Technical description and composition of the SONY KDL-40EX710 TV, panel type and applicable modules. The composition of the modules.SONY LED
Model: KDL-40EX710
Chassis / Version: AZ1-L
Panel: LTU400HF01
LED backlight: SLS40_5630 60 / 120Hz 44LED Rev1
T-CON: TDL-C4LV0.4
LED driver (backlight): integrated into PSU
Power Supply (PSU): 1-881-956-12
PWM Power: MIP2H2 (Stb), CXD9969AP
MainBoard: 1-881-636-23
IC MainBoard: TA55707, MB91F313A
Tuner: SUT-AE101T
Technical Specifications KDL-40EX710
SONY KDL-40EX710
General repair guidelines for TV LCD LED
Possible malfunctions
- The SONY KDL-40EX710 TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
Often in such cases, the power module 1-881-956-12 is faulty. Then it is necessary to measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for a possible short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM) MIP2H2 (Stb), CXD9969AP, if they do not have visible damage to the case and open fault between the terminals, are usually checked by replacement.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
Often in such cases, there is no LED backlight. Often the cause of the malfunction is the lack of current in the LED circuit, for example, an open or short circuit, or a violation of the contact connections of the connectors.
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the 1-881-636-23 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). Board repair and chip replacement TA55707, MB91F313A are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
Before changing the SUT-AE101T tuner, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding tuner pins and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Attention to users! Self-repair of a SONY KDL-40EX710 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
Service manual / schematic diagram -------------> SONY KDL-40EX710 Chassis AZ1-L
The appearance of MainBoard 1-881-636-23 is shown in the figure below:1-881-636-23
The appearance of the power supply
Main features of the device SONY KDL-40EX710:
Installed matrix (LED-panel) LTU400HF01.
The matrix control uses the Timing Controller (T-CON) TDL-C4LV0.4.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the SONY KDL-40EX710 TV is carried out by the power module 1-881-956-12, or its analogs using microchips MIP2H2 (Stb), CXD9969AP.
MainBoard - the main board (motherboard) is a module 1-881-636-23, using chips TA55707, MB91F313A and others.
The SUT-AE101T tuner provides television reception and channel tuning.