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TROUBLESHOOTING THE 50AF1 PANEL
4.5 Fault Symptom
Fault contents
No
1
Entire screen does not
light (No Picture)
2
3
Vertical Line
4
5
Vertical Bar
6
7
Horizontal Line
8
9
Horizontal Bar
10
11
Image sticking
(or Image retentions)
Twinkle
12
13
Flicker
Luminance is abnormal
14
15
Crominance is abnormal
16
Sync is disturbed
Picture is Distorted
17
Some steps of gradation
18
are skipped
Abnormal Sound
19
Control of external
20
communication is
abnormal.
Fault status
After momentarily lighting, the
screen becomes black
immediately or after a few
seconds.
(Main power is turned off.)
Screen does not show any
picture but lights dimly.
Single vertical line
Vertical line from middle of
Screen. Vertical line of
Different Color
Vertical bar with 1/15 or its
multiplication width of screen.
Vertical bar with 1/2
width of screen.
Single Horizontal line (Does not
light) or Single Horizontal line
does not light in entire screen
Every other lines do not light in
entire screen
Bar width of 1/8 of vertical size of
the screen does not light
Bar width of 1/2 vertical size of
the screen does not light.
Could be Top or Bottom.
Fixed contents are always visible
The entire screen momentarily becomes
brighter or darker.
The entire screen flickers continuously
Luminance linearity is poor
Colors can not be displayed correctly
Syncronization is abnormal
There is an image, but it is not normal.
Luminance linearity is poor.
Unusual Sound coming from inside the set.
It is unable to adjust Contrast, Chrominance
and gamma value.
Suspected fault
X-SUS, Y-SUS
PSU, Panel, LOGIC
ABUS-A, B, C
SDRU and SDRD
LOGIC
PANEL
LOGIC
PANEL
Logic PWB
PANEL
ABUS-A, B, C
LOGIC
And related connection
ABUS-A, B, C
LOGIC
And related connection
Make sure connector at
location from SDR
is correctly seated.
If connector OK, Panel
X-SUS
Y-SUS
Make sure connector at
location from SDR
is correctly seated.
SDR-U or D
Panel, SDRU and D
May be Top
Y or X-SUS
And related
May be Bottom
connections
Text or Graphics
PANEL
of any kind.
Loose contact on
CN01 Connector
LOGIC PWB
Connector
LOGIC
LOGIC
LOGIC
PANEL
LOGIC
POWER SUPPLY,
X or Y-SUS, Cabinet
LOGIC
36
Analysis procedure
location
and measure
Replace defective PCB
See "No Picture"
Troubleshooting Flowchart
Replace Logic PWB
See Vertical Line
Troubleshooting Flowchart
Panel Failure
Replace Logic PWB
See Vertical Line
Troubleshooting Flowchart
See Vertical Bar
Troubleshooting Flowchart
Panel Failure
Exchange X-SUS or Y-SUS
Exchange SDR board
See Horizontal Bar
Troubleshooting Flowchart
Judge after operation test
on full white display,
Replace Panel
Re-Connect cables
or replace defective cables
Replace Logic PWB
Replace Logic PWB
Replace Logic PWB
Panel Failure
Replace Logic PWB
Find defective part by
watching and hearing, after
replace defective part.
Replace Logic PWB
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