Technical description and composition of the TOSHIBA 32S1750EV TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 32S1750EV
Chassis / Version: MSD3463-T4C1
Panel: K320WD82
T-CON: 6870C-0442B; TL2357ML
LED driver (backlight): integrated into MainBoard
PWM LED driver: OB3350CP
Power Supply (PSU): integrated into MainBoard
MainBoard: MSD3463-T4C1
IC MainBoard: SPI Flash: MX25L6406E
Specifications 32S1750EV
TOSHIBA 32S1750EV
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The TOSHIBA 32S1750EV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
In such cases, the AC / DC voltage converter, which is combined with the main board MSD3463-T4C1, is often faulty. It is necessary to measure its output voltages, and in case of their absence, check the operability of the power switches of the converters and rectifier diodes for the probability of a short circuit.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- 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
In such cases, the most likely malfunction of the LED backlight elements. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
- 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 motherboard MSD3463-T4C1 should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Board repair and replacement of SPI Flash chips: MX25L6406E are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
Once again, remind users! Attempts to independently repair the TOSHIBA 32S1750EV TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 32S1750EV, Main: MSD3463-T4C1, Panel: K320WD82
The appearance of the MainBoard MSD3463-T4C1 is shown in the figure below:MSD3463-T4C1
Key Features of the TOSHIBA 32S1750EV:
Installed matrix (LED-panel) K320WD82.
The matrix control uses the Timing Controller (T-CON) 6870C-0442B ;.
To power the backlight LEDs, a converter is used, combined with the main board MSD3463-T4C1, controlled by the OB3350CP PWM controller.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit.
MainBoard - the main board (motherboard) is an MSD3463-T4C1 module, using SPI Flash chips: MX25L6406E and others.
Brand: TOSHIBA, Model: 32S1750EV.
Briefly from the TV: LCD, LED backlight, 32 ", 1366x768, 720p HD, DVR, there is a satellite tuner, sound: 12 W, HDMI connectors: 2.
The composition uses MainBoard MSD3463-T4C1 and LCD-panel K320WD8. The power supply is combined with the MainBoard.
TOSHIBA 32S1750EV LED TV with K320WD8 LCD display, 32 "(81 cm) diagonal size in 16: 9 format. The required brightness of the screen is 240 cd / m² LED backlight. The ratio of maximum brightness to minimum (contrast) is 1200: 1 The LED display is implemented in the manufacturing technology of this model’s display, and HD images can be viewed in high resolution at 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
The power of the sound system 12 W (2x6 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, VGA, HDMI x2, MHL, USB. An output for connecting headphones is provided.
The digital tuner is capable of receiving television channels in the standards DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2.
Overall dimensions: 730x466x176 mm.
TV Weight: 4 kg.
Attention! The K320WD8 panel of the TOSHIBA 32S1750EV 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.