Technical description and composition of the TOSHIBA 40VL733R TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 40VL733R
Panel: LTA400HF12 T04
T-CON: S120BM4C4LV0.7
LED driver (backlight): SSL460EL01 REV0.2
PWM LED driver: TL494I, HV9911NG
MOSFET LED driver: B11NK40Z, 6N40C, J41CG, 30NF20
Power Supply (PSU): DPS-165CP A
PWM Power: A6069H (7pin), SSC9502S (18pin), 1607B (PFC)
MOSFET Power: K6A60D
MainBoard: PE0840 V28A001113B
IC MainBoard: TMP91FW27UG TA5570B Si19287BGNU
Tuner: ENG37F04KF
Specifications 40VL733
TOSHIBA 40VL733R
General repair guidelines for TV LCD LED
Diagnostics of malfunctions and repairs of the TOSHIBA 40VL733R, as well as other electronic devices, is recommended to begin with an external examination of the external and internal elements. Using visible changes in the state of components, it is usually possible to determine the further direction of troubleshooting and localization of the defect before the necessary measurements are taken. In most cases, the repairman can guess the causes of the defect and possible consequences by the characteristic signs of typical TV defects, for example, ring cracks formed in the soldering of element leads, swollen rectifier filter capacitors, charred resistors and other circuit elements.
If the 40VL733R TV does not turn on, does not make any sounds when it is turned on, and also no indicators on the front panel light or blink - there is a high probability of a malfunction in the power supply module. In some cases, only the regulator or power converter of the control processor may be faulty, which is typical for some TOSHIBA models. Diagnostics and repair of the common power supply should always begin with a check of the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the rectifier network, as well as the large electrolytic capacitor of the filter of the rectifier network.
Power switches in pulsed power supplies (SMPS) fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The reason may be a malfunction of the PWM controller chip A8069H (8), which can only be checked by replacing it with a new or obviously working one.
If, when you turn on the TV, the image appears and immediately disappears, or is missing initially when you turn on, but the sound has other functions that work, there is a high probability of a malfunction of the LED driver (power converter for the backlight LEDs of the panel LTA400HF12 T04). In such cases, the general power module is also subject to verification, in which the electrolytic capacitors of the rectifier filter supplying the LED driver should be checked.
Often there is a need for disassembling the panel to check the health of the LEDs, as well as contact connections in the connectors and soldering.
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.
The motherboard PE0840 V28A001113B must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up continuously. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary.
Before replacing the ENG37F04KF tuner, if there is no tuning to the channels, you must first check the supply voltage at its terminals, including the varicap supply (30-33V).
Remember! Attempts to self-repair by users of the TOSHIBA 40VL733R TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> 32/40/46XV733 main PE0840
The appearance of MainBoard PE0840 is shown in the figure below:PE0840
PE0840 can be used in TVs:
TOSHIBA 40SL733G (Panel LTA400HF12), TOSHIBA 32SL733R (Panel LTA320HF02 75018259 LCD PANEL LED), TOSHIBA 32XV733 (Panel LC320WUD (SC)(G1)), TOSHIBA 40VL733R (Panel LTA400HF12 T04), TOSHIBA 46XV733R (Panel LTA460HJ04 T03).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the DPS-165CP module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the 1607B PWM controller. The reactance of an electrolytic capacitor of a line filter at a frequency of 50-60 Hz is usually not more than 20-30 ohms and its charge directly from the network through open diodes could reach tens of amperes per pulse if no filtering were applied.
As a result of the PFC conversion, an increased voltage on the capacitor (about 380V) cannot directly open the rectifier diodes, on the anode of which the voltage will always be slightly less (about 300V) and then its charging current will always be limited by the elements of the PWM controller. As a result, the envelope of the high-frequency pulses of the consumed current will repeat the shape and phase of the input sinusoidal voltage. The presence of an increased voltage (+ 380V) on the network capacitor indicates the serviceability of the PFC node.
Main features of the TOSHIBA 40VL733R device:
Installed matrix (LED-panel) LTA400HF12 T04.
The matrix control uses the Timing Controller (T-CON) S120BM4C4LV0.7.
The LED driver SSL460EL01 is used to power the backlight LEDs, it is controlled by the PWM controller TL494I, HV9911NG. As the power elements of the LED driver, keys of the type B11NK40Z, 6N40C, J41CG, 30NF20 are used.
The necessary supply voltages for all nodes of the TOSHIBA 40VL733R TV are generated by the DPS-165CP power module or its analogs using A6069H (7pin), SSC9502S (18pin), 1607B (PFC) microcircuits and K6A60D type power switches.
MainBoard - the main board (motherboard) is a PE0840 module, using TMP91FW27UG TA5570B Si19287BGNU chips and others.
The ENG37F04KF tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA400HF12-T02
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 885.6x498.15 mm
Frequency: 120Hz
Lamp Type: WLED
Brand: TOSHIBA, Model: 40VL733.
Briefly from the TV: LCD, LED backlight, 40 ", 1920x1080, 1080p Full HD, sound: 20W, HDMI: 4, Internet access, Wi-Fi.
The official Toshiba website has firmware (software update) for the models 40VL733G (10.1.59.6), 40VL733F (10.1.41.9), 40VL733B (10.1.59.5).
The composition includes MainBoard PE0840 V28A001113B and LCD panel (matrix) LTA400HF12 T04.
Power Supply Unit (PSU) DPS-165CP A Power Supply.
TOSHIBA 40VL733 LED TV with an LTA400HF12 LCD, 40 "(102 cm) diagonal size 16: 9 format. The required screen brightness of 450 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 5,000,000: 1 is achieved by special control of the LEDs. V This model’s display manufacturing technology uses LED LED backlighting, and the TV’s design and technical capabilities provide for watching broadcasts and films in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the 1080p standard (Full HD). The high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, MPEG4, JPEG.
The power of the sound system 20 W (2x10 W) provides 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 x2, RGB, VGA, HDMI x4, USB x2, Ethernet (RJ-45), Wi-Fi. 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.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C standards.
TV Weight: 19 kg.
Attention! The panel of the TOSHIBA 40VL733 LTA400HF12 T04 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.