Technical description and composition of the TV SONY KDL-40RD453, type of panel and applicable modules. The composition of the modules.SONY LED
Model: KDL-40RD453
Chassis / Version: BBE
Panel: NS6S400DH01
T-CON: 15Y_S40FF11MB7S4L V0.2
LED driver (backlight): integrated into MainBoard
PWM LED driver: BD9423EFV
Power Supply (PSU): Adapter 19.5V
MainBoard: 1-980-335-22 (173587122)
IC MainBoard: MT5566BQVT
Tuner: DE243ZP
Technical Specifications KDL-40RD453
SONY KDL-40RD453
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The SONY KDL-40RD453 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.
With such manifestations, the Adapter power module usually fails.
The external adapter 19.5V power supply is not always subject to repair, especially since the owner can purchase it independently. But, in some cases, it makes sense to open it and eliminate the simple typical defects inherent in converters in pulsed sources. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, check the serviceability of power switches and rectifier diodes for a possible breakdown (short circuit).
In case of breakdowns of semiconductors in secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke the excess of maximum current or voltage values. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
Often in such cases, there is no LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source. By opening the panel, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the motherboard 1-980-335-22 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 replacement of MT5566BQVT microcircuits 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.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the tuner DE243ZP and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
It should be remembered! Attempts to independently repair the SONY KDL-40RD453 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!
The appearance of MainBoard 1-980-335-22 is shown in the figure below:1-980-335-22
1-980-335-22 can be used in TVs:
SONY KDL-32RD433 (Panel IS6S320DNO01), SONY KDL-32WD603 (Panel HV320WHB-N5K), SONY KDL-40RD453 (Panel NS6S400DH01).
Main features of the device SONY KDL-40RD453:
Installed matrix (LED-panel) NS6S400DH01.
The matrix control uses the Timing Controller (T-CON) 15Y_S40FF11MB7S4L.
To power the backlight LEDs, a converter is used, combined with the main board 1-980-335-22, controlled by the BD9423EFV PWM controller.
To power all the internal components of the SONY KDL-40RD453 TV, an external adapter 19.5V type source is used.
MainBoard - the main board (motherboard) is a module 1-980-335-22, using MT5566BQVT chips and others.
The DE243ZP tuner provides TV reception and channel tuning.