Sony KLV-26BX320 User manual

AZ2FMAZ2FM
CHASSISCHASSIS
Segment: P-2FSegment: P-2F
SERVICE MANUALSERVICE MANUAL
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LCD Digital Color TVLCD Digital Color TV

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KLV-26BX320KLV-26BX320
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MODEL LISTMODEL LIST
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WARNINGS AND CAUTIONSWARNINGS AND CAUTIONS
--
ENEN
GLGL
ISIS
HH
CAUTIONCAUTION
These servicing instructions are for use by These servicing instructions are for use by
qualified service personnel only.qualified service personnel only.
To reduce the risk of electric shock, do not perform any servicing other than that contained in the To reduce the risk of electric shock, do not perform any servicing other than that contained in the
operating instructions unless you are qualified to do so.operating instructions unless you are qualified to do so.
WARNING!!WARNING!!
An isolation transformer should be used during any An isolation transformer should be used during any
service to avoid possible shock hazard, because service to avoid possible shock hazard, because
of live chassis.of live chassis.
The chassis of this receiver is directly connected to the ac power line.The chassis of this receiver is directly connected to the ac power line.
CARRYING THE TVCARRYING THE TV
Be sure to follow these guidelines to protect your property and avoid causing serious injury.Be sure to follow these guidelines to protect your property and avoid causing serious injury.
••
Carry the TV Carry the TV
with an adequate numwith an adequate num
ber of people; largeber of people; large
r size TVsr size TVs
require two or require two or
more people.more people.
••
Correct hand placement while carrCorrect hand placement while carr
ying the TV is very imying the TV is very im
portant for safety and to avoid damages.portant for safety and to avoid damages.
SAFETY-RELATED COMPONENT WARNING!!SAFETY-RELATED COMPONENT WARNING!!
Components identified by shading and ! Components identified by shading and !
mark on the schematic diagrams, exploded views, and mark on the schematic diagrams, exploded views, and
in the parts list are in the parts list are
critical for safe operation. Replace these cocritical for safe operation. Replace these co
mponents with Sonymponents with Sony
parts whose part numberparts whose part number
s appear as shown in this ms appear as shown in this m
anual or in supplements published by anual or in supplements published by
Sony. Circuit adjustmSony. Circuit adjustm
ents that are critical for safe operaents that are critical for safe opera
tion are identified in this manual.tion are identified in this manual.
Follow these procedures whenever critical components are replaced or Follow these procedures whenever critical components are replaced or
improper operation is suspected.improper operation is suspected.

WARNINGS AND CAUTIONS
USE CAUTION WHEN HANDLING THE LCD PANEL
When repairing the LCD panel, be sure you are grounded by using a wrist band.
When repairing the LCD panel on the wall, the LCD panel must be secured using the 4 mounting holes on the rear cover.
1)
Do no
t pre
ss on t
he pa
nel o
r fra
me ed
ge to a
voi
d the r
isk o
f ele
ctr
ic sh
ock
.
2)
Do n
ot sc
rat
ch or
pre
ss o
n the
pan
el w
ith a
ny s
har
p obj
ect
s.
3)
Do no
t leav
e the
modu
le in
high t
emper
ature
s or
in are
as of
high
humi
dity
for a
n exte
nded p
eriod
of ti
me.
4)
Do
not
exp
ose
the
LCD
pan
el
to
dir
ect
sun
lig
ht.
5)
Avoid
contac
t wi
th w
ater.
It m
ay ca
use a
short
circu
it w
ithin
the m
odule.
6)
Disco
nnect t
he AC pow
er whe
n replac
ing the ba
cklight
(CCF
L) or in
verte
r circu
it. (Hi
gh volt
age occ
urs at th
e inver
ter circ
uit at
650Vr
ms.)
7)
Alw
ays
cle
an t
he L
CD
pan
el w
ith
a so
ft c
lot
h m
ate
ria
l.
8)
Use car
e when han
dling t
he wir
es or con
necto
rs of the i
nver
ter circ
uit. Da
magi
ng the wi
res ma
y cause a s
hort.
9)
Prote
ct t
he pa
nel f
rom
ESD
to av
oid d
amag
ing t
he el
ectro
nic c
ircui
t (C
-MO
S).
10)
It is recom
mended not
to exceed 1
hour of P
ower-On n
or Burn-in
period with
LCD pane
l face down
condition, in re
pair activity.

SAFETY CHECK-OUT
After correcting the original service problem,
perform the following safety checks before releasing the set to
the customer:
1. Check the area of your repair for unsoldered or poorly soldered connections. Check the entire board surface for solder splashes and bridges.
2. Check the interboard wiring to ens
ure that no wires are “pinched”
or touching high-wattage resis
tors.
3. Check that all control knobs, shields, cover
s, ground straps,
and mounting hardware have been replaced. Be
absolutely certain
that you have replaced all the insulators.
4. Look for unauthorized replacement parts, particularly transistors, that
were installed during a previous repair. Point
them out to the customer and
recommend their replacement.
5. Look for parts which,
though functioning, show obvious signs of deterioration. Point them out
to the customer and recommend their replacement.
6. Check the line cords for cracks and abrasion. Recommend the replacement of any such line cord to the customer.
7. Check the antenna terminals, metal trim, “metallized”
knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below.
8. For safety reasons, repair
ing the Power board and/or In
verter
board is prohibited.

SAFETY CHECK-OUT
Leakage Test
The AC leakage from any
exposed metal part to earth ground and from all
exposed metal parts to any
exposed
metal part having a return to chassis,
must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any
one of three methods.
1. A commercial leakage tester, such
as the Simpson 229 or
RCA WT-540A. Follow the manufacturers’
instructions to use these instructions.
2. A battery-operated AC milliampmeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a
resistor by means of a
VOM or battery-operated AC voltmeter. The
“limit”
indication is 0.75 V, so analog m
eters must have an accu
rate low voltage scale.
The Simpson’s 250 and Sanwa SH-63TRD are examples of passive VOMs that are suitable. Nearly all
battery-operated digita
l multimeters that have
a 2 VAC range are suitable (see Figure A).
How to Find a Good Earth Ground
A cold-water pipe is a
guaranteed earth ground; the cover-plate retaining screw on most AC outlet
boxes is also
at earth ground.
If the retaining screw is
to be used as
your earth ground, verify that it is at
ground by measuring the resistance
between it and a cold-water pipe with an
ohmmeter. The reading shou
ld be zero ohms.
If a cold-water p
ipe is not acce
ssible, connect a 60-
to 100-watt tr
ouble-
light (not a n
eon lamp) between
the hot
side of the receptacle and the retaining screw. Try both slots, if necessary, to locate the hot side on the line; the
lamp should light at nor
mal brilliance if the
screw is at ground
potential (see Figure B).

SELF DIAGNOSIS FUNCTION
DIAGNOSTIC TEST INDICATORS
When an error occurs, the STANDBY L
ED will flash a set number of
times to
indicate the possible cause of the problem.
If there is more than one err
or, the LED will identify t
he first
of the problem areas.
Result for all of the
following diagnostic items are displayed on screen.
If the screen displays a “0”, no error has occurred .
The units in this manual
contain a self-diagnostic function. If an error
occurs, the STANDBY LED will automatically begin to flash.
The number of times the LED flashes translates to
a probable source of the
problem.
A definition of the STANDBY LED flash indicators is listed in the
instruction manual for the user’s knowledge and
reference.
If an error symptom cannot be reproduced,
the remote commander can be used
to review the failure occurrence data
stored in memory to reveal past
problems and how often these
problems occur.
STBY LED
F
lash tim
e
Service menu Item name
(Scree
en Dsisplay
)
Di
agnostic Item
Description
6
I
n
v
e
r
t
e
r
_
E
R
R
When The connection to the Inverter board
is
not proper, or the inv
erter board has
som
ething
wrong.("
Inv
erter_ERR")
8
A
U
P
R
O
T
When the connections of the speaker has
DC
level difference("AU PROT") Or M
ain
Am
p h
as
the O
ver Cu
rre
nt o
r H
ig
h
temperature s
tat
us
("A
m
p_ERR").

SELF DIAGNOSIS FUNCTION
DISPLAY OF STANDBY LED FLASH COUNT
SELF-DIAGNOS
TIC
SCREEN DISPLAY
For errors with
symptoms such as “pow
er sometimes shuts of
f”
or “screen sometimes goe
s out”
that cannot be confirmed, it is poss
ible to bring up past occurrences of f
ailure for
confirmation on the screen:
[To Bring Up Screen Test]
In standby mode, press buttons on
the remote commander sequentially in rapid succession as
shown below:
Note: The screen display of S
ELF-DIA
GNOSIC S
CREEN DIS
PLAY confirm
s from factory m
enu.
[How to use the remote commander]
<
>
/
<
>
Data change
<
>
/
<
>
Menu up/down
<Display>
<5><Vol
Up><Power
>
Factory mode on
The flow of control
Function
6 times
8 times
LED
ON
sec.
LED
OFF
sec.
LED OFF
 sec.
[ FLASH COUNT ]
0.3
0.3
2
5
D
I
S
P
L
A
Y
T
V
P
O
W
E
R
C
h
a
n
n
e
l
V
o
l
u
m
e

SELF DIAGNOSIS FUNCTION
[SELF DIAGNOSTIC SCREEN DISPLAY]
a)
Press
/
to
select
“SELF
DIAGNOSIS”.
b) Press
to enter the menu.
c)
Press
to
returned
“FACTORY
MENU”.
WHITE BALANCE
COLOR TEMP
SELF DIAGNOSIS
ADC ADJ
AGING MODE
FACTORY RESET
EDID WP
RECALL DATA
PANEL INDEX
RANGE SCAN
SAVE
SERVICE MODE
INPUT SOURCE
FACTORY MENU
>>
>>
>>
>>
OFF
OFF
ON
OFF
WXGA CMO26
OFF
OFF
>>
ATV
:MENU
AUDIO ERROR
INVERTER ERROR
BACK
SELF DIAGNOSIS
0
0
<<
:MENU
[Exiting the Self-diagnostic screen]
To exit the Self Diagnostic screen, turn off the power to the TV
by pressing the POWER button on the remote or the POWER button
on the TV.