Technical description and composition of the TOSHIBA 40L7356RK TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 40L7356RK
Chassis / Version: L4300
Panel: LSC400HF03 T01 // 96.40S03.003
T-CON: 13Y_S120PMB4C2LV0.2
LED driver (backlight): B191-203 D21 REV.D
Power Supply (PSU): B191-203 D21 REV.D
MainBoard: 32L4300 REV1.02
IC MainBoard: CPU: MSD8881CV-W9N; DRAM: H5TQ2G63DFR; NAND Flash: THGBM4G4D1HBAIR; SPI Flash: / W25Q16CVSSIG;
Tuner: TDSS-G231D
Control: CT-90430 two eyes 75034819 04AD-00KF0TB
Specifications 40L7356RK
TOSHIBA 40L7356RK
General repair guidelines for TV LCD LED
Repair and diagnostics of any electronic device, in particular TOSHIBA 40L7356RK, it is advisable to start with a careful external examination of internal and external elements. Specific external damage to some elements can sometimes indicate further actions to determine the malfunction of the TV and localize the defect before the necessary measurements are taken. If charred resistors, swollen electrolytic or cermet capacitors, ring cracks in the solders of the terminals of transformers or heating elements are found, it is advisable to establish the causes and consequences of the malfunction that has arisen, as well as to check the connected elements and assemblies.
In the case when the 40L7356RK does not turn on, does not respond to the remote control and the front panel buttons, does not blink bulbs and does not show any signs of operability, the power supply module B191-203 D21 REV.D is probably faulty in this case. If it is serviceable under such manifestations, it is necessary to check the power supply stabilizer (converter) of the processor on the motherboard.When diagnosing and repairing the power supply, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. When it is broken, the power elements of transistors and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
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 PWM controller chip can also cause a breakdown of the power switch of the converter.
If there is no image when you turn on the TOSHIBA 40L7356RK, or it appears for a second and disappears, but there is sound, most likely there is a malfunction in the backlight LED circuit of the 96.40S03.003 panel, or in their power converter. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit.
A malfunction in the backlight circuits often occurs due to an open in the power circuit of the LED lines. It requires disassembling the panel and checking the LEDs themselves, the rations of their terminals, as well as the reliability of the connections in the connectors and rations of the terminals.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source.
Diagnosis and repair of the 32L4300 REV1.02 motherboard is carried out by checking the performance of the stabilizers or power converters of the module chips. In some cases, a software update is required.
If you suspect a malfunction of the TDSS-G231D tuner, first of all, you need to make sure that the voltage of the varicaps (30-33V) is on the corresponding output of the tuner, as well as other voltage supplying it.
We recommend the owners of the 40L7356RK TV for repair only to qualified specialists with experience! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 32L4332/L4333, 39/50/L4333, 32/39/50/L4353, 32/39/50/L4363, 40/50/L6353, 40/50/L6363, 40/50/58/L7333, 40/50/58/L7353, 40/50/58/L7363, Chassis L4300
The appearance of the MainBoard 32L4300 is shown in the figure below:32L4300
32L4300 can be used in TVs:
TOSHIBA 32L4353RB (Panel T320HVN04), TOSHIBA 39L4353RB (Panel T390HVN01.0 / XL), TOSHIBA 40L6353RK (Panel LSC400HM06 T01), TOSHIBA 40L7356RK (Panel LSC400HF03 T01), TOSHIBA 40L7363RK (Panel LSC400HF03 T01), TOSHIBA 50L7363RK (Panel 50 inch), TOSHIBA 32L6353RK (Panel 96.32S14.001), TOSHIBA 39L4363D (Panel T390HVN01.0 XL), TOSHIBA 50L4353RK (Panel LC500DUE (SF)(R1)).
Main features of the TOSHIBA 40L7356RK device:
Installed matrix (LED-panel) LSC400HF03 T01 or 96.40S03.003.
The matrix control uses the Timing Controller (T-CON) 13Y_S120PMB4C2LV0.2.
The LED driver B191-203 is used to power the backlight LEDs.
The formation of the necessary supply voltages for all nodes of the TOSHIBA 40L7356RK TV is carried out by the power module B191-203, or its analogues.
MainBoard - the main board (motherboard) is a 32L4300 module using CPU chips: MSD8881CV-W9N; DRAM: H5TQ2G63DFR; NAND Flash: THGBM4G4D1HBAIR; SPI Flash: / W25Q16CVSSIG; and others.
The TDSS-G231D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LSC400HF03
Type: a-Si TFT-LCD, CELL
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: SPVA, Normally Black, Transmissive
Active Area: 885.6x498.15 mm
Surface: Antiglare (Haze 2.3%), Hard coating (2H)
Glass Depth: 0.70 + 0.70 mm
Transmissivity: 5.1% (with Polarizer)
Contrast Ratio: 5000: 1
Display Colors: 1.07B (10-bit), CIE1931 72%
Response Time: 6 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 10-bit), 51 pins
Voltage: 12.0V
Brand: TOSHIBA, Model: 40L7356RK.
Briefly from the TV: LCD, LED backlight, 40 ", 1920x1080, 1080p Full HD, 3D, sound: 20W, HDMI: 4, Internet access, Wi-Fi, Smart TV.
For the 40L7356RK model, the official website has firmware (software update) version 7.1.90.34.01.1.
The composition includes MainBoard 32L4300 REV1.02 and LCD panel (matrix) LSC400HF03 T01.
Power Supply Unit (PSU) B191-203 D21 REV.D Power Supply.
TOSHIBA 40L7356RK LED TV with LSC400HF03 LCD, 40 "(102 cm) diagonal size, 16: 9 format. The required screen brightness of 300 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 40L7356RK 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 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, MKV, JPEG.
The power of the acoustic system of sound 20 W (2x10 W) provide two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), component, SCART, RGB, VGA, HDMI x4, USB x2, Ethernet (RJ-45), Wi-Fi, WiDi, Miracast. 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.
Overall dimensions: with stand 992x600x182 mm, without stand 992x559x76 mm.
TV mass: without stand: 10.5 kg.
Attention! The LSC400HF03 T01 panel of the TOSHIBA 40L7356RK LED TV 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.