Technical description and composition of the SONY KDL-50W705B TV, panel type and applicable modules. The composition of the modules.SONY LED
Model: KDL-50W705B
Chassis / Version: RB2G
Panel: T500HVF04.2
LED backlight: 74.50T21.001-1-DX1 LB50016 V3_R, LB50016 V2_L
T-CON: T500HVN08.0 CTRL BD 50T20-C04
LED driver (backlight): 14STM4250AD-6S01 Rev1.0
PWM LED driver: BD9422EF
MOSFET LED driver: SBR10150CT, TPC8127
Power Supply (PSU): ACDP-120E02 Adapter 19.5V 6.2A
MainBoard: 1-889-202-12 173457412 A2042153B
IC MainBoard: CXD4748GB, CXD4743GB, TC58NVG3S0FTAI0, YDA179-S, SiI9589CTUC, RTL8201FR
Tuner: 1-889-203-22 173457522 A1998226B
Control: Remote: RM-ED061, IR: 1-889-245-11 (173459911), WiFi: J20H069 MCLJ20H069 2878D-J20H069
Technical Specifications KDL-50W705B
SONY KDL-50W705B
General repair guidelines for TV LCD LED
Possible malfunctions
- The SONY KDL-50W705B TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
Failure in such cases should begin to be sought in the ACDP-120E02 power supply circuits.
The external ACDP-120E02 Adapter 19.5V 6.2A power supply is not always subject to repair, especially since the owner can purchase it independently. But, in some cases, it makes sense to open it and eliminate the simple typical defects inherent in converters in pulsed sources. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches and rectifier diodes for a probable short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
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 the remote control. Or for a second, the image may appear immediately after switching on.
Often in such cases, there is no LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To check the LED strips, to open all the transitions of the LEDs, several tens of volts or more are needed, it is best to use a current source for such purposes. The breakage of several PN junctions connected in series cannot be detected with a multimeter or tester. In such cases, it is necessary to open the panel and check each LED. If your multimeter cannot open the LED transitions in forward bias, sometimes you can detect the presence of a PN junction of the protective zener diode by connecting the probes in the opposite direction. If the zener diode is broken or broken in short-circuit, then the LED is faulty and needs to be replaced.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the 1-889-202-12 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, TC58NVG3S0FTAI0, YDA179-S, SiI9589CTUC, RTL8201FR. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
In the absence of 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 voltages at the terminals of the tuner 1-889-203-22 173457522 A1998226B. 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.
Owners and users of the SONY KDL-50W705B TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
The appearance of MainBoard 1-889-202-12 is shown in the figure below:1-889-202-12
1-889-202-12 can be used in TVs:
SONY KDL-42W706B KDL-42W706W (Panel T420HVF06.1), SONY KDL-40W605B (Panel NS4S400DND01 4-528-221-02), SONY KDL-48W585B (Panel LSY480HN01-A03), SONY KDL-32W705B (Panel T320HVF04.0 xxxxG), SONY KDL-50W705B (Panel T500HVF04.2).
The appearance of the power supply
Main features of the device SONY KDL-50W705B:
Installed matrix (LED-panel) T500HVF04.2.
The matrix control uses the Timing Controller (T-CON) T500HVN08.0.
The LED driver 14STM4250AD-6S01 is used to power the backlight LEDs, it is controlled by the BD9422EF PWM controller. As power elements of the LED driver, keys of the type SBR10150CT, TPC8127 are used.
To power all the internal components of the SONY KDL-50W705B TV, an external source such as ACDP-120E02 Adapter 19.5V 6.2A is used.
MainBoard - the main board (motherboard) is a module 1-889-202-12, using microchips CXD4748GB, CXD4743GB, TC58NVG3S0FTAI0, YDA179-S, SiI9589CTUC, RTL8201FR and others.
The tuner 1-889-203-22 173457522 A1998226B provides the reception of television programs and tuning to channels.
SONY KDL-50W705B TV with T500HVF04.2 LCD, 50 "(127 cm) diagonal size in 16: 9 format. This model uses side illumination from Edge LEDs.
The T500HVF04.2 panel and the motherboard software 1-889-202-12 provide for viewing HD and Full HD images at a resolution of 1920x1080 pixels in a graphical decomposition according to the 1080p standard (Full HD).
The KDL-50W705B is equipped with SMART software, embedded applications and the ability to work on the Internet. Connecting to the Internet can be done via Wi-Fi. The input analog video signal can be processed in PAL, SECAM, NTSC systems. Graphic processing and image formation of a digital signal occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Video processor supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
The power of the sound speaker system 16 W (2x8 W) is provided by two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, SCART, RGB, HDMI x4, MHL, USB x2, Ethernet (RJ-45), Wi-Fi 802.11n, Miracast. An output for connecting headphones is provided. To connect an analog computer or laptop to this TV model, a VGA (D-Sub 15) connector is used, which supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080.
The digital tuner is capable of receiving television channels in the standards DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2.
The power consumed by the TV in the operating mode from the network is 100 watts.
Overall dimensions: with stand 1116x693x179 mm, without stand 1116x656x64 mm.
TV Weight: with stand: 14.8 kg, without stand: 13.6 kg.
Attention! The T500HVF04.2 panel of the SONY KDL-50W705B LED TV is its most expensive element.
Avoid hitting the glass and excessive pressure on the screen surface to avoid damage to the LED panel!
It is unsafe to get any liquid on the screen. Sometimes one drop of water is enough, if it flows down the glass onto the cables, the TV can become unrepairable.