Technical description and composition of the TOSHIBA 26DL834R TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 26DL834R
Chassis / Version: 17MB60
Panel: LC260EXN (SD) (A3)
LED driver (backlight): integrated into T-CON
Trans LED driver: 30067936 SMP-C2776
Power Supply (PSU): 17PW06-2 75025751 POWER MODULE, 26DL833B, 20553706
PWM Power: G1115LOP, 6742HR (8), 1579 (8)
MOSFET Power: MDS5652 (8),
MainBoard: 17MB60-3.1 75026356 PC BOARD ASSY, MAIN, 26DL834R, 20568365
IC MainBoard: 75026264 DVD MODULE, 19DL833B, 30071444
Tuner: TDOS403LH122E
Control: CT-8023
Specifications 26DL834
TOSHIBA 26DL834R
General repair guidelines for TV LCD LED
Repair of all electronic devices, including the TOSHIBA 26DL834R TV, it is advisable to start with an external examination of its external and internal elements. In some cases, visible external damage to the elements can suggest the direction of troubleshooting and localization of the defect even before the start of the necessary measurements at the control points of the nodes of electronic circuits. Electrolytic capacitors of filters with a swollen casing, as well as ring cracks formed in the soldered leads of heating elements, or a layer of coal on burnt resistors sometimes tell the repairman the causes of the malfunction and possible consequences.
In the case when the 26DL834R does not turn on, does not respond to the remote control and the front panel buttons, does not blink bulbs and does not show any signs of operability, the power supply module 17PW06-2 75025751 POWER MODULE, 26DL833B, 20553706 is probably faulty in this case such manifestations, it is necessary to check the stabilizer (converter) of the processor power supply on the motherboard. When diagnosing and repairing the power supply, first of all, replace the swollen filter capacitors of the secondary rectifiers and check the fuse and, if it is tattered, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and transistors MDS5652 (8), in the primary circuit.
In most cases, key breakdowns in switching power supplies (SMPS) do not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM G1115L0P, 6742HR (8), 1579 (8) from the manufacturer.
If the TOSHIBA 26DL834R has no image, there is sound and the channels are switched, there is a possibility of a malfunction in the backlight LED circuit of the 75025757 LCD PANEL, LC260EXN-SDA3, 30070448 panel, or their power converter - LED driver. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the LED driver itself, including in the secondary rectifier of the main PSU.
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.
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.
Repair of the motherboard 17MB60-3.1 75026356 PC BOARD ASSY, MAIN, 26DL834R, 20568365 tun TDOS403LH122E must begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
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 chips 75026264 DVD MODULE, 19DL833B, 30071444 and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Main VESTEL 17MB60
The appearance of the MainBoard 17MB60-3.1 is shown in the figure below:The 17MB60-3.1 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.
17MB60-3.1 can be used in TVs:
TOSHIBA 19DL834R (Panel V185B1-LE2 30070337), TOSHIBA 22DL833R 22DL834R (Panel LC216EXN (SD)(A1)), TOSHIBA 22EL833R (Panel LC216EXN-SDA1 / LC216EXN-SCA1), TOSHIBA 26DL834R (Panel LC260EXN (SD)(A3)), TOSHIBA 19DL833R (Panel V185B1-LE2 REV. C1).
The appearance of the power supply
Key Features of the TOSHIBA 26DL834R:
Installed matrix (LED-panel) LC260EXN (SD) (A3).
An integrated LED driver is used to power the backlight LEDs. The transformer 30067936 SMP-C2776 is installed in the converter of the LED driver.
The necessary supply voltages for all nodes of the TOSHIBA 26DL834R TV are generated by the 17PW06-2 power supply module or its analogs using G1115LOP, 6742HR (8), 1579 (8) microchips and MDS5652 (8) type power switches.
MainBoard - the main board (motherboard) is a 17MB60-3.1 module, with the use of chips 75026264 DVD MODULE, 19DL833B, 30071444 and others.
The TDOS403LH122E 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
Brand: TOSHIBA, Model: 26DL834.
Briefly from the TV: LCD, LED backlight, built-in DVD player, 26 ", 1366x768, 720p HD, sound: 10W, HDMI: 2.
The composition uses MainBoard 17MB60-3.1 75026356 and an LCD panel (matrix) LC260EXN (SD) (A3).
Power Supply Unit (PSU) 17PW06-2 75025751 Power Supply.
TOSHIBA 26DL834 LED TV with LC260EXN LCD, 26 "(66 cm) diagonal size of 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 1000: 1 Dynamic contrast ratio of 3,000,000: 1 is achieved by special control of the LEDs. This model uses side LED backlighting 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). Audio 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, 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, 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.
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 33 watts.
Overall dimensions: with stand 648x452x180 mm, without stand 648x414x59 mm.
TV Weight: with stand: 8 kg, without stand: 6.4 kg.
Attention! The TOSHIBA 26DL834 LCD 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.