Pioneer BDP-LX55 - Troubleshooting Display and Button Issues

18
BDP-LX55
1
2 3 4
A
B
C
D
E
F
1
2 3 4
5. DIAGNOSIS
5.1 DIAGNOSIS FLOWCHART
1) No display on VFD, and buttons do not work
No
No
Yes
Yes
No display on VFD, and
buttons do not work
Check every supply
voltage on MAIN BOARD ASSY
Check the connect line is OK
Correct connection
Replace SW1, SW2,
and SW3,
Yes
No
No
Check the FRONT BOARD
ASSY signals VCLK,VD, VSTB,
(XS135:pin3,4,5)
Check whether the circuit
connected to SW1, SW2 and
SW3 are broken.
Check Q15,Q206 and Q214
is fixed on the
MAIN BOARD ASSY
Yes
is normal
Fix it