Technical description and composition of the TOSHIBA 32W3453R TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 32W3453R
Chassis / Version: 17MB95
Panel: VES315WNDL-01
LED backlight: VESTEL 32inch REV0.2 TIS-4A
T-CON: 6870C-0442B - 32-37 R0W2.1 HD VER 0.1
LED driver (backlight): integrated into PSU
PWM LED driver: MP3394
MOSFET LED driver: FQD7N10L
Power Supply (PSU): 17IPS11 300413-R4 23110481
PWM Power: SG6742HR
MOSFET Power: FQPF9N50C
MainBoard: 17MB95 R3 050413, 23146996-19567, 23146995
IC MainBoard: MSD8WB9BX, MX25L1605A, 25Q80, H27U2G8F2CTR, TAS5719
Tuner: SI2156
Control: CT-8035, IR: 17LD150, WI-F: 17WFM03. TWFM-L001D
Specifications 32W3453
TOSHIBA 32W3453R
General repair guidelines for TV LCD LED
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when it is turned on, there is a certain chance that the 17IPS11 300413-R4 23110481 power supply module is defective and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of standby power. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
The breakdown of the power switch of the pulse converter is often triggered by other elements, for example, in the stabilization or control circuits of this switch, as well as by the damper elements in its drain and TPI winding.
Sometimes the TOSHIBA 32W3453R TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a possibility of a malfunction of the LED driver - the power converter of the backlight LEDs of the VES315WNDL-01 panel, or a break in the LED circuit is possible. In such cases, first of all, it is necessary to verify the operability of the electrolytic capacitors of the filter by the power of the backlight unit.
The lack of backlight often occurs due to an open circuit in the LED circuit. There is a need for disassembling the panel and checking the LEDs themselves, as well as the same contact connections in the connectors and rations of the terminals.
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. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). 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.
Repair or diagnostics of the motherboard 17MB95 R3 050413, 23146996-19567, 23146995 should begin by checking the stabilizers and power converters needed to power the microcircuits and matrix. If necessary, you should update the software (software).
In some cases, it is necessary to check or replace (if necessary) the elements of the MB board (SSB) - MSD8WB9BX, MX25L1605A, 25Q80, H27U2G8F2CTR, TAS5719. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
If you suspect a malfunction of the SI2156 tuner, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary voltage levels and pulses of data exchange with the processor via the I2C bus at the corresponding terminals of the tuner.
Attention to users! Self-repair of a TOSHIBA 32W3453R TV without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba - Vestel Main 17MB95
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Vestel 17IPS11 schematic diagram
TV LED IC MP3394/MPS3394S LED Driver Diagnostics Throubleshooting
The earlier MP3394 was replaced by MPS3394S, which is an upgraded version of the same IC, and found in the 17IPS20 power supply board. It is the main heart of the backlighting LED drive and the failure of this IC can cause the TV not to start. This is a voltage step-up IC that takes 5-V to 28-V at its input pin 15 (Vin) and raises it to drive four independent strings of LEDs. It also performs other functions such as voltage regulation between the LED strings, and provides a dimming facility using pulse-width modulation (PWM). An important aspect of this IC is that it has built-in open and short LED protection circuitry. It is also able to sense the current and voltage of the LED matrix load and determine abnormal conditions. That means that if all the LEDs in the matrix go open or short, it will prevent the television from switching ON.
The IC has internal control logic that produces the GATE signal to drive an external MOSFET transistor. This is the transistor that is switched against an inductor to step-up the voltage, and the gate signal is produced only when the internal control logic detects normal conditions. It is able to determine normal/abnormal conditions through internal comparators, and one such is the LED Over-Voltage Protection (LED OVP) comparator that provides Short String Protection (SSP).
When the TV is switched ON, this IC is enabled through pin 2, by a voltage greater than 1.8-V. It first checks the circuit configuration, and then checks the over-voltage protection signal at (pin 12) to determine if the rectifier diode is open and whether the booster MOSFET (driven by the GATE signal) is short to ground. If the OVP voltage at pin 12 is lower than 70-mV (may be different for other board versions), then it disables itself and the TV will not start.
On the 17IPS20 board, the GATE signal is known as GATE_LED, which drives a bi-polar junction transistor (BJT) Q500 (BC858B). This transistor then drives Q502/Q503 MOSFET booster group of transistors to step-up the voltage (shown in the following pages of this article). In this circuit configuration the inductance coils are L500 and L501. The high voltage produced then goes into a group of rectifier diodes D503 and D504 producing a positive DC voltage for the LEDs. The over voltage protection signal is known as OVP_LED. Whilst all the LED strings take their power from this positive voltage source, they all have separate independent drain pins through the MPS3394S controller IC.
There are also other parameters to consider such as Under-Voltage Lock-Out (UVLO), which is determined by measuring the rising-edge of Vin. This parameter has to be between 3.5-V and 4.4-V, with 3.9-V being the typical value. It is a very clever IC as it can also detect open and short LED strings in the backlight array.
Although this diagnostic cannot tell you the condition of each individual diode, it can indicate the condition of each string of diodes in the backlight matrix. The MPS3394S IC (SOIC16 package) drives four separate strings of LEDs through dedicated open drain output pins. LED string 1 is driven by pin 11, LED string 2 by pin 10, LED string 3 by pin 9, and LED string 4 by pin 8. It also monitors the voltages at these pins so that if there was a shorted LED in one of the strings then it would disconnect that string. If the voltage at any of these pins is greater than 6.1-V, then this condition triggers the short circuit protection mechanism for disconnecting the string at that pin. It is also possible to determine an open string, and in this case, this condition is detected when the pin voltage is lower than 196-mV.
Interestingly, this IC is designed such that it will always try to light at least one string if it is working. The only time when the step-up converter shuts-down completely is if all the strings were either open, or short. Therefore, before you rush off to eBay to buy a new chip, measure the voltages at these pins to make sure that the diodes are not faulty. Otherwise, you will end up wasting a lot of time and money!
To reduce the backlight current in LED drivers with the MP3394S (MP3394) controller, increase the resistance of the resistor from pin 6 (ISET) to the chassis. The maximum current in each channel (in milliamperes) for the Rset resistor (in kilo-ohms) is determined from the ratio 790 * 1.23V / (Rset + 0.4).Repair MainBoard
The appearance of the MainBoard 17MB95 is shown in the figure below:
17MB95
17MB95 can be used in TVs:
HYUNDAI DLH-32285 (Panel VES315WNDS-01), PHILIPS 40PFL3018T/12 (Panel VES400UNDS-01), PHILIPS 40PFL3008H/12 (Panel VES400UNDS-03), TELEFUNKEN L32H125A3 (Panel VES315WNEA-01-B), TOSHIBA 22L1353R (Panel LM215WF4), TOSHIBA 22L1354R (Panel LM215WF4 TL G1), TOSHIBA 40L1353N (Panel LTA400HM23), TOSHIBA 40L3453R (Panel VES400UNDS-02-B), TOSHIBA 32W3453R (Panel VES315WNDL-01), TOSHIBA 40L5455R (Panel VES400UNVS-3D-N01), TOSHIBA 40L5435 40L5435DG (Panel VES400UNVS-3D-N01).
The appearance of the power supply
Main features of the TOSHIBA 32W3453R device:
Installed matrix (LED-panel) VES315WNDL-01.
The matrix control uses the Timing Controller (T-CON) 6870C-0442B.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the MP3394 PWM controller. As power elements of the LED driver, keys of the FQD7N10L type are used.
The necessary supply voltages for all nodes of the TOSHIBA 32W3453R TV are generated by the 17IPS11 power supply module or its analogs using SG6742HR microcircuits and power switches of the FQPF9N50C type.
MainBoard - the main board (motherboard) is a 17MB95 module, using microchips MSD8WB9BX, MX25L1605A, 25Q80, H27U2G8F2CTR, TAS5719 and others.
The SI2156 tuner provides TV reception and channel tuning.
Brand: TOSHIBA, Model: 32W3453.
Briefly from the TV: LCD, LED backlight, 32 ", 1366x768, 720p HD, sound: 20W, HDMI: 2, Internet access, Wi-Fi, Smart TV.
For the 32W3453DB model, the official website has firmware (software update) version V3.5.5F.
The composition uses MainBoard 17MB95 R3, 23146996-19567, 23146995 and the LCD panel (matrix) VES315WNDL-01.
Power Supply Unit (PSU) 17IPS11 300413-R4 23110481 Power Supply.
TOSHIBA 32W3453 LED TV with VES315WNDL-01 LCD display, 32 "(81 cm) diagonal in 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 1400 : 1. The LCD panel uses backlighting from Direct LEDs. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready).
The 32W3453 is equipped with SMART software, built-in 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, DivX, MKV, JPEG.
The power of the sound system 20 W (2x10 W) provides 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, component, SCART, RGB, HDMI x2, 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.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
The power consumed by the TV in the operating mode from the network is 86 watts.
Overall dimensions: with stand 750x500x210 mm, without stand 750x460x100 mm.
TV Weight: 8.5 kg.
Attention! The VES315WNDL-01 panel of the TOSHIBA 32W3453 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.
