Technical description and composition of the TOSHIBA 46WL768R TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 46WL768R
Panel: LTA460HQ06
PWM Power: 3BR1765JZ (Standby)
MainBoard: PE0890 V28A001176A1
Tuner: ENGS301D, SCEB3AH satellite
Specifications 46WL768
TOSHIBA 46WL768R
General repair guidelines for TV LCD LED
Repair of the TOSHIBA 46WL768R TV should begin with a fault diagnosis, which involves a careful examination of the external and internal elements of the device. Many visible changes in the state of the elements make it possible to determine the further direction of troubleshooting and localization of the defect. Electrolytic capacitors of filters with a swollen casing, as well as ring cracks formed in the soldered leads of heating elements, or a layer of coal on burnt resistors sometimes tell the repairman the causes of the malfunction and possible consequences.
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when turned on, there is a certain probability that the power module is defective and needs repair. Sometimes a similar manifestation may occur only in the absence of processor power, which is typical for certain TOSHIBA models. In the general case, first of all, it is necessary to check the electrolytic capacitors of the secondary rectifier filters and the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Possible options.
Mos-Fet keys used in switching power supplies (SMPS) rarely fail for no reason to look for when checking other circuit elements. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The chip of the PWM controller 3BR1765JZ dezh BP can also be the cause of the breakdown of the power switch of the converter.
Sometimes the TOSHIBA 46WL768R TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the LTA460HQ06 panel backlight LEDs converter, or a break in the LED circuit is possible. In such cases, first of all, it is necessary to verify the serviceability of all the electrolytic capacitors of the filter by supplying the LED driver itself, including in the power supply unit (power supply unit).
In most cases of lack of backlight, it becomes necessary to disassemble the panel in order to check the LEDs, connectors, loops and all contact connections. If one or several LEDs does not work in one line, therefore, they are broken and should be replaced.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required.
In cases where there is no tuning to the local television channels, you should make sure that there is varicap supply voltage (30-33V) and other supply voltages at the terminals of the ENGS301D SCEB3AH satellite tuner.
Attention! For users and owners of 46WL768R TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-serviceability of the device.
Repair MainBoard
The appearance of MainBoard PE0890 is shown in the figure below:
PE0890
Main features of the TOSHIBA 46WL768R device:
Installed matrix (LED panel) LTA460HQ06.
The necessary supply voltage for all nodes of the TOSHIBA 46WL768R TV is provided by a switching power supply using 3BR1765JZ (Standby) microcircuits.
MainBoard - the main board (motherboard) is a PE0890 module.
Tuner ENGS301D, SCEB3AH satellite provides reception of television programs and tuning to channels.
Brand: TOSHIBA, Model: 46WL768.
Briefly from the TV: LCD, LED backlight, 46 ", 1920x1080, 1080p Full HD, 3D, there is a satellite tuner, sound: 30W, HDMI connectors: 4, Internet access, Wi-Fi, Smart TV.
The official Toshiba website has firmware (software update) for models 46WL768G (17.3.24.12), 46WL768B (17.3.24.17).
The composition uses MainBoard PE0890 V28A001176A1 and an LCD panel (matrix) LTA460HQ06.
Technical description
TOSHIBA 46WL768 LED TV with LTA460HQ06 LCD display, 46 "(117 cm) diagonal size in 16: 9 format. The required screen brightness of 430 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 5000: 1 Dynamic contrast ratio of 7,000,000: 1 is achieved by special control of the LEDs' operation.This model uses side illumination from Edge LEDs.
There is support for 3D images with active (shutter) technology for separating the right and left channels. The design and technical capabilities of the TV include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphical decomposition according to the standard 1080p (Full HD).
The 46WL768 is equipped with SMART software, integrated applications and the ability to work on the Internet. Connecting to the Internet can be done via Wi-Fi. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
The power of the sound system 30 W (2x10 + 10 W) is provided by 3 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, component, SCART x2, RGB, VGA, HDMI x4, USB x2, Ethernet (RJ-45), Wi-Fi. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-S2 standards.
The power consumed by the TV in the operating mode from the network is 135 watts.
Overall dimensions: with stand 1092x735x288 mm, without stand 1092x663x29 mm.
TV Weight: with stand: 24.5 kg, without stand: 21.4 kg.
Attention! The TOSHIBA 46WL768 LED TV panel LTA460HQ06 is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.