Technical description and composition of the TOSHIBA 32DL833R TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 32DL833R 32DL834R
Chassis / Version: 17MB60-3.1main
Panel: LC320EXN SD A2 led
LED backlight: 3660L-0386A, LG lnnotek V6 32INCH HD L-Type / R-Type Rev 0.0 20101104
LED driver (backlight): 6917L-0072A PPW LE32GD-O (B) Rev0.1
PWM LED driver: BD9262EFV
MOSFET LED driver: DB30AX
Power Supply (PSU): 17PW07-2
PWM Power: FAN7621 (PWM resonant), FAN7529 (PFC), FSDL321 (Standby), NCP1579 (Step-Down)
MOSFET Power: FQPFN50C, AO4842
MainBoard: 17MB60-4 .1 20567221 75025776, DVD 75026264
IC MainBoard: RT8293AH (8), TPA3113D2, 4558CM, 9EBG 449 (6)
Tuner: DTOS403LH122E
Control: CT-8023
Specifications 32DL833
TOSHIBA 32DL833R
General repair guidelines for TV LCD LED
Repair of the TOSHIBA 32DL833R, 32DL834R TV should begin with a fault diagnosis, which involves a careful examination of the external and internal elements of the device. Often, by the external signs and nature of the damage to the elements, it becomes possible to draw some conclusions and determine a further algorithm for finding a defect before making the necessary measurements at control points. If charred resistors, swollen electrolytic or cermet capacitors, ring cracks in the solders of the terminals of transformers or heating elements are found, it is advisable to establish the causes and consequences of the malfunction that has arisen, as well as to check the connected elements and assemblies.
In the case when the 32DL833R does not turn on, does not respond to the remote control and buttons on the front panel, does not blink lights and does not show any signs of operability, the power supply module 17PW07-2 is probably faulty in this case. If it is serviceable with such manifestations, it is necessary to check the stabilizer (converter) of the processor power supply on the motherboard. Diagnostics and repair of the general power supply unit should always begin by checking the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the rectifier network, as well as the large electrolytic capacitor of the filter of the rectifier network.
The reasons for the breakdown of the power switch in pulsed power supplies (IIPS) can be different, for example, a malfunction of semiconductor cells or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the Q211 PWM controller dezh BP 8pin or breakage of the resistors in its bundle.
Sometimes the TOSHIBA 32DL833R TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the LC320EXN SD A2 led backlight converter, or an open circuit in the LED circuit is possible. In such cases, first of all, it is necessary to verify the serviceability of all the electrolytic capacitors of the filter by supplying the LED driver itself, including in the power supply unit (power supply unit).
Often in the absence of backlighting, disassembling the panel is required. It is necessary to check the serviceability of the transitions of the LEDs, as well as the reliability of the contact connections in the rulers and connectors.
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 motherboard 17MB60-4.1 20567221 75025776, DVD 75026264 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.
Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements RT8293AH (8), TPA3113D2, 4558CM, 9EBG 449 (6) requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can be diagnosed by warming up.
Before replacing the DTOS403LH122E tuner, if there is no tuning to the channels, you must first check the supply voltage at its terminals, including the power supply of varicaps (30-33V).
Once again, remind users! Attempts to independently repair the TOSHIBA 32DL833R TV without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 32DL833R chassis 17MB60-3 Service manual and schematic diagram
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Power Vestel 117PW07-2 Schematic diagram.
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 32DL833R 32DL834R, Main: 17MB60-3.1
To reduce the backlight current in LED drivers with the BD9262EFV controller, the total resistance of the resistors from terminal 23 (ISET) to the housing should be proportionally increased.
Repair MainBoard
The appearance of the MainBoard 17MB60-4 is shown in the figure below:
The 17MB60-4 motherboard is made using the MSD9WB7PX-2 processor, combined with a scaler. For its work, two microchips of external random access memory (DDR) HY5PS121621C and read-only memory (ROM) NAND512-A are used. To ensure processor power, stabilizers 1.2V, 2.5V, 3.3V are used. For DDR, the voltage is 1.8V, for the power of NAND 3.3V. It is advisable to start the repair by checking the power supply of the standby mode 3.3V. Further, in the operating mode, it is necessary to check the operability of all linear stabilizers and voltage converters. If there is a backlight and no image, the power of the LCD panel 5V or 12V, depending on the type of panel used, can be measured directly on the LVDS connector. A typical malfunction is a NAND ROM software failure. At the same time, the TV does not turn on and the indicators on the panel blink. It is updated via the USB port if the software of the SPI FLASH chip in which the bootloader is located is not damaged, or if there is a mboot.bin file on the media, which can be used as standard SPI FLASH content.
17MB60-4 can be used in TVs:
SHARP LC-19LE510RU (Panel LC185EXN (SD)(A1)), SHARP LC-22LE510RU (Panel 22 "), SHARP LC-32LE510RU (Panel LC320EUN SD V1), SHARP LC-32SH130E (Panel LC320WXN / 720p HD), SHARP LC-32SH340 LC-32SH340E (Panel LC320WUN (SC)(B1) ), TOSHIBA 19EL833R (Panel V185B1-LE2 LED), TOSHIBA 26LD833F (Panel LC260EXN (SD)(A3)), TOSHIBA 32DL833R 32DL834R (Panel LC320EXN SD A2 led).
PSU Advanced
The 32DL833R model uses a 17PW07-2 power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, this is a boost converter based on the FAN7529 PWM controller, which eliminates the charge current of the electrolytic capacitor of the rectifier filter directly from the network through open diodes, when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the TOSHIBA 32DL833R device:
Installed matrix (LED-panel) LC320EXN SD A2 led.
The LED driver 6917L-0072A is used to power the backlight LEDs, it is controlled by the BD9262EFV PWM controller. As the power elements of the LED driver, DB30AX type keys are used.
The necessary supply voltages for all nodes of the TOSHIBA 32DL833R TV are generated by the 17PW07-2 power supply module or its analogs using FAN7621 (PWM resonant), FAN7529 (PFC), FSDL321 (Standby), NCP1579 (Step-Down) microcircuits and power switches of the FQPFN50C type AO4842.
MainBoard - the main board (motherboard) is a 17MB60-4 module, using RT8293AH (8), TPA3113D2, 4558CM, 9EBG 449 (6) chips and others.
The DTOS403LH122E tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC320EXN-SDA2
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 380 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (6-bit + Hi-FRC)
Response Time: 9 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
Brand: TOSHIBA, Model: 32DL833.
Briefly from the TV: LCD, LED backlight, built-in DVD player, 32 ", 1366x768, 720p HD, sound: 10W, HDMI: 2.
The composition includes MainBoard 17MB60-4 .1 75025776, DVD 75026264 and LCD panel (matrix) LC320EXN SD A2.
Power Supply Unit (PSU) 17PW07-2 Power Supply.
TOSHIBA 32DL833 LED TV with LC320EXN LCD, 32 "(81 cm) diagonal size in 16: 9 format. The required screen brightness of 400 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 1200: 1 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 of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic I processing and the formation of the digital signal is in 480i standards, 480p, 576i, 576p, 720p, 1080i, 1080p Supported multimedia file formats:. MP3, MPEG4, Xvid, DivX, MKV, VideoCD, SVCD, Picture CD, JPEG.
The power of the sound system 10 W (2x5 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, audio x2, component, SCART, 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.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C standards.
Overall dimensions: with stand 778x524x203 mm, without stand 778x485x64 mm.
Attention! The LC320EXN SD A2 panel of the TOSHIBA 32DL833 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.