Technical description and composition of the SONY KDL-26BX320 TV, panel type and applicable modules. The composition of the modules.SONY
Model: KDL-26BX320
Chassis / Version: AZ2EK
Panel: T260XW04 V.7
Inverter (backlight): 4H.V2258.231 A1 E206453 V225-B02
Power Supply (PSU): APS-283 1-883-775-21
PWM Power: MIP2H2, CXA3810
MainBoard: MT66-EU S01.00-2
IC MainBoard: MT5135AE, STA3698WS, PS331
Tuner: SUT-RE205TN
Technical Specifications KDL-26BX320
SONY KDL-26BX320
General recommendations for repairing TV LCD
Possible malfunctions
- The SONY KDL-26BX320 TV does not turn on and does not show any signs of operability. There is no reaction to either the remote control or the control buttons from the front panel.
Usually with such manifestations, the main power module APS-283 is found to be faulty. First of all, in this case, you should check the operation of the standby converter implemented on the MIP2H2 PWM controller.
With its serviceability, it is necessary to measure the output voltage of the main source. In the case of a complete absence of voltage in the secondary circuits, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for the presence of a possible short circuit.
In the event of a breakdown in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the main fuse or current sensor at the source of the key most often breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback.
PWM circuits MIP2H2, CXA3810 are usually checked by replacing with working ones.
- There is no image, there is sound, it reacts to the remote control, channels are switched. In some cases, the image appears when you turn on and immediately 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. If all the electrolytic capacitors of the filter according to the power supply of the inverter are serviceable, you should make sure that the lamps are in good working condition, then you need to check the converter keys and the secondary windings of the transformers.
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 operating mode, it does not respond to the remote control.
Repair or diagnostics of the MT66-EU motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - MT5135AE, STA3698WS, PS331. Defective components should be replaced.
Before changing the SUT-RE205TN 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
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
Service manual / schematic diagram -------------------> Sony KDL-26BX320, KDL-26BX321, KDL-32BX320, KDL-32BX321, KDL-32BX420, KDL-37BX420, KDL-40BX420 Chassis AZ2EK P-2F
The appearance of the MainBoard MT66-EU is shown in the figure below:MT66-EU
MT66-EU can be used in TVs:
SONY KDL-32BX420 (Panel T315HW04 V.C), SONY KDL-26BX320 (Panel T260XW04 V.7).
The appearance of the power supply
Main features of the device SONY KDL-26BX320:
The matrix (LCD panel) T260XW04 V.7 is installed.
To power the backlight, an inverter 4H.V2258.231 is used.
The formation of the necessary supply voltages for all nodes of the SONY KDL-26BX320 TV is carried out by the APS-283 power module, or its analogs using MIP2H2, CXA3810 microcircuits.
MainBoard - the main board (motherboard) is an MT66-EU module, using chips MT5135AE, STA3698WS, PS331 and others.
The SUT-RE205TN tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: AU Optronics
Model: T260XW04 V7 CELL
Type: a-Si TFT-LCD, CELL
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: MVA, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare, Hard coating (3H)
Glass Depth: 0.70 + 0.70 mm
Contrast Ratio: 4000: 1
Display Colors: 16.7M (8-bit)
Response Time: 6.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
