Technical description and composition of the TOSHIBA 55L7453 TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 55L7453 55L7453RB
Chassis / Version: PE1168
Panel: 96.55S03.001
LED backlight: SVT550AA0_REV04 L / R-TYPE 130710
T-CON: V28A001510A1, 6870C-0482A
LED driver (backlight): integrated into PSU
Power Supply (PSU): B55D-2LE V71A000293A0 AC20282LF-1
MainBoard: PE1168 C V28A001525A1
IC MainBoard: Hynix H5TQ4G63AFR-RDC, SOUND: TAS5760M, eMMC: THGBMAG5A1JBAIR
Tuner: RE232TN
Control: IR: V28A001503A1, WiFi: V86A00021200 WLU5053-D4 (ROHS)
Specifications 55L7453
TOSHIBA 55L7453
General repair guidelines for TV LCD LED
Possible malfunctions
- The TOSHIBA 55L7453 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.
In some of these cases, the main switching power supply, the B55D-2LE module, turns out to be faulty. It is necessary to measure its output voltages and, if they are absent, to check for short-circuit probabilities in the converters, power switches and rectifier diodes.
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, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
In some of these cases, the malfunction is caused by a lack of backlighting on the display. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
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 PE1168 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - Hynix H5TQ4G63AFR-RDC, SOUND: TAS5760M, eMMC: THGBMAG5A1JBAIR with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If there is no reception of television channels, but the TV is working properly from external devices, first of all, check the voltage of the tuner RE232TN and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Attention to users! Self-repair of the TOSHIBA 55L7453 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
The appearance of MainBoard PE1168 is shown in the figure below:PE1168
The appearance of the power supply
Main features of the TOSHIBA 55L7453 device:
Installed matrix (LED-panel) 96.55S03.001.
The matrix control uses the Timing Controller (T-CON) V28A001510A1.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the TOSHIBA 55L7453 TV is carried out by the B55D-2LE power module, or its analogs.
MainBoard - the main board (motherboard) is a PE1168 module, using Hynix H5TQ4G63AFR-RDC chips, SOUND: TAS5760M, eMMC: THGBMAG5A1JBAIR and others.
The RE232TN tuner provides TV reception and channel tuning.
Brand: TOSHIBA, Model: 55L7453.
Shortly from the TV: LCD, LED backlight, 55 ", 1920x1080, 1080p Full HD, 3D, DVR, sound: 30W, HDMI connectors: 4, Internet access, Wi-Fi, Smart TV.
The official Toshiba website has firmware (software update) for the models 55L7453DG (8.1.97.10.01.1), 55L7453DB (81.97.10.01.1).
The composition uses MainBoard PE1168 C V28A001525A1 and LCD-panel 96.55S03.001.
Power Supply Unit (PSU) V71A000293A0 AC20282LF-1 B55D-2LE Power Supply.
Technical description
TOSHIBA 55L7453 LED TV with 96.55S03.001 LCD, 55 "(140 cm) diagonal, 16: 9 format. The required brightness of the screen is 700 cd / m² with LED backlight LED. The ratio of maximum brightness to minimum (contrast) is 1600: 1. Dynamic contrast ratio of 7,000,000: 1 is achieved by special control of the LEDs, and LED display technology is implemented in the display technology of this model.
There is support for 3D images using passive polarization technology. 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 55L7453 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, 2160p. Supported media file formats: MP3, WMA, MPEG4, Xvid, MKV, JPEG.
Sound power 30 W (2x15 W) provide 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, component, SCART, RGB, HDMI x4, MHL, USB x2, Ethernet (RJ-45), Wi-Fi, WiDi. An output for connecting headphones is provided. 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-T2 standards.
The power consumed by the TV in the operating mode from the network is 182 watts.
Overall dimensions: with stand 1071x498x215 mm, without stand 1071x453x89 mm.
TV Weight: with stand: 13.5 kg, without stand: 12.3 kg.
Attention! The TOSHIBA 55L7453 LED TV panel 96.55S03.001 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.