Sony BKM-V12, Руководство по обслуживанию

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2-11
PFM-42X1/42X1N
8. The screen shows one or several vertical lines
1) This is not the problem of the controller B/D or XB/D.
2) It may be due to following reasons.
. The panel has a failure.
. The DATA COF FPC that is attached to the panel is
open or shorted.
.
The DATA COF that is attached to the panel has a
failure.
3) Replace the module.
Screen display form
9. The screen has one or several horizontal lines
1) This is not the problem of the controller B/D or XB/D.
2) It may be due to one of the following reasons.
.
The panel has a failure.
.
The SCAN FPC that is attached to the panel is open
or shorted.
.
The SCAN IC that is attached to the panel has a
failure.
3) Replace the Y DRV B/D
Screen display form
10. The screen displays an input signal pattern
but the brightness is low
1) In this case, the Z B/D operation has a failure.
2) Check the power cable of the Z B/D.
3) Check the connector that connects the Z B/D and
controller B/D.
4) Replace the controller B/D or Z B/D.
Several vertical lines appear
i n t h e q u a r t e r o r a n o t h e r
portion of the screen as the
case shown on the left.
Several horizontal lines may
appear as the case shown on
the left.
11. Another color may appear partially in the full
white screen, or a signal appears on the full
black screen
1) Check the inclination of the waveform at the Y B/D
setup, and reduce the waveform.
2) Check the inclination of the Z B/D ramp wave.
3) Measure each output waveform with the oscilloscope
(200 MHz or more) and compare the data with the data
shown in the following figure.
Adjust the Y B/D setup (Test-up : B/C[
µ
s/
µ
s]),
setdown (Test-down : D[
µ
s]) and Z B/D ramp (Tramp
: F/G[
µ
s/
µ
s]) inclination by changing VR1/VR2/VR3.
. Measuring point of the Y B/D : B50 (SUS_UP)
.
Measuring point of the Z B/D : B35 (SUS_OUT)
12. A center of the screen is darker than the
edges at full white pattern
1) The Z B/D has a failure.
2) Check the connection cable between the Z B/D and
CTRL B/D.
3) Replace the Z B/D.
Screen display form
13. A specific color does not have a specific
brightness.
1) Check the connector of the CTRL B/D input signal.
2) Replace the CTRL B/D.
10
±
5
u
s
120 ± 5 u s
_ Vy: 175 ± 1 V
Vzb: 105 ± 1 V
140 u s
33 ± 5 u s
Vset-up = Vs
Vsc: 110 ± 1 V
Vs