Technical description and composition of the SONY KDL-40BX440 TV, panel type and applicable modules. The composition of the modules.SONY
Model: KDL-40BX440
Chassis / Version: AZ3WK
Panel: LTA400HM19
Inverter (backlight): integrated into PSU
PWM Inverter: DDA009
Trans Inverter: MP-130I (00) IH-DP11010
Power Supply (PSU): DPS-166DP
PWM Power: ICE2QS03G, NCP1608B (PFC), S101
MainBoard: MT5367_MB - S1101-1 - 48.73R01.011
IC MainBoard: MT5367JUNU, STA381BWS, RT7257AL, MT5135AE, APA2172, NT5CB128M16BP-CG, TC58DVM92A5TAI0, ST24C128BWP
Tuner: SUT-RE215TN
Technical Specifications KDL-40BX440
SONY KDL-40BX440
General recommendations for repairing TV LCD
It is reasonable to start the repair of the SONY KDL-40BX440 TV with a careful external inspection before proceeding to the diagnosis of the malfunction. It is advisable to carefully internal and external components. Many visible signs make it possible to determine the future direction of troubleshooting and localization of the defect. In most cases, the repairman can guess the causes of the defect and possible consequences by the characteristic signs of typical TV defects, for example, ring cracks formed in the soldering of element leads, swollen rectifier filter capacitors, charred resistors and other circuit elements.
In the case when the KDL-40BX440 does not turn on, does not respond to the remote control and the front panel buttons, does not blink bulbs and does not show any signs of operability, most likely in this case the DPS-166DP power module is faulty. In this case, the diagnosis and repair of the common power supply should always be started by checking the mains fuse. When it breaks, it is advisable to check for a breakdown, first of all, all power semiconductor elements of the converter and the rectifier diode bridge of the network, as well as the large electrolytic filter capacitor of the network rectifier and the key transistor.
It should be remembered that in the practice of repair, usually the power keys of N-Fet converters do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
Diagnostics of power modules with a Power Factor Corrector (CMC) is somewhat more complicated and requires a more detailed approach.
If the SONY KDL-40BX440 does not have an image, but there is sound, there is a possibility of a malfunction of the backlight or power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
Diagnosis and repair of the inverter is often complicated by the organization of special protection circuits, which is necessary for fire safety and turns off the inverter in any emergency situation, for example, when the lamps are worn or depressurized. Often, to localize a defect, its blocking is required.
In such cases, the risk of failure of the power elements of the inverter is most likely, and special care is required during work, and after their completion, it is necessary to restore the protection circuit for further safe operation of the TV by the owner in normal mode.
In cases of attempts to repair the MB board (SSB), it is necessary to check the health of its elements - percent, MEDIATEK which may require replacement with new ones.
It should be remembered! Attempts to repair the SONY KDL-40BX440 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!
Service manual / schematic diagram -------------> Sony KLV-32BX350, KLV-40BX450, KLV-46BX450 CHASSIS AZ3WK 2-PFL, Main Board A, Power G9, G11, W40
The appearance of the MainBoard MT5367_MB is shown in the figure below:MT5367_MB
MT5367_MB can be used on TVs:
SONY KDL-32BX340 (Panel LTA320AN08 U01), SONY KDL-40BX440 (Panel LTA400HM19).
PSU Advanced
The DPS-166DP power module is made using the Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC assembly is a Step-Up Converter based on the NCP1608B PWM controller, which evenly distributes high-frequency impulses of the charging current of the electrolytic capacitor of the rectifier filter of the mains voltage over a period of 50 Hz. The current of its charge in this case will already be determined not by its reactance (usually 10-30 ohms for the network frequency), but by the elements of the converter. As a result, a change in the amplitude of the pulses (envelope) of the consumed current of the converter will repeat the shape and phase of the input sinusoidal voltage. The availability of an increased voltage (about + 380V) in the operating mode on the capacitor of the line filter indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the device SONY KDL-40BX440:
Installed matrix (LCD-panel) LTA400HM19.
To power the backlight, a converter is used, combined with a power supply, controlled by the DDA009 PWM controller. The transformer MP-130I (00) IH-DP11010 is installed in the inverter converter.
The necessary supply voltages for all nodes of the SONY KDL-40BX440 TV are generated by the DPS-166DP power module or its analogs using ICE2QS03G, NCP1608B (PFC), S101 microcircuits.
MainBoard - the main board (motherboard) is an MT5367_MB module, using MT5367JUNU, STA381BWS, RT7257AL, MT5135AE, APA2172, NT5CB128M16BP-CG, TC58DVM92A5TAI0, ST24C128BWP and other chips.
The SUT-RE215TN tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA400HM19
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: PVA, Normally Black, Transmissive
Active Area: 885.6x498.15 mm
Surface: Antiglare (Haze 2%)
Brightness: 400 cd / m²
Contrast Ratio: 4000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 10 pcs CCFL Without Driver
Signal Interface: Mini LVDS, 68 pins
Voltage: 12.0V