Technical description and composition of the TV SONY KDL-40EX521, type of panel and applicable modules. The composition of the modules.SONY LED
Model: KDL-40EX521
Chassis / Version: AZ2F P-1
Panel: LTY400HM08 001
LED backlight: LJ64-02826A STS400A23.62LED
T-CON: ESL_MB7_C2LV1.3 SM4109 DA1042, LQF6041T08-01, ISL24835
LED driver (backlight): with integrated PSU
PWM LED driver: CXD9969 (16)
MOSFET LED driver: KF5N50
Power Supply (PSU): APS-285 GE3 2011 1-883-804-22
PWM Power: MIP2H2 (7), CXD9969AP
MainBoard: 1-883-753-32 015276 Rev101
IC MainBoard: CXD47278B, RTL8201ES, MN1GD07G21
Control: Remote: RM-ED045, IR: 1-883-758-11
Technical Specifications KDL-40EX521
SONY KDL-40EX521
General repair guidelines for TV LCD LED
The SONY KDL-40EX521 TV, like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. Often by the external signs and nature of the damage to the elements, it becomes possible to draw some conclusions and determine a further algorithm for finding a defect before making the necessary measurements at control points. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
If the SONY KDL-40EX521 does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a failure of the APS-285 GE3 2011 power module. In some cases, only the processor power regulator may be faulty. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and the electrolytic capacitors of the filters of the converter secondary rectifiers. In the event of a fuse breaking, the reason should be sought in the power semiconductor elements of the pulse converter of the main power supply. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power switch (s) of the converter.
Mos-Fet keys used in switching power supplies (SMPS) rarely fail for no reason to look for when checking other circuit elements. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM controller chip MIP2H2 (7) can also cause a breakdown of the power switch of the converter.
If the SONY KDL-40EX521 does not have an image, but there is sound and the TV is controlled by the remote control, there may be a malfunction in the backlight circuits of the LTY400HM08 001 panel. The LEDs or the power converter - LED driver may be malfunctioning. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the LED driver, and check the LEDs, connecting obviously known good diagnostics.
Often there is a need for disassembling the panel to check the health of the LEDs, as well as contact connections in the connectors and soldering.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
On the motherboard 015276 Rev101 1-883-753-32, in the event of a malfunction, you should first check the performance of all stabilizers or power converters of the microcircuits and, if necessary, update the software (software).
If it is not possible to replace the MB board (SSB), you need to check the health of its elements - CXD47278B, RTL8201ES, MN1GD07G21. Defective components should be replaced.
Owners and users of the SONY KDL-40EX521 TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Service manual / schematic diagram -------------> Sony KDL-32EX421/423, KDL-32EX520/521/523, KDL-40EX520/521/523, KDL-46EX520/521/523 CHASSIS AZ2-F
Service manual / schematic diagram -------------> APS-285 GE3A 1-883-804-11 chassis: AZ2-F Power supply
The appearance of MainBoard 1-883-753-32 is shown in the figure below:1-883-753-32
1-883-753-32 can be used in TVs:
SONY KDL-32CX520 (Panel V315H3-L01), SONY KDL-32EX421 (Panel LTY320AN02), SONY KDL-32EX720 (Panel LTY320HJ01), SONY KDL-40EX521 (Panel LTY400HM08 001), SONY KDL-46EX720 (Panel LTY460HJ05 3D), SONY KDL-46CX520 (Panel LTY460HN01), SONY KDL-40CX521 (Panel LTY400HM07).
The appearance of the power supply
Main features of the device SONY KDL-40EX521:
Installed matrix (LED-panel) LTY400HM08 001.
The matrix control uses the Timing Controller (T-CON) ESL_MB7_C2LV1.3.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by a CXD9969 PWM controller (16). As the power elements of the LED driver, keys of the KF5N50 type are used.
The necessary supply voltages for all components of the SONY KDL-40EX521 TV are generated by the APS-285 power module, or its analogs using MIP2H2 (7), CXD9969AP microcircuits.
MainBoard - the main board (motherboard) is a 1-883-753-32 module, using CXD47278B, RTL8201ES, MN1GD07G21 and others.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTY400HM08
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 885.6x498.15 mm
Surface: Antiglare (Haze 5.5%), Hard coating (2H)
Brightness: 400 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 1.07B (8-bit + Hi-FRC), CIE1931 72%
Response Time: 12/8 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 2 strings WLED Without Driver
Signal Interface: LVDS (2 ch, 10-bit), 51 pins
Voltage: 12.0V