Technical description and composition of the SONY KD-55X9005B TV, panel type and applicable modules. The composition of the modules.SONY
Model: KD-55X9005B
Panel: YD4S550LTU01
T-CON: T550VGN02.0
Power Supply (PSU): APS-369 (CH) 1-893-297-11
MainBoard: 1-893-272-21 A2036654B
Tuner: 1-893-273-11
Technical Specifications KD-55X9005B
SONY KD-55X9005B
General recommendations for repairing TV LCD
Possible malfunctions
- The SONY KD-55X9005B TV does not turn on at all. There is no reaction to the remote control and control buttons from the front panel. Indicator lights do not light or flash.
Often in such cases, the APS-369 power module is faulty. It is then necessary to measure its output voltages and, if they are absent, you should check the power switches and rectifier diodes of the converters for the probability of a 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.
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), if they do not have visible damage to the chassis and open short circuit between the terminals, are usually checked by replacement.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
These manifestations can be triggered by the power module, or by inverter defects, as well as by the distortion of the currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the transformers for an open.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- 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 1-893-272-21 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).
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltages at the terminals of the tuner 1-893-273-11. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Attention TV owners! Attempts at self-repair of SONY KD-55X9005B are not recommended by the manufacturer and can lead to serious negative consequences!
The appearance of MainBoard 1-893-272-21 is shown in the figure below:1-893-272-21
The appearance of the power supply
Main features of the device SONY KD-55X9005B:
Installed matrix (LCD panel) YD4S550LTU01.
The matrix control uses the Timing Controller (T-CON) T550VGN02.0.
The formation of the necessary supply voltages for all nodes of the SONY KD-55X9005B TV is carried out by the APS-369 power module, or its analogs.
MainBoard - the main board (motherboard) is a module 1-893-272-21.
The tuner 1-893-273-11 provides reception of television programs and tuning to channels.
