Technical description and composition of the SONY KDL-46NX720 TV, panel type and applicable modules. The composition of the modules.SONY LED
Model: KDL-46NX720
Chassis / Version: AZ2-F
Panel: FDMY460LT01
T-CON: V460H1-CPE5; CPU CXD4730GB, CM505-80E1FU01 (TS2596CM505), RT8269, MX-25L8006E
LED driver (backlight): ST4055YL-S01 REV: 1.0
PWM LED driver: BD9276EFV, LM2904
Power Supply (PSU): APS-295 / W
PWM Power: MIP2H2, CXA3811M, CXA3812M, LM2904
MainBoard: 1-883-754-12 (Y2009470A-077287-REV101-SOFT3704)
IC MainBoard: CPU: CXD4727GB; NAND: TC58RYG1S8EBAIA; DDR3 K4B2G1646C-HCH9; Si19287BCNU; GL850G (MN1GD07G21); PS54425; BD95830; RTL8201ES; S24CS02A
Control: RM-ED044, WIFI: MDK 338V-0 W, IR: B62802-0815
Technical Specifications KDL-46NX720
SONY KDL-46NX720
General repair guidelines for TV LCD LED
If the TV does not turn on, no control lights are on or blinking, there are no sounds when you turn on, and there is not the slightest sign of operability - the most likely malfunction is in the power module. It is advisable to start the troubleshooting of the power supply module by checking the state of the electrolytic capacitors of the rectifier filters and the mains fuse. Defective capacitors should be replaced. If the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and transistors, which are often found in such a state of breakdown.
The reasons for the breakdown of the power switch in pulsed power supplies (IIPS) can be different, for example, a malfunction of semiconductor cells or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller MIP2H2, CXA3811M, CXA3812M, LM2904 or broken resistors in its harness.
If the SONY KDL-46NX720 does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction in the backlight LED circuit of the FDMY460LT01 panel, or their power converter - LED driver. Sometimes, when turned on, the image appears and immediately disappears. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the backlight unit.
The lack of backlight often occurs due to an open circuit in the LED circuit. There is a need for disassembling the panel and checking the LEDs themselves, as well as the same contact connections in the connectors and rations of the terminals.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software).
In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - CPU: CXD4727GB; NAND: TC58RYG1S8EBAIA; DDR3 K4B2G1646C-HCH9; Si19287BCNU; GL850G (MN1GD07G21); PS54425; BD95830; RTL8201ES; S24CS02A for new or obviously working. In cases where BGA technologies are used, defects are usually localized by the heating method.
It should be remembered! Attempts to repair the SONY KDL-46NX720 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
1. Service Manual with Schematic Diagram 62 pages of 2011 FOR the KDL-40NX720, KDL-46NX720, KDL-46NX720, KDL-55NX720, KDL-55NX720, KDL-60NX720.
SCHEMATICS MANUAL ------------> SONY CHASSIS AZ2-F - KDL-40NX720, KDL-46NX720, KDL-55NX720, KDL-60NX720
2. Service Manual 146 pages of 2011 FOR the models ----------------> KDL-40NX720, KDL-40NX723, KDL-40NX725, KDL-46NX720, KDL-46NX723, KDL-46NX725, KDL-55NX720, KDL-55NX723, KDL-55DX-57NX720 , KDL-60NX723, KDL-60NX725.
The appearance of MainBoard 1-883-754-12 is shown in the figure below:1-883-754-12
1-883-754-12 can be used in TVs:
SONY KDL-55NX720 (Panel LSY550HJ02), SONY KDL-46NX720 (Panel FDMY460LT01).
The appearance of the power supply
Main features of the device SONY KDL-46NX720:
Installed matrix (LED panel) FDMY460LT01.
The matrix control uses the Timing Controller (T-CON) V460H1-CPE5 ;.
The LED driver ST4055YL-S01 is used to power the backlight LEDs, it is controlled by the BD9276EFV, LM2904 PWM controller.
The formation of the necessary supply voltages for all nodes of the SONY KDL-46NX720 TV is carried out by the APS-295 power module, or its analogs using microchips MIP2H2, CXA3811M, CXA3812M, LM2904.
MainBoard - the main board (motherboard) is a 1-883-754-12 module, using CPU chips: CXD4727GB; NAND: TC58RYG1S8EBAIA; DDR3 K4B2G1646C-HCH9; Si19287BCNU; GL850G (MN1GD07G21); PS54425; BD95830; RTL8201ES; S24CS02A and others.