Sony KE-37XS910 / KE-42XS910 / KE-MX37A1 / KE-MX37N1 / KE-MX37S1 Service Manual ▷ View online
– 33 –
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)
1/8 of the screen height, is
displayed.
Abnormal (Screen does not
light)
Panel chassis
Replace panel
chassis
chassis
10
Horizontal bar
Bar width of 1/2 of the screen
height.
height.
Abnormal display
(Screen does not light)
Panel chassis
Y-SUS
X-SUS
Above boards
are connected.
Y-SUS
X-SUS
Above boards
are connected.
Refer to Chapter
4.6.3
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
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
heat run. After
judgment, replace
panel chassis
13
Twinkle
The entire screen momentarily
becomes brighter or darker.
becomes brighter or darker.
14
Flicker
The entire screen flickers
continuously.
continuously.
Poor
connector
contact
(CN2,3,21,31)
Connector / cable
re-connection or
Cable exchange
re-connection or
Cable exchange
15 Luminance
is
abnormal
Screen is too dark or too bright.
(Out of specifications)
(Out of specifications)
16 Chrominance
is abnormal
Colors cannot be displayed
correctly.
correctly.
LOGIC
Replace
LOGIC
board
17 Sync
is
disturbed
LOGIC
Replace
LOGIC
board
18 Picture
distorted
LOGIC
Replace
LOGIC
board
19 Steps
of
gradation are
skipped
skipped
Luminance linearity is poor.
LOGIC
Replace
LOGIC
board
20 Abnormal
sound
PSU
X-SUS
Y-SUS
(Core is
broken, or
transformer is
abnormal.)
X-SUS
Y-SUS
(Core is
broken, or
transformer is
abnormal.)
Locate cause of
abnormality from
listening and viewing.
Replace the cause of
problem.
abnormality from
listening and viewing.
Replace the cause of
problem.
ABCDEF
– 34 –
NO
Fault
contents
Fault status
Suspected
fault
location
Analysis procedure
and measure
21 Control
on
external
communication
is abnormal
communication
is abnormal
Contrast, color temperature
adjustment and
adjustment and
ϒ cannot be
changed.
LOGIC
Replace
LOGIC
board
– 35 –
4.6 PROBLEM ANALYSIS PROCEDURE
4.6.1
"The entire screen does not light.(Main power is turned off)” Problem analysis procedure
The entire screen does not light.
(Main power is turned off.)
PC for analysis
Connected?
Analysis using PC
Chapter 4.7
Turn on AC power.
PSU board
Vpr2 (3.3V)
PSU board is
defective.
Y
Y
N
N
Turn off the AC power.
Remove the following power connectors
(4 locations):
CN 23 (X-SUS）
CN 33 (Y-SUS)
CN 42 (ABUSR)
CN 52 (ABUSL)
Turn off AC power.
Connect CN 6 (LOGIC).
Turn on AC power
Remove CN6 (LOGIC)
PSU board
Vpr2 (3.3V) exists?
LOGIC board is
defective.
N
Y
Turn off the AC
power.
End of analysis
STANDBY power
supply has abnormality.
supply has abnormality.
STANDBY power supply
(MPU power supply)
system has short-circuit.
(MPU power supply)
system has short-circuit.
1
– 36 –
1
Y
X-SUS board is
defective.
Y-SUS board
CN33 (1)-(2) pins or
CN33 (7)-(5) pins
are shorted.
are shorted.
ABUSL board
CN52 (1)-(4) pins or
CN52 (5)-(7) pins
are shorted.
CN52 (5)-(7) pins
are shorted.
Y
Y
Remove SDM from the
following (2) connectors.*
CN 34
CN 35
Y-SUS board
CN33 (1)-(2) pins or
CN33 (7)-(5) pins
are shorted.
CN33 (7)-(5) pins
are shorted.
SDM is
defective
(Panel chassis
is defective.)
Y
Y-SUS board is
defective.
N
ADM is defective
(Panel chassis is
defective.)
ABUSL board is
defective.
End of analysis
N
Y
Switching circuit (power supply)
has a short-circuit.
has a short-circuit.
Switching circuit
(power supply) has
(power supply) has
SDM chip/Flexible shorted
ADM chip/Flexible shorted
Power supply circuit has a short-circuit.
* Refer to Chapter 5.3 for
SDM removal. procedure.
CN23
(3): Vcc
(4): GND
(6): GND
(8): Vs
(3): Vcc
(4): GND
(6): GND
(8): Vs
N
N
* Refer to Chapter 5.4
for ADM removal.
procedure.
ABUSL board
CN52 (1)-(4) pins or
CN52 (5)-(7) pins
are shorted.
CN52 (5)-(7) pins
are shorted.
CN33
(1): Vcc
(2): GND
(5): GND
(7): Vs
(1): Vcc
(2): GND
(5): GND
(7): Vs
CN52
(1): Va
(4) : GND
(5): GND
(7) : Vcc
(1): Va
(4) : GND
(5): GND
(7) : Vcc
X-SUS board
CN23 (3)-(4) pins or
CN23 (6)-(8) pins
are shorted.
Remove ADM from the
following (2) connectors.*
CN 53
CN 54
CN 55
CN 56
2
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