
and CON50 3 on po wer board, and
24pin FFC cable from FB to Main board
No
Check the U701 pin 31,32,34 arrive the
condition XP504 13,1 2,11
condition XP504 13,1 2,11
No
Yes
Yes
Check the front bo ard
signals
signals
VDIN,VCLK,
VSTB
1.Check
whether
bad
solder exists on pi ns of
VFD,
VFD,
Correct connection
No
Yes
Replace VFD or FB
Harman Kardon
BDS 280 + 580 Service Manual
Page 25 of 87
5-3 Trouble shooting Chart
Remote control does not work
Remote control
does not work
does not work
Go
Check whether the remote
controller’s
controller’s
battery
is
exhausted or not.
No
Replace the battery for remote
controller
controller
Check the 24pin FFC cable
from FB to Main board is
connect well
from FB to Main board is
connect well
Yes
Reconnect the cable
No
Yes
Replace IR501
Check the IR50 1 power
supply is OK, IR501 pin3 is
about 3.3V
supply is OK, IR501 pin3 is
about 3.3V
Check the +3.3V net on front board
No
Yes
Harman Kardon
BDS 280 + 580 Service Manual
Page 26 of 87
5-4 Trouble shooting Chart
Can’t read disc or can’t eject
Yes
Check the co nnection 5pin cable from the
BD board
BD board
Can’t read disc or can’t
eject
eject
Check 45pin and 5pin/9pin
cable from Main board
connection to the l oader is
normal
cable from Main board
connection to the l oader is
normal
Replace the Main board
NO
GO
Check whether the
DVD loader running is
normal
DVD loader running is
normal
Fix the c onnection the 45pin cable
and 5pin/9pin cable
and 5pin/9pin cable
NO
Yes
Harman Kardon
BDS 280 + 580 Service Manual
Page 27 of 87
5-5 Trouble shooting Chart
5.1/2.1 channel no audio output
Reconnect well
check the system weather is
headphone mode or not, pul l
out the 6pin cable XP26 from
USB to Main board
headphone mode or not, pul l
out the 6pin cable XP26 from
USB to Main board
Replace the USB board
Yes
No
Go
Check the 10pin/4pin cable is
connect well from Main board to
AV board
connect well from Main board to
AV board
5.1/2.1 channel no audio
output
output
Yes
Replace the Main board
No
Check +32V at XP27 on
Main board is OK
Main board is OK
Yes
Refer to Power supply board
Check XP27 is short to
GND
No
Replace the Main board
Yes
No
Harman Kardon
BDS 280 + 580 Service Manual
Page 28 of 87
Click on the first or last page to see other BDS 280 (serv.man6) service manuals if exist.