Technical description and composition of the TV SONY KDL-43W756C, type of panel and applicable modules. The composition of the modules.SONY LED
Model: KDL-43W756C
Chassis / Version: BMX
Panel: V430FWME03
LED backlight: WCM # 1 733.00X0A.XXXX R02 = EVERLIGHT LBM430M1403-AB-2 (HF) (0) (R) and WCM # 1 733.00X09.XXXX R02 = EVERLIGHT LBM430M1403-AA-2 (HF) (0) ( L)
T-CON: T550HVN08.2 CTRL BD, 55T23-C03
LED driver (backlight): 15STM6S-ABC01 Rev1.0
PWM LED driver: BD9397EFV
MOSFET LED driver: STU30N01
Power Supply (PSU): Adapter
MainBoard: 1-893-880-11 (173525511)
IC MainBoard: THGBMBG7D2KBAIL
Tuner: CE241ZP
Control: IR: 1-894-388-11 173546511, WIFI: AK8J20H084AC J20H084AC
Technical Specifications KDL-43W756C
SONY KDL-43W756C
General repair guidelines for TV LCD LED
Possible malfunctions
- The SONY KDL-43W756C TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
With such manifestations, the Adapter power module usually fails.
This TV model is equipped with an external adapter type power supply, which the owner can purchase independently, and repairing it may not always be advisable, however, sometimes it makes sense to open it and eliminate simple typical defects typical of IPS. Then we recommend that you measure its output voltages and, if they are absent, you should check the health of the power switches and rectifier diodes of the converters for a probable short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM microcircuits are usually checked by replacement with new ones, or obviously working.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
In most of these cases, a malfunction is detected in the nodes and backlight elements of the LED panel. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source. By opening the panel, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the 1-893-880-11 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). Sometimes they require checking or replacing (if necessary) the elements of the MainBoard board - THGBMBG7D2KBAIL. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
If the TV works normally from external devices, but does not tune into television channels, the CE241ZP tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
We recommend the owners of the KDL-43W756C TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
The appearance of MainBoard 1-893-880-11 is shown in the figure below:1-893-880-11
1-893-880-11 can be used in TVs:
SONY KDL-43W756C (Panel V430FWME03), SONY KDL-50W807C (Panel V430FWME03).
Main features of the device SONY KDL-43W756C:
Installed matrix (LED panel) V430FWME03.
The matrix control uses the Timing Controller (T-CON) T550HVN08.2.
The LED driver 15STM6S-ABC01 is used to power the backlight LEDs, it is controlled by the BD9397EFV PWM controller. As power elements of the LED driver, keys of the STU30N01 type are used.
To power all the internal components of the SONY KDL-43W756C TV, an external adapter type source is used.
MainBoard - the main board (motherboard) is a module 1-893-880-11, using chips THGBMBG7D2KBAIL and others.
The CE241ZP tuner provides TV reception and channel tuning.