Technical description and composition of the SONY KDL-46W905A TV, panel type and applicable modules. The composition of the modules.SONY LED
Model: KDL-46W905A
Panel: YLV4621-02N
T-CON: 1-888-061-11-188806111
LED driver (backlight): ST4055LD-S02 REV: 1.0
Power Supply (PSU): APS-343 - 1-888-119-11 - 188811911 p / n: 147448011
PWM Power: PWM
MainBoard: 1-888-101-31 188810131 - 173415631 - Y200A420A
IC MainBoard: CPU: CXD4739GB; NAND Flash: TC58DVG3S0ETA00 (TC58NVG3S0FTAI0)
Control: RM-ED052, J20H070
Appearance
SONY KDL-46W905A
General repair guidelines for TV LCD LED
In the case when the KDL-46W905A does not turn on, does not respond to the remote control and buttons on the front panel, does not blink light bulbs and does not show any signs of operability, probably in this case the APS-343 power module is faulty - 1-888-119-11 - 188811911 p / n: 147448011. It is advisable to start the troubleshooting of the power supply module by checking the condition of the electrolytic capacitors of the rectifier filters and the mains fuse. Defective capacitors should be replaced. If the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and transistors, which are often found in such a state of 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 PWM chip from the manufacturer.
If the SONY KDL-46W905A TV does not have an image, but there is sound, a malfunction in the backlight circuits of the LED panel YLV4621-02N is likely.
The lack of backlight often occurs due to an open circuit in the LED circuit. There is a need for disassembling the panel and checking the LEDs themselves, as well as the same contact connections in the connectors and rations of the terminals.
To check the health in the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
Repair or diagnostics of the motherboard 1-888-101-31 188810131 - 173415631 - Y200A420A should begin by checking the stabilizers and power converters needed to power the microcircuits and matrix. If necessary, you should update the software (software).
In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its NAND Flash chips: tc58nvg3s0ftai0 and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
In cases where there is no 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 voltage at the terminals of the Tuner. 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.
Once again, remind users! Attempts to self-repair a SONY KDL-46W905A TV without the appropriate qualifications and experience can lead to its complete non-repairability!
The appearance of MainBoard 1-888-101-31 is shown in the figure below:1-888-101-31
1-888-101-31 can be used in TVs:
SONY KDL-42W808A (Panel LC420EUF (FF)(P2)), SONY KDL-46W905A (Panel YLV4621-02N), SONY KDL-40W905A (Panel YLV4021-02N).
The appearance of the power supply
Main features of the device SONY KDL-46W905A:
Installed matrix (LED panel) YLV4621-02N.
The matrix control uses the Timing Controller (T-CON) 1-888-061-11-188806111.
The LED driver ST4055LD-S02 is used to power the backlight LEDs.
The formation of the necessary supply voltages for all nodes of the SONY KDL-46W905A TV is carried out by the APS-343 power module, or its analogs using PWM chips.
MainBoard - the main board (motherboard) is a module 1-888-101-31, using CPU chips: CXD4739GB; NAND Flash: TC58DVG3S0ETA00 (TC58NVG3S0FTAI0) and others.