Technical description and composition of the TOSHIBA 46TL938 TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 46TL938
Chassis / Version: PE1091A
Panel: LTA460HW04 // T460HVN02.2
LED backlight: LJ07-00998A
LED driver (backlight): SSL460_3E1B REV: 0.1
PWM LED driver: SSL110SN
Power Supply (PSU): N150A002L REV: 01 N11-150P1A V71A00022901
PWM Power: A6069, FAN6961 (PFC), L6577B
MOSFET Power: K12A50D
MainBoard: PE1091 A V28A001434B1
IC MainBoard: MSD8881, K4B2G1646E, K4B1G1446G, TAS5708, W25Q16, M24C256, M24C08
Tuner: TDSS-G224D
Specifications 46TL938
TOSHIBA 46TL938
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The TOSHIBA 46TL938 TV does not turn on, does not respond to the remote control and control panel buttons, indicators do not light up and do not blink.
With similar manifestations, in some cases, the N150A002L power module is faulty. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (K12A50D) and rectifier diodes for a possible partial or complete breakdown.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM) A6069, FAN6961 (PFC), L6577B, if they do not have visible damage to the case and open fault between the terminals, are usually checked by replacement.
- 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.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
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. By opening the panel, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. 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 PE1091 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). When repairing an MB board, you need to check its components MSD8881, K4B2G1646E, K4B1G1446G, TAS5708. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
Before replacing the TDSS-G224D tuner, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Attention TV owners! Attempts at self-repair of TOSHIBA 46TL938 are not recommended by the manufacturer and can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> TOSHIBA 46TL938 Chassis PE1091A
FIRMWARE FOR SPI FLASH -----------> , EEPROM W25Q16, M24C256, M24C08 TOSHIBA 46TL938, Main: PE1091 A V28A001434B1, Panel: T460HVN02.2
Service Manuals with Schematic Diagrams 110 pages 2012 on Model 46TL938G
The appearance of MainBoard PE1091 is shown in the figure below:PE1091
PE1091 can be used in TVs:
TOSHIBA 40TL968 (Panel LTA400HV04), TOSHIBA 40TL938 40TL938G (Panel V400NK2-LS5).
The appearance of the power supply
Main features of the TOSHIBA 46TL938 device:
Installed matrix (LED-panel) LTA460HW04 or T460HVN02.2.
The LED driver SSL460_3E1B is used to power the backlight LEDs, it is controlled by the SSL110SN PWM controller.
The necessary supply voltages for all nodes of the TOSHIBA 46TL938 TV are generated by the power module N150A002L, or its analogs using microchips A6069, FAN6961 (PFC), L6577B and power switches of the type K12A50D.
MainBoard - the main board (motherboard) is a PE1091 module, using microchips MSD8881, K4B2G1646E, K4B1G1446G, TAS5708, W25Q16, M24C256, M24C08 and others.
The TDSS-G224D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA460HW04-001
Type: a-Si TFT-LCD, Panel
Diagonal size: 46 inch
Resolution: 1920x1080, FHD
Display Mode: SPVA, Normally Black, Transmissive
Active Area: 1018.08x572.67 mm
Display Colors: 1.07B (10-bit)
Frequency: 120Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (4 ch, 10-bit)
Brand: TOSHIBA, Model: 46TL938.
Briefly from the TV: LCD, LED backlight, 46 ", 1920x1080, 1080p Full HD, 3D, DVR, sound: 20W, HDMI: 4, Internet access, Wi-Fi, Smart TV.
On the official Toshiba website there are firmware (software updates) for models 46TL938G (7.0.28.16.1), 46TL938F (7.0.28.16.1).
The composition uses MainBoard PE1091 A V28A001434B1 and LCD-panel LTA460HW04, or T460HVN02.2.
Power Supply Unit (PSU) N150A002L REV: 01 N11-150P1A V71A00022901 Power Supply.
Technical description
TOSHIBA 46TL938 LED TV with LTA460HW04 LCD display, diagonal size 46 "(117 cm) in 16: 9 format. The required screen brightness of 400 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 1,000,000: 1 is achieved by special control of the LEDs. V This model uses side lighting 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 46TL938 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, Xvid, DivX, MKV, JPEG.
The power of the acoustic system of sound 20 W (2x10 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, VGA, HDMI x4, 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 standards.
The power consumed by the TV in the operating mode from the network is 146 watts.
Overall dimensions: with stand 1056x687x235 mm, without stand 1056x629x56 mm.
TV Weight: with stand: 18.5 kg, without stand: 15.9 kg.
Attention! The LTA460HW04 panel of the TOSHIBA 46TL938 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