Sony KE-42TS2E / KE-42TS2U Service Manual ▷ View online
26
4.4
Operation Test Procedure
(1) Prepare the test equipment and the module requested for repair.
(2) Affix to the stand (jig) the module requested for repair.
(3) Connect LOGIC board connector CN1 of the module to the
Interface board (jig)CN5 with the dedicated signal cable.
(5) Turn on the AC power to the interface board (jig).
(7) Set the PDP go switch on the Interface board (jig) to ON.
(The main power of the module is turned on.)
Check Fault Symptom
(6) Select the signal used when a problem occurs, or an all white
(4) Connect the AC power cable to CN61 on the PSU board of the
module requested for repair.
PDP go Switch
ON
OFF
CN1
CN5
27
4.5 Fault
Symptom
NO
Fault
contents
Fault status
Suspected
fault
location
Analysis
procedure
and measure
1
After momentarily going
on, the screen becomes
black immediately or after a
few seconds. (Main power
is turned off.)
on, the screen becomes
black immediately or after a
few seconds. (Main power
is turned off.)
X-SUS
Y-SUS
PSU
Panel chassis
LOGIC
ABUSL
ABUSR
Refer to
Chapter
4.6.1
2
Entire
screen
does not
light.
screen
does not
light.
Screen lights dimly even on
the back screen.
the back screen.
LOGIC Replace
LOGIC
board
3
Single vertical line (of
different color)
different color)
Panel chassis
LOGIC
Refer to
Chapter
4.6.2
4
Vertical
line
line
Vertical line from the
middle of effective scan
area (Vertical line of
different color)
middle of effective scan
area (Vertical line of
different color)
Panel chassis
Replace
panel
chassis
5
Bar width of 1/7 of
horizontal size or in
multiples of 1/7, is
displayed. Abnormal
display.
horizontal size or in
multiples of 1/7, is
displayed. Abnormal
display.
Panel chassis
ABUSL
ABUSR
LOGIC
Above boards are
connected
.
Refer to
Chapter
4.6.2
6
Vertical
bar
bar
Bar width of 3/7 or 4/7 of
the screen width, is
displayed. Abnormal
display. (Vertical line of
different color)
the screen width, is
displayed. Abnormal
display. (Vertical line of
different color)
ABUSL
ABUSR
LOGIC
Above boards are
connected.
Refer to
Chapter
4.6.2
7
Single horizontal line (No
light) or single horizontal
line does not light among
the effective scanning area.
Single horizontal line does
not light.
light) or single horizontal
line does not light among
the effective scanning area.
Single horizontal line does
not light.
Panel chassis
Replace
panel
chassis
8
Horizontal
line
line
Every other line(No light)
Entire screen
Entire screen
X-SUS
Y-SUS
Replace
X-SUS
Y-SUS
board
28
NO Fault
contents
Fault status
Suspected
fault
location
Analysis
procedure
and measure
9
Bar width of 1/8 or
multiples of 1/8 of the
screen height, is displayed.
Abnormal (Screen does not
light)
multiples of 1/8 of the
screen height, is displayed.
Abnormal (Screen does not
light)
Panel chassis
Replace
panel
chassis
10
Horizontal
bar
bar
Bar width of 1/2 of the
screen height.
Abnormal display
(Screen does not light)
screen height.
Abnormal display
(Screen does not light)
Panel chassis
Y-SUS
X-SUS
Above boards are
connected.
Refer to
Chapter
4.6.3
11 Image
sticking
Fixed display contents are
always displayed.
always displayed.
Panel chassis Perform all
white heat
run. After
judgment,
replace
panel
chassis
12 Stains
Oval-shaped points having
abnormal luminance are
scattered in the upper or
lower part of screen.
abnormal luminance are
scattered in the upper or
lower part of screen.
Panel chassis Perform all
white heat
run. After
judgment,
replace
panel
chassis
panel
chassis
13 Twinkle
The entire screen
momentarily becomes
brighter or darker.
momentarily becomes
brighter or darker.
14 Flicker
The entire screen flickers
continuously.
continuously.
Poor
connector
contact
（
CN2,3,21,31）
connector /
cable re-co
nnection or
Cable exc
hange
15 Luminanc
e is abnor
mal
mal
Screen is too dark or too
bright. (Out of
specifications)
bright. (Out of
specifications)
16 Chromina
nce is ab
normal
normal
Colors cannot be displayed
correctly.
correctly.
LOGIC Replace
LOGIC
board
ABCDEF
29
17 Sync
is
disturbed
LOGIC Replace
LOGIC
board
18 Picture
distorted
LOGIC Replace
LOGIC
board
19 Steps of
gradatio
n are
skipped
n are
skipped
Luminance linearity is poor.
LOGIC Replace
LOGIC
board
20 Abnormal
sound
PSU
X-SUS
Y-SUS
(Core is broken,
or transformer is
abnormal.)
Locate cause
of
abnormality
from
listening and
viewing.
Replace the
cause of
problem.
21 Control
on
external
communic
ation is
abnormal
communic
ation is
abnormal
Contrast, color temperature
adjustment and
adjustment and
ϒ cannot be
changed.
LOGIC
Replace
LOGIC
board
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