Pioneer KURO PDP-LX508D, Service Manual

Page: 49 / 175

PDP-LX5080D
49
5 6 7 8
5 6
7
8
C
D
F
A
B
E
No
Y DRIVE Assy
Is the waveform normal when the
voltage is applied to the panel?
(See the oscilloscope photos.)
Are all the connectors properly
connected?
Reconnect the connectors.
No
Set the VH voltage correctly.
X DRIVE Assy
Y DRIVE Assy / SCAN A, B, C, D
Assys
ADDRESS Assy
Abnormality across the whole
screen, such as luminescent spots
B
D
C
NG Yes
No
Set the VSNOFS voltage correctly.
NG
Is the VH set voltage (130 V)
correctly set?
Yes
Is the VSNOFS set voltage correctly
set (set value: designated for each panel)?
No
No
Another Assy may be in failure.
Set the VYRST voltage correctly.
No
Replace the FFC cables.
Replace the DIGITAL Assy.
Replace the Y DRIVE Assy.
Replace the SCAN IC.
NG
NG
Yes
Yes
Yes
Yes
No
Set the VKNOFS1, 2 voltage correctly.
Is the VKNOFS1, 2 set voltage
correctly set?
NG Yes
No
Set the VKNOFS3 voltage correctly.
Is the VKNOFS3 set voltage correctly
set (set value: designated for each panel)?
NG
NG
Yes
Yes
No
Set the VKNOFS 4voltage correctly.
Is the VKNOFS4 set voltage correctly
set (set value: designated for each panel)?
NG
Yes
Is the VYRST set voltage correctly
set (set value: designated for each panel)?
Is the input signal normal?
(See the oscilloscope photos.)
No
Is the waveform of the control
signal from the SCAN Assy normal?
(See the oscilloscope photos.)
Failure analysis for the
drive system => DR2
Because it is difficult to identify which drive is in failure, follow the flowchart below to check each Assy.