Hitachi P50A202/D8UF, Руководство по обслуживанию

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4.5 Fault Symptom
No
Fault contents Fault status
Suspected fault
location
Analysis procedure
and measure
1
Replace defective PCB
2
LOGIC
Replace
LOGIC board
3
PANEL
LOGIC
4
Replace Panel
5
multiplication width of screen.
PANEL
ABUS-A/B/C
LOGIC
And related connection
6
Vertical bar with 1/2 width of
screen
ABUS-A/B/C
LOGIC
And related connection
7 Single Horizontal line (Does not
light) or Single Horizontal line
does not light in entire screen
Exchange Panel
8
Every other lines do not light in
entire screen
X-SUS
Y-SUS
SDRU and D
Exchange SDR-U or SDR-D
9
Bar width of 1/8 of vertical size of
the screen does not light
SDR-U or D
10 Bar width of 1/2 vertical size of
the screen does not light.
SDRU or SDRD
Y or X-SUS
And related connections.
11
12
13 The entire screen flickers continuously
14
15
16
LOGIC
Exchange LOGIC
17
18
Luminance linearity is poor.
19
20
126
TROUBLESHOOTING THE PANEL
Make sure connector
from SDR to Panel is
correctly seated.
Make sure connector from
SDR to Panel
is correctly seated.
After momentarily lighting, the
light (No Picture)
screen becomes black
immediately or after a few
seconds.
(Main power is turned off.)
Screen does not show any
picture but lights dimly.
Entire screen does not
Single vertical line
Vertical line from middle of
Screen. Vertical line of
Different Color
Vertical Line
Vertical Bar
Horizontal Line
Horizontal Bar
Image sticking
(or Image retentions)
Twinkle
Flicker
Luminance is abnormal
Crominance is abnormal
Sync is disturbed
Picture is Distorted
Some steps of gradation
are skipped
Abnormal Noise
Control of external
communication is
abnormal.
unable to adjust Contrast, Chrominance
and gamma value.
LOGIC
Exchange LOGIC PWB
LOGIC
Exchange LOGIC
POWER SUPPLY,
Find defective part by
watching and hearing, after
replace defective part.
X or Y-SUS, Cabinet
Luminance can not be displayed correctly
LOGIC
Exchange LOGIC
Colors can not be displayed correctly
LOGIC
Exchange LOGIC
The entire screen momentarily becomes
brighter or darker.
Loose contact on
Connector
Loose contact on
Connector
Re-Connect cables
or replace defective cables
Lower Contrast & Brightness
Set Image Power to MID
Perform Screen Wipe
LOGIC
Text or Graphics
of any kind.
Fixed contents are always visible Fixed contents are always visible
Could be Top or Bottom.
May be Bottom
May be Top
See Vertical Line
Troubleshooting Flowchart
See Vertical Line
Troubleshooting Flowchart
See "No Picture"
Troubleshooting Flowchart
There is an image, but it is not normal.
Syncronization is abnormal
Unusual Noise coming from inside the set.
Exchange SDR board
Vertical bar with 1/15 or its
Exchange X-SUS or Y-SUS
See Vertical Bar
Troubleshooting Flowchart
See Horizontal Bar
Troubleshooting Flowchart
Pg. 2 7
See Troubleshooting
Pg. 2
7
1/2 Line = Panel
Some Panel Noise is Normal
In some cases, residual
images may remain after
the short term display of
still images when the
picture changes. NORMAL
Full line, check SDR
connector to Panel.
Any line short of full
on LVDS connector on
Logic PWB
Exchange LOGIC
If connection ok.