Technical description and composition of the TV SONY KDL-46W5740, type of panel and applicable modules. The composition of the modules.SONY
Model: KDL-46W5740
Chassis / Version: EX2L
Panel: LTY460HF05
T-CON: 46NN_MB4C6LV0.6
Inverter (backlight): SSB460H16S01 REV0.2
Power Supply (PSU): 1-878-599-11 IP2
PWM Power: CXD9969P, MIP2H2, LX1692, BA2901SF
MOSFET Power: 2SK3934 (PFC), TK8A50D
MainBoard: 1-878-942-22 BA board PCB - A-1663-964-B
IC MainBoard: MC10147F1 410, MB91F313A, NAND Flash K9F1208UOC, EEPROM 24c32
Tuner: BTD-HF422T
Control: RM-ED012
Technical Specifications KDL-46W5740
SONY KDL-46W5740
General recommendations for repairing TV LCD
SONY KDL-46W5740 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. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
If the KDL-46W5740 TV does not turn on, does not make any sounds when it is turned on, and also no indicators on the front panel light or blink, there is a high probability of a malfunction in the power module. In some cases, there may be a malfunction only in standby power. When diagnosing and repairing the power supply, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. When it is broken, the power elements of transistors and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
In most cases, key breakdowns in switching power supplies (SMPS) do not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM chip from the manufacturer.
In cases where the SONY KDL-46W5740 TV has lost an image, and the sound is there and all other functions are operational, there is a possibility of an inverter (converter for powering the backlight) malfunction. When you turn on the TV, the image may appear briefly and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power. It should be remembered that when protection is disabled in order to diagnose a malfunction, there is always a risk of failure of the power elements of the inverter. After repair, it is necessary to restore all standard converter protection circuits.
Repair of the motherboard BA 1-878-942-22 PCB - A-1663-964-B must begin with the diagnosis and verification of all linear stabilizers and power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
In the absence of tuning to local television channels, you should make sure that the software is correct, as well as the presence of supply voltages at the terminals of the BTD-HF422T tuner.
It is necessary to remember to users that attempts to self-repair a SONY KDL-46W5740 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
Service manual / schematic diagram -------------> Sony KDL-32/37/40/46W5500 chassis EX2L
Model name KDL-46V55/56xx, KDL-46W55/57xx, KDL-46WE5, KDL-40V55/56xx, KDL-40W55/57xx, 40WE5, KDL-40E55xx, KDL-37V55/56xx, KDL-37W55/57xx, KDL-32V55/56xx, KDL-32W55/57xx, KDL-32E55xx.
PSU / schematic diagram -------------> Sony 1-878-599-11 IP2 Power supply
The appearance of MainBoard 1-878-942-22 is shown in the figure below:1-878-942-22
1-878-942-22 can be used in televisions:
SONY KDL-32W5500 (Panel T315XW02 V.1), SONY KDL-37V5500 (Panel T370HW02 V.B.), SONY KDL-40V5610 (Panel LTY400HA12), SONY KDL-40W5500 (Panel LTY400HF05), SONY KDL-40WE5 (Panel LTY400HF02 102), SONY KDL-46W5500 (Panel LTY460HF05), SONY KLV-46V550A (Panel T460HW03 V.2), SONY KDL-46W5740 (Panel LTY460HF05).
The appearance of the power supply
Main features of the device SONY KDL-46W5740:
Installed matrix (LCD-panel) LTY460HF05.
The matrix control uses the Timing Controller (T-CON) 46NN_MB4C6LV0.6.
To power the backlight used inverter SSB460H16S01.
The necessary supply voltages for all nodes of the SONY KDL-46W5740 TV are generated by the power module 1-878-599-11, or its analogs using microcircuits CXD9969P, MIP2H2, LX1692, BA2901SF and power switches of the type 2SK3934 (PFC), TK8A50D.
MainBoard - the main board (motherboard) is a module 1-878-942-22, using microchips MC10147F1 410, MB91F313A, NAND Flash K9F1208UOC, EEPROM 24c32 and others.
The BTD-HF422T tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: S-LCD
Model: LTY460HF05
Type: a-Si TFT-LCD, Panel
Diagonal size: 46 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 1018.08x572.67 mm
Surface: Antiglare (Haze 7%), Hard coating (3H)
Brightness: 480 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8/6 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 16 pcs CCFL Embedded (Balance board)
Signal Interface: LVDS (2 ch, 10-bit), 55 pins
Voltage: 12.0V