Technical description and composition of the TOSHIBA 26KL933R TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 26KL933R
Chassis / Version: 17MB62-2.5
Panel: LC260EXN (SD) (A3)
PWM LED driver: SSL110SN
Power Supply (PSU): 17IPS19-3
PWM Power: SG6742HR (8 pin), ICE3BR0665J (Standby), NCP1579
MOSFET Power: FQPFN50C, AO4842
MainBoard: 17MB62-2.5
IC MainBoard: Nand Flash: NAND512W3A2SN6, SPI W25Q64
Tuner: SUT-RE216TN
Specifications 26KL933
TOSHIBA 26KL933R
General repair guidelines for TV LCD LED
Diagnostics of malfunctions and repairs of the TOSHIBA 26KL933R, as well as other electronic devices, it is recommended to start with an external examination of the external and internal elements. Sometimes, based on visible changes in the components of the device, it is possible to draw some conclusions and determine the direction of further troubleshooting even before the necessary measurements are taken. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
Faults in the ICE3BR0665J power supply module can be expressed in different ways, for example, the TOSHIBA 26KL933R does not turn on at all and the control lamps on its front panel do not light up and do not blink, and there are no signs of operability. It should be noted that with the same external manifestations, the processor power regulator (converter) may be faulty. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and the electrolytic capacitors of the filters of the converter secondary rectifiers. In the event of a fuse breaking, the reason should be sought in the power semiconductor elements of the pulse converter of the main power supply. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power switch (s) of the converter.
As a rule, the keys in switching power supplies (SMPS) are reliable enough and rarely fail for no reason to be looked for by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
If the TOSHIBA 26KL933R does not have an image, but there is sound, there may be a malfunction of the panel backlight LEDs or their power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
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.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes.
The 17MB62-2.5 motherboard must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up constantly. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary.
In some cases, they require checking or replacing (if necessary) the elements of the MB board (SSB) - Nand Flash: NAND512W3A2SN6, SPI W25Q64. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
If the TV works normally from external devices, but does not tune into television channels, the SUT-RE216TN tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals, as well as the power supply of varicaps (30-33V).
Attention to the owners! Attempts to self-repair the TOSHIBA 26KL933R TV are not recommended by the manufacturer and can lead to serious negative consequences!
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 26KL933R, Main: 17MB62-2.5, Panel: .
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> 17IPS19-4 Power Supply Schematic Diagram
Software update 26KL933R (0.6.8c) can be downloaded here
The appearance of the MainBoard 17MB62-2.5 is shown in the figure below:The 17MB62-2.5 motherboard is made using the MSD9WB9PT-2 processor, combined with a scaler. For its operation, random-access memory (DDR) K4T1G164QF, or HY5PS121621C, and NAND512-A read-only memory (ROM) are used. To ensure processor power, DC / DC converters with output voltages of 1.2V, 2.5V, 3.3V are used. For DDR, the voltage is 1.8V, for NAND it is either 1.8 or 3.3V. It is advisable to start the repair by checking the supply voltage in stand-by mode (12V), 5V and 3.3V. Further, in the operating mode, it is necessary to check the operability of all linear stabilizers and DC / DC voltage converters used to power the MB and LCD panel chips. If there is a backlight and no image, depending on the type of panel used, its 5V or 12V power supply can be measured directly on the LVDS connector.
A typical malfunction of this board is a NAND software failure. At the same time, the TV does not turn on and blinks alternately with indicators on the panel. If the software of the SPI FLASH chip, in which the bootloader is located, is not damaged, NAND is updated via the USB port with standard software. Otherwise, it makes sense to try downloading the software if there is a mboot.bin file on the media, which can be used as standard SPI FLASH content.
17MB62-2.5 can be used in TVs:
TOSHIBA 19KL933R (Panel LTA185AT01), TOSHIBA 32KL933R (Panel LTA320AN12 T01), TOSHIBA 26KL933R (Panel LC260EXN (SD)(A3)), TOSHIBA 23KL933R (Panel LTM230HT10).
PSU Advanced
The 17IPS19-3 power supply module is made using the Power Factor Correction (PFC) scheme to filter the higher harmonics of the alternating current introduced by the device into the mains. The PFC node is a Step-Up Converter based on the ICE3BR0665J PWM controller, which evenly distributes high-frequency pulses of the charge current of the electrolytic capacitor of the rectifier filter of the left voltage evenly over a period of 50 Hz. As a result, the change in the amplitude of the pulses (envelope) of the consumed current repeats a sinusoidal shape.
The appearance of the power supply
Main features of the TOSHIBA 26KL933R device:
Installed matrix (LED-panel) LC260EXN (SD) (A3).
A converter controlled by the SSL110SN PWM controller is used to power the backlight LEDs.
The necessary supply voltages for all nodes of the TOSHIBA 26KL933R TV are generated by the 17IPS19-3 power supply module or its analogs using SG6742HR (8 pin), ICE3BR0665J (Standby), NCP1579 microcircuits and power switches of the FQPFN50C, AO4842 type.
MainBoard - the main board (motherboard) is a 17MB62-2.5 module, using Nand Flash chips: NAND512W3A2SN6, SPI W25Q64 and others.
The SUT-RE216TN tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC260EXN-SDA3
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 350 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
TOSHIBA 26KL933 LED TV with LC260EXN LCD display, 26 "(66 cm) diagonal size in 16: 9 format. The required screen brightness of 350 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 3000000: 1 is achieved by special control of the LEDs. V This model uses side illumination from Edge LEDs. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard for graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog 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, DivX, MKV, VideoCD, SVCD, Picture CD, JPEG.
The power of the sound system 10 W (2x5 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), AV, SCART, RGB, VGA, HDMI x2, USB. 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 65 watts.
Overall dimensions: with stand 644x447x175 mm, without stand 644x408x59 mm.
TV Weight: with stand: 8 kg, without stand: 6.9 kg.
Attention! The TOSHIBA 26KL933 LED TV panel LC260EXN (SD) (A3) 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.