Sony Bravia KDL-40NX720 User manual

LCD DIGITAL COLOR TV
SERVICE MANUAL AZ2-F CHASSIS
MODEL COMMANDER DESTINATION
9-888-386-53
KDL-40NX720 RM-YD069 MX/LA
KDL-46NX720 RM-YD069 MX/LA
KDL-46NX720 RM-YD059 US/CND
KDL-55NX720 RM-YD069 MX/LA
KDL-55NX720 RM-YD059 US/CND
KDL-60NX720 RM-YD059 US/CND
LEVEL 3
HISTORY INFORMATION FOR THE FOLLOWING MANUAL:
ELECTRICAL SERVICE MANUAL
ORIGINAL MANUAL ISSUE DATE: 3/2011
REVISION DATE SUBJECT
3/4/2011 Original Manual Release Date.
11/9/2011 Added Accessories and Packing to Electrical Parts List. Replaced pages 59-60.
1/25/2012 Added Warnings and Caution information.
Added Safety-Related Warning information.
Updated Safety Check-Out information. Reissue entire manual.

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KDL-40NX720/46NX720/55NX720/60NX720
KDL-40NX720/46NX720/55NX720/60NX720
TABLE OF CONTENTS
SECTION TITLE PAGE
Warnings and Cautions ....................................................................................................................................................................................................3
Safety-Related Warning ....................................................................................................................................................................................................4
Safety Check-Out...............................................................................................................................................................................................................5
SECTION 1: DIAGRAMS...................................................................................................................................................................................................7
1-1. Circuit Boards Location ...................................................................................................................................................................................... 7
1-2. Printed Wiring Boards and Schematic Diagrams Information ............................................................................................................................ 9
1-3. Block Diagrams ................................................................................................................................................................................................ 11
1-4. Connector Diagrams ........................................................................................................................................................................................13
1-5. Schematics and Supporting Information ..........................................................................................................................................................19
BATL Board Schematic Diagram (1 of 12) .......................................................................................................................................................19
BATL Board Schematic Diagram (2 of 12) .......................................................................................................................................................20
BATL Board Schematic Diagram (3 of 12) .......................................................................................................................................................21
BATL Board Schematic Diagram (4 of 12) .......................................................................................................................................................22
BATL Board Schematic Diagram (5 of 12) .......................................................................................................................................................23
BATL Board Schematic Diagram (6 of 12) .......................................................................................................................................................24
BATL Board Schematic Diagram (7 of 12) .......................................................................................................................................................25
BATL Board Schematic Diagram (8 of 12) .......................................................................................................................................................26
BATL Board Schematic Diagram (9 of 12) .......................................................................................................................................................27
BATL Board Schematic Diagram (10 of 12) .....................................................................................................................................................28
BATL Board Schematic Diagram (11 of 12) .....................................................................................................................................................29
BATL Board Schematic Diagram (12 of 12) .....................................................................................................................................................30
G4 Board Schematic Diagram (KDL-40NX720 Only) (Page 1 of 2)................................................................................................................. 33
G4 Board Schematic Diagram (KDL-40NX720 Only) (Page 2 of 2)................................................................................................................. 34
G5 Board Schematic Diagram (KDL-46NX720 Only) (Page 1 of 2)................................................................................................................. 36
G5 Board Schematic Diagram (KDL-46NX720 Only) (Page 2 of 2)................................................................................................................. 37
G6 Board Schematic Diagram (KDL-55NX720/60NX720 Only) ...................................................................................................................... 39
G7 Board Schematic Diagram (KDL-55NX720/60NX720 Only) ...................................................................................................................... 41
HEM2 Board Schematic Diagram ....................................................................................................................................................................43
HLT2 Board Schematic Diagram...................................................................................................................................................................... 45
LD Board Schematic Diagram (KDL-40NX720 Only)....................................................................................................................................... 47
SECTION 2: ELECTRICAL PARTS LIST........................................................................................................................................................................49
APPENDIX A: ENCRYPTION KEY COMPONENTS..................................................................................................................................................... A-1

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KDL-40NX720/46NX720/55NX720/60NX720
KDL-40NX720/46NX720/55NX720/60NX720
WARNINGS AND CAUTIONS
CAUTION
These servicing instructions are for use by qualied service personnel only. To reduce the risk of electric shock, do not perform any
servicing other than that contained in the operating instructions unless you are qualied to do so.
WARNING!!
An isolation transformer should be used during any service to avoid possible shock hazard, in case of live chassis.
! SAFETY-RELATED COMPONENT WARNING!!
There are critical components used in LCD color TVs that are important for safety. These components are identied with shading and
! mark on the schematic diagrams and the electrical parts list. It is essential that these critical parts be replaced only with the part
number specied in the electrical parts list to prevent electric shock, re, or other hazard.
NOTE: Do not modify the original design without obtaining written permission from the manufacturer or you will void the original parts
and labor warranty.
CARRYING THE TV
• Disconnect all cables when carrying the TV.
• Carry the TV with the adequate number of people; larger size TVs require two or more people.
• Correct hand placement while carrying the TV is very important for safety and to avoid damage.
ATTENTION!!
Ces instructions de service sont à l’usage du personnel de service qualié seulement. Pour prévenir le risque de choc électrique, ne
pas faire l’entretien autre que celui contenu dans le Mode d’emploi à moins que vous soyez qualié faire ainsi.
ALERTE!!
An d’eviter tout risque d’electrocution provenant d’un chássis sous tension, un transformateur d’isolement doit etre utilisé lors de tout
dépannage.
! ATTENTION AUX COMPOSANTS RELATIFS A LA SECURITE!!
Il ya des composants essentiels utilisés dans les téléviseurs LCD couleur qui sont importants pour la sécurité. Ces composants sont
identiés à l’ombrage et ! marque sur les schémas et la liste des pièces électriques. Il est essentiel que ces parties critiques être
remplacé uniquement avec le numéro de pièce gurant dans la liste des pièces électriques pour éviter les chocs électriques, d’incendie
ou autre danger.
NOTE: Ne pas modier la version originale sans obtenir la permission écrite du fabricant ou que vous annulera les pièces d’origine
ainsi que la garantie du travail.
POUR TRANSPORTER LE TÉLÉVISEUR
• Débranchez tous les câbles avant de transporter le téléviseur.
• Transportez le téléviseur avec le nombre adéquat de personnes; téléviseur de grande taille nécessitent deux personnes ou plus.
• Lors du transport du téléviseur, le bon emplacement des mains est très important pour votre sécurité, ainsi que pour éviter de
causer des dommages.

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KDL-40NX720/46NX720/55NX720/60NX720
KDL-40NX720/46NX720/55NX720/60NX720
SAFETY-RELATED WARNING
8) Use care when handling the wires or connectors
of the inverter circuit. Damaging the wires may
cause a short.
9) Protect the panel from ESD to avoid damaging
the electronic circuit (C-MOS).
10) During the repair, DO NOT leave the Power On
for more than 1 hour while the TV is face down
on a cloth.
FAITES ATTENTION LORS DE LA MANIPULATION DE L’ÉCRAN ACL
Au moment de réparer l’écran ACL, assurez-vous d’être mis à la terre à l’aide d’un bracelet à cet effet.
Au moment d’installer le panneau ACL sur un mur, il doit être maintenant en place à l’aide des 4 orices de xation présents
au couvercle arrière.
Pour éviter d’endommager l’écran LCD:
1) N’appuyez par sur le bord du panneau ou du cadre an d’éviter le risque de choc électrique.
2) Ne rayez pas ou n’appuyez pas sur le panneau avec des objets pointus.
3) Ne laissez pas le module exposé à des températures élevées ou dans des secteurs à haut niveau
d’humidité pour une période prolongée.
4) N’exposez pas le panneau ACL à l’ensoleillement direct.
5) Évitez le contact avec l’eau, car elle peut causer un court-circuit dans le module.
6) Déconnectez l’alimentation c.a. au moment de remplacer le rétroéclairage ou le circuit inverseur (Un
voltage élevé se produit dans le circuit inverseur à 650Vrms).
7) Nettoyez toujours le panneau ACL avec un chiffon doux.
8) Faites attention lors de la manipulation des
ls ou connecteurs du circuit inverseur. Le fait
d’endommager les lms peut causer un court-
circuit.
9) Protégez le panneau des décharges
électrostatiques an d’éviter d’endommager le
circuit électronique (C-MOS).
10) Pendant la réparation, NE LAISSEZ PAS
l’alimentation en fonction pendant plus de 1 heure
pendant que l’écran du téléviseur repose sur un
tissu.
USE CAUTION WHEN HANDLING THE LCD PANEL
When repairing the LCD panel, be sure you are grounded by using a wrist band.
When installing the LCD panel on a wall, the LCD panel must be secured using the 4 mounting holes on the rear cover.
To avoid damaging the LCD panel:
1) Do not press on the panel or frame edge to avoid the risk of electric shock.
2) Do not scratch or press on the panel with any sharp objects.
3) Do not leave the module in high temperatures or in areas of high humidity for an extended period of
time.
4) Do not expose the LCD panel to direct sunlight.
5) Avoid contact with water. It may cause a short circuit within the module.
6) Disconnect the AC power when replacing the backlight (CCFL) or inverter circuit.
(High voltage occurs at the inverter circuit at 650Vrms.)
7) Always clean the LCD panel with a soft cloth material.

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KDL-40NX720/46NX720/55NX720/60NX720
KDL-40NX720/46NX720/55NX720/60NX720
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 ensure that no wires are “pinched” or
touching high-wattage resistors.
3. Check that all control knobs, shields, covers, 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.
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. Follow the manufacturers’ instructions.
2. A battery-operated AC milliampmeter.
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 meters must have an accurate low voltage scale. Nearly all
battery-operated digital multimeters that have a 2 VAC range are
suitable. (see Figure A)
To Exposed Metal
Parts on Set
0.15 µF
Earth Ground
AC
Voltmeter
(0.75V)
Figure A. Use an AC voltmeter to check AC leakage.
HOW TO FIND A GOOD EARTH GROUND
The cover-plate retaining screw on most AC outlet boxes is at
earth ground. Verify the AC outlet box retaining screw ground
by connecting a 60-to 100-watt trouble-light (not a neon 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 normal brilliance if the screw is at ground
potential. (see Figure B)
Figure B. Checking for earth ground.
Trouble Light
AC Outlet Box

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KDL-40NX720/46NX720/55NX720/60NX720
KDL-40NX720/46NX720/55NX720/60NX720
Th
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Lead Free Solder. The boards are identified by the LF logo located
close to the board designation e.g. H1 etc [ see example ]. The
servicing of these boards requires special precautions to be taken as
outlined below.
example
It is strongly recommended to use Lead Free Solder material in order to guarantee optimal quality of new solder joints.
Lead Free Solder is available under the following part numbers :
Due to the higher melting point of Lead Free Solder the soldering iron tip temperature needs to be set to 370 degrees centigrade.
This requires soldering equipment capable of accurate temperature control coupled with a good heat recovery characteristics.
rebmuntraP retemaiD skrameR
91-500-046-7mm3.0gK52.0
02-500-046-7mm4.0gK05.0
12-500-046-7mm5.0gK05.0
22-500-046-7mm6.0gK52.0
32-500-046-7mm8.0gK00.1
42-500-046-7mm0.1gK00.1
52-500-046-7mm2.1gK00.1
62-500-046-7mm6.1gK00.1

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KDL-40NX720/46NX720/55NX720/60NX720
KDL-40NX720/46NX720/55NX720/60NX720
SECTION 1: DIAGRAMS
1-1. CIRCUIT BOARDS LOCATION
SWITCH
UNIT
CAMERA MODULEHEM2 HLT2
TCON
LD
G4 BATL
WIRELESS
LAN CARD
Figure 1-1. KDL-40NX720 ONLY
SWITCH
UNIT
CAMERA MODULEHEM2 HLT2
TCON
LD
G5 BATL
WIRELESS
LAN CARD
Figure 1-2. KDL-46NX720 ONLY

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KDL-40NX720/46NX720/55NX720/60NX720
KDL-40NX720/46NX720/55NX720/60NX720
Figure 1-3. KDL-55NX720 ONLY
SWITCH
UNIT
CAMERA MODULEHEM2 HLT2
TCON
G7
LD
G6 BATL
WIRELESS
LAN CARD
Figure 1-4. KDL-60NX720 ONLY
SWITCH
UNIT
CAMERA MODULEHEM2 HLT2
TCON
G7
LD
G6 BATL
WIRELESS
LAN CARD

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KDL-40NX720/46NX720/55NX720/60NX720
KDL-40NX720/46NX720/55NX720/60NX720
1-2. PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS INFORMATION
All capacitors are in µF unless otherwise noted. pF : µµF 50WV
or less are not indicated except for electrolytics and tantalums.
All electrolytics are in 50V unless otherwise specied.
All resistors are in ohms. kΩ=1000Ω, MΩ=1000kΩ
Indication of resistance, which does not have one for rating
electrical power, is as follows: Pitch : 5mm
Rating electrical power :
1/4 W
1/4 W in resistance, 1/10 W and 1/16 W in chip resistance.
: nonammable resistor
: fusible resistor
: internal component
: panel designation and adjustment for repair
: earth ground
: earth-chassis
All variable and adjustable resistors have characteristic curve B,
unless otherwise noted.
Readings are taken with a color-bar signal input.
Readings are taken with a 10MΩdigital multimeter.
Voltages are DC with respect to ground unless otherwise
noted.
Voltage variations may be noted due to normal production
tolerances.
All voltages are in V.
S : Measurement impossibility.
: B+line.
: B-line. (Actual measured value may be
different).
: signal path. (RF)
Circled numbers are waveform references.
The components identied by shading and
!
symbol are critical for safety. Replace
only with part number specied.
The symbol indicates a fast operating fuse and is displayed on the component
side of the board. Replace only with fuse of the same rating as marked.
Les composants identies per un trame et une marque
!
sont critiques pour la
securite. Ne les remplacer que par une piece portant le numero specie.
Le symbole indique une fusible a action rapide. Doit etre remplace par une
fusible de meme yaleur, comme maque.
NOTE: The components identied by a red outline and a mark contain condential
information. Specic instructions must be adhered to whenever these components
are repaired and/or replaced.
See Appendix A: Encryption Key Components in the back of this manual.

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KDL-40NX720/46NX720/55NX720/60NX720
KDL-40NX720/46NX720/55NX720/60NX720
G
D
S
B1 E1
C2
B2 C1E2
2
3
4
5
6
7
8
9
–
1
G
D
S
B2 E2C1
B1 C2
E1
B2 E2C1
B1 C2E1
B2 E2
C1
B1 C2E1
B1 E1
E2
C1(B2)C2
B1
E2
C1
C2
(B2)
E1
(B2)
E1
E2
B1
C2C1
B1
E1
C2
B2
C1
E2
G
SS
D
G
D
B1
E1
C2
B2
C1
E2
B1
E2
C2C1(B2)
E2
B1
C1
C2E1(B2)
C2
B1
C1
E2E1(B2)
C2
B1
C1
E2
B2
E1
C2
Ver.1.6
Transistor
(FET)
Transistor
Transistor
Transistor
Transistor
Transistor
Transistor
Transistor
Transistor
Transistor
Discrete semiconductor
(Chip semiconductors that are not actually used are included.)
Diode
Diode
Diode
Diode
Diode
Diode
Diode
Diode
Diode
Diode
Source
Source
Anode Anode
(NC)
(NC)
Cathode
Anode
Cathode
Common
Cathode Cathode
Common
Cathode Cathode
Common
Common
Common
Common
Cathode
Anode
Base Emitter
Collector
Base Emitter
Collector
Drain
Gate
Gate
Drain
Device Printed symbol Terminal name Circuit
Terminal name of semiconductors in silk screen
printed circuit ( )
Anode
Anode
Anode Cathode
Anode Anode
Cathode
Transistor
(FET)
Transistor
(FET)
Emitter
Collector
Base
Transistor
Source
Gate
Drain
Cathode
Anode
Anode Cathode
Anode
Anode
*
18
11
17
16
15
14
13
12
10
21
20
19
23
22
REFERENCE INFORMATION
RESISTOR
: RN METAL FILM
: RC SOLID
: FPRD NONFLAMMABLE CARBON
: FUSE NONFLAMMABLE FUSIBLE
: RW NONFLAMMABLE WIREWOUND
: RS NONFLAMMABLE METAL OXIDE
: RB NONFLAMMABLE CEMENT
: ADJUSTMENT RESISTOR
COIL
: LF-8L MICRO INDUCTOR
CAPACITOR
: TA TANTALUM
: PS STYROL
: PP POLYPROPYLENE
: PT MYLAR
: MPS METALIZED POLYESTER
: MPP METALIZED POLYPROPYLENE
: ALB BIPOLAR
: ALT HIGH TEMPERATURE
: ALR HIGH RIPPLE