Technical description and composition of the SONY KDL-32WD756 TV, panel type and applicable modules. The composition of the modules.SONY LED
Model: KDL-32WD756
Chassis / Version: 1-980-335-12
Panel: S320HF58 V4
T-CON: HV320FHB-N80
LED driver (backlight): integrated into MainBoard
PWM LED driver: BD9423EFV
MOSFET LED driver: D2910
Power Supply (PSU): ACDP-060S03 Adapter 19.5V
MainBoard: 1-980-335-12 (173587112) - A2103242A
IC MainBoard: CPU: MT5566CQVT
Tuner: CE243ZP
Technical Specifications KDL-32WD756
SONY KDL-32WD756
General repair guidelines for TV LCD LED
Possible malfunctions
- The SONY KDL-32WD756 TV does not turn on at all. There is no reaction to the remote control and control buttons from the front panel. Indicator lights do not light or flash.
In some of these cases, a fault is detected in the ACDP-060S03 power supply module.
This TV model is equipped with an external power supply unit such as ACDP-060S03 Adapter 19.5V, which the owner can purchase independently, and repairing it may not always be advisable, however, sometimes it makes some sense to open it and eliminate simple typical defects typical of IPS . It is necessary to measure its output voltages and, in case of their absence, check the serviceability of power switches and rectifier diodes in the converters for possible breakdown.
In the event of breakdowns 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 mains fuse or current sensor at the source of the key most often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
In such cases, the most likely malfunction of the LED backlight elements. 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.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). 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 motherboard 1-980-335-12 should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - CPU: MT5566CQVT and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
If the TV works normally from external devices, but does not tune into television channels, the CE243ZP 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.
TV users and owners need to remember that attempts to self-repair a SONY KDL-32WD756 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
The appearance of MainBoard 1-980-335-12 is shown in the figure below:1-980-335-12
The appearance of the power supply
Main features of the device SONY KDL-32WD756:
Installed matrix (LED-panel) S320HF58 V4.
The matrix control uses the Timing Controller (T-CON) HV320FHB-N80.
To power the backlight LEDs, a converter is used, combined with the main board 1-980-335-12, controlled by the BD9423EFV PWM controller. As power elements of the LED driver, keys of the D2910 type are used.
To power all the internal components of the SONY KDL-32WD756 TV, an external source such as ACDP-060S03 Adapter 19.5V is used.
MainBoard - the main board (motherboard) is a module 1-980-335-12, using CPU chips: MT5566CQVT and others.
The CE243ZP tuner provides TV reception and channel tuning.