Read JBL BD 100 (serv.man2) Service Manual online
No display on VFD, and buttons do not work
No
No
Yes
Yes
No display on VFD, and
buttons do not work
buttons do not work
Check every supply
voltage on main board is
voltage on main board is
normal
Check the connect line is OK
Correct connection
Replace U135 or VFD
Yes
NO
No
Check the front bo ard
signals VSTB ,VCLK,VD,
signals VSTB ,VCLK,VD,
(XP13:pin8,9,10)
1.Check the VFD board
whether bad solder exists on
U135 and pins of VFD,
2.Check whether the circuit
connected to
K135,K136,,K138,K151, S608
are broken.
whether bad solder exists on
U135 and pins of VFD,
2.Check whether the circuit
connected to
K135,K136,,K138,K151, S608
are broken.
Check Q207, Q208,
Q209,U1,U2,U3,U1
5 is fixed on the
Q209,U1,U2,U3,U1
5 is fixed on the
Fix it
Yes
Trouble shooting chart
5- 1
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