Technical description and composition of the TOSHIBA 42L7453 TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 42L7453 42L7453RB
Chassis / Version: PE1168
Panel: 96.42S28.001
LED backlight: SVT420A81_REV03 R / L-TYPE130613
T-CON: V28A001510A1 PE1159
LED driver (backlight): integrated into PSU
PWM LED driver: OZ9912BTN
Power Supply (PSU): PSLF226A01A V71A00029501
MainBoard: PE1168 V28A001525A1
IC MainBoard: Hynix H5TQ4G63AFR-RDC, SOUND: TAS5760M, eMMC: THGBMAG5A1JBAIR
Tuner: RE232TN
Control: WLU5053-D4
Specifications 42L7453
TOSHIBA 42L7453
General repair guidelines for TV LCD LED
Possible malfunctions
- The TOSHIBA 42L7453 does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
Typically, with such manifestations, the defect is caused by faulty elements in the PSLF226A01A main power module. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, it is necessary to check the serviceability of power switches and rectifier diodes for possible breakdown (short circuit).
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually 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 the remote control. Or for a second, the image may appear immediately after switching on.
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.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
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). Board repair and chip replacement Hynix H5TQ4G63AFR-RDC, SOUND: TAS5760M are made with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be 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.
Owners and users of the TOSHIBA 42L7453 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!
Repair MainBoard
The appearance of MainBoard PE1168 is shown in the figure below:
PE1168
Main features of the TOSHIBA 42L7453 device:
Installed matrix (LED panel) 96.42S28.001.
The matrix control uses the Timing Controller (T-CON) V28A001510A1.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the OZ9912BTN PWM controller.
The formation of the necessary supply voltages for all nodes of the TOSHIBA 42L7453 TV is carried out by the PSLF226A01A power supply 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: 42L7453.
Briefly from the TV: LCD, LED backlight, 42 ", 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 42L7453DG (8.1.97.10.01.1), 42L7453DB (8.1.97.10.01.1).
The composition uses MainBoard PE1168 V28A001525A1 and an LCD panel (matrix) 96.42S28.001.
Power Supply Unit (PSU) PSLF226A01A V71A00029501 Power Supply.
TOSHIBA 42L7453 LED TV with 96.42S28.001 LCD, 42 "(107 cm) diagonal size in 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 42L7453 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 174 watts.
Overall dimensions: with stand 960x599x215 mm, without stand 960x560x89 mm.
TV Weight: with stand: 9.5 kg, without stand: 5.85 kg.
Attention! The TOSHIBA 42L7453 LED TV panel 96.42S28.001 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.