Technical description and composition of the SONY KDL-32W705C TV, panel type and applicable modules. The composition of the modules.SONY LED
Model: KDL-32W705C
Panel: T320HVN05.3
LED backlight: 4-546-095
T-CON: T320HVN05.3 CTRL BD 32T42-C0C
LED driver (backlight): 1-894-073-11 (173532911)
Power Supply (PSU): Adapter 19.5V 4.36A ACDP-085E03
MainBoard: 1-894-792-21 (173566021)
IC MainBoard: CXD4748GB, CXD4743GB, TH58NVG3S0HTAI0, YDA179-S
Tuner: 1-894-336-12 (173543312)
Control: RMT-TX101E, 1-894-388-11 (173546511), J20H076 REV.0
Technical Specifications KDL-32W705C
SONY KDL-32W705C
General repair guidelines for TV LCD LED
Possible malfunctions
- The SONY KDL-32W705C TV does not turn on and does not show any signs of operability at all. There is no reaction to the remote control and control buttons from the front panel.
Most often, with such manifestations, the main adapter power module is found to be faulty.
The TV is equipped with an external Adapter 19.5V 4.36A ACDP-085E03 power supply, which the owner can purchase without repair, however, it is often easy to open and eliminate the simplest typical defects. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of the power switches of the converters and rectifier diodes for the presence of a possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM), if they do not have visible damage to the chassis and open short circuit between the terminals, are usually checked by replacement.
- 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 some of these cases, the malfunction is caused by a lack of backlighting on the display. The reason can be found in the malfunction of the LEDs, in the violation of the contact connections of the LED strips, or in the provision of their power (LED driver).
It is impossible to check the line of series-connected LEDs without a special current source, and for this purpose it is not safe to use any voltage sources above 12V for them. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the 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 enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the 1-894-792-21 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 it is necessary to check or replace (if necessary) the elements of the MainBoard board - CXD4748GB, CXD4743GB, TH58NVG3S0HTAI0, YDA179-S. In cases where the BGA processor is used, its malfunction is usually detected by local heating.
If a tuner 1-894-336-12 (173543312) is suspected of malfunction, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary power supply voltage levels and data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
The appearance of MainBoard 1-894-792-21 is shown in the figure below:1-894-792-21
1-894-792-21 can be used in TVs:
SONY KDL-40W705C (Panel NS5S400VND11), SONY KDL-32W705C (Panel T320HVN05.3).
Main features of the device SONY KDL-32W705C:
Installed matrix (LED panel) T320HVN05.3.
The matrix control uses the Timing Controller (T-CON) T320HVN05.3.
The LED driver 1-894-073-11 (173532911) is used to power the backlight LEDs.
To power all the internal components of the SONY KDL-32W705C TV, an external adapter type 19.5V 4.36A ACDP-085E03 is used.
MainBoard - the main board (motherboard) is a module 1-894-792-21, using microchips CXD4748GB, CXD4743GB, TH58NVG3S0HTAI0, YDA179-S and others.
The tuner 1-894-336-12 (173543312) provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T320HVN05.3 CELL
Type: a-Si TFT-LCD, CELL
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA3, Normally Black, Transmissive
Active Area: 698.4x392.85 mm
Surface: Antiglare, Hard coating (3H)
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit)
Response Time: 6.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V