Technical description and composition of the TOSHIBA 19KL933R TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 19KL933R
Chassis / Version: VESTEL 17MB62 19KL934R
Panel: LTA185AT01
LED driver (backlight): 75029680 PC BOARD ASSY, CONTROL, 23026343
Power Supply (PSU): 75029541 POWER MODULE, 22BL702B, 23023938
PWM Power: ICE3BR1765J (Standby), CAT7581 (8)
MOSFET Power: FDC642P (6), AO4802 (8)
MainBoard: 17MB62-2.5
IC MainBoard: SPI: W25Q80, NAND H27U518S2CTR
Tuner: SUT-RE216TN
Control: RC-1911/300070524
Specifications 19KL933
TOSHIBA 19KL933R
General repair guidelines for TV LCD LED
Possible malfunctions
- The TOSHIBA 19KL933R TV does not turn on, does not respond to the remote control and buttons on the control panel, the indicators do not light or flash.
With such manifestations, a malfunction is most likely to be detected in the power supply module 75029541. You should measure its output voltages and, if they are absent, check the power switches (FDC642P (6), AO4802 (8)) and rectifier diodes in the converters for possible breakdown.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers ICE3BR1765J (Standby), CAT7581 (8), in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
As a rule, in this case, the LED backlight turns out to be faulty. Usually the cause of the malfunction is in the breakage of the LEDs, or in the connectors of the LED strips, but sometimes the LED driver also turns out to be faulty.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as a health indicator. In faulty LEDs, the zener diode will either be cut off or broken into short-circuit.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the 17MB62-2.5 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its SPI chips: W25Q80, NAND H27U518S2CTR and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
The malfunction of the SUT-RE216TN tuner is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Attention to users! Self-repair of the TOSHIBA 19KL933R TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba chassis 17MB62-2 Service manual and schematic diagram
------------------> USB firmware (update) for 19KL933R with a text file from the official site. Files are unpacked with the path to a formatted USB flash drive. When turned on, press the OK button on the remote control.
------------------> USB firmware for 19KL933R with text and mboot.bin file for the bootloader in case of killed SPI - - v6_8c.rar.
FIRMWARE NAND K9F1208UOA firmware for 19KL933R as a last resort (more than 65 MB) ------------------> Toshiba 19KL933R_K9F1208UOA.rar
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).
Key Features of the TOSHIBA 19KL933R:
Installed matrix (LED panel) LTA185AT01.
The LED driver 75029680 is used to power the backlight LEDs.
The necessary supply voltages for all nodes of the TOSHIBA 19KL933R TV are generated by the power supply module 75029541 or its analogs using ICE3BR1765J (Standby), CAT7581 (8) microcircuits and power switches of the type FDC642P (6), AO4802 (8).
MainBoard - the main board (motherboard) is a 17MB62-2.5 module, using SPI chips: W25Q80, NAND H27U518S2CTR and others.
The SUT-RE216TN tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA185AT01
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 230 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6 (Tr + Td)
Frequency: 60Hz
Lamp Type: 21S1P WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
TOSHIBA 19KL933 LED TV with LTA185AT01 LCD display, 19 "(48 cm) diagonal size in 16: 9 format. The required screen brightness of 300 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, NT SC. 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 speaker system of sound 5 W (2x2.5 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 45 watts.
Overall dimensions: with stand 462x337x145 mm, without stand 462x299x54 mm.
TV Weight: with stand: 4.5 kg, without stand: 4 kg.
Attention! The LTA185AT01 panel of the TOSHIBA 19KL933 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.