Technical description and composition of the TOSHIBA 26DV703 TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 26DV703 26DV703R
Chassis / Version: 09182-2
Panel: V260B3-L04 Rev. C1
Lamp backlight: 4 Lamp CCFL
Inverter (backlight): VIT70084.00 REV: 0 I260B3-4UF-L001A
PWM Inverter: OZ964GN
MOSFET Inverter: B44P04, B35N04
Trans Inverter: 80GL32P-5-N
Power Supply (PSU): FSP128-3F01A
PWM Power: SSC9502S, NCP1607 (PFC), STR-A6069H
MOSFET Power: FQPF5N50C, FQPF13N50C
MainBoard: 09182-2 48.71Y01.021
IC MainBoard: TDA7491P, Z1046AI, APW7120
Tuner: TDTC-G429D
Control: 09417-1 48.71X04.011
Specifications 26DV703
TOSHIBA 26DV703
General recommendations for repairing TV LCD
Possible manifestations of defects
- The TOSHIBA 26DV703 does not turn on at all. There is no reaction to the remote control and control buttons from the front panel. Indicator lights do not light or flash.
Often in such cases, the FSP128-3F01A power module is faulty. It is necessary to measure its output voltages and, if they are absent, check the power switches (FQPF5N50C, FQPF13N50C) and rectifier diodes for the probability of short circuit in the converters.
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 SSC9502S, NCP1607 (PFC), STR-A6069H, 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, there is sound, it responds to the remote. Or the image may appear for a second when turned on and immediately disappears.
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the 09182-2 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - TDA7491P, Z1046AI, APW7120 and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltages on the terminals of the TDTC-G429D tuner. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Attention! For users and owners of 26DV703 TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> TOSHIBA 26DV703 Chassis 09182-2 15DV703R, 19DV703R, 19DV704R, 22DV703R, 22DV704R, 26DV703R, 32DV703R
The appearance of MainBoard 09182-2 is shown in the figure below:09182-2
The appearance of the power supply
Main features of the TOSHIBA 26DV703 device:
Installed matrix (LCD panel) V260B3-L04 Rev. C1.
The VIT70084.00 inverter is used to power the backlight lamps, it is controlled by the OZ964GN PWM controller. The transformer 80GL32P-5-N is installed in the inverter converter. As power elements of the inverter, keys of the type B44P04, B35N04 are used.
The necessary supply voltages for all nodes of the TOSHIBA 26DV703 TV are generated by the FSP128-3F01A power supply module or its analogs using SSC9502S, NCP1607 (PFC), STR-A6069H microchips and power switches of the FQPF5N50C, FQPF13N50C type.
MainBoard - the main board (motherboard) is a 09182-2 module, using TDA7491P, Z1046AI, APW7120 and others.
The TDTC-G429D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: V260B3-L04
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: MVA, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 8.5 (G to G)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Embedded (Balance board)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
TOSHIBA 26DV703 LCD TV with V260B3-L04 LCD, 26 "(66 cm) diagonal size in 16: 9 format. 450 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Maximum brightness to minimum ratio (contrast) ) is 3000: 1. Dynamic contrast ratio of 30000: 1 is achieved by special control of the backlight. 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 an analog system . PAL, SECAM, NTSC Image processing and the formation of the digital signal is in 480i standards, 480p, 576i, 576p, 720p, 1080i Supported multimedia file formats:. MP3, VideoCD, SVCD, 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, 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, 1360x768.
The power consumed by the TV in the operating mode from the network is 75 watts.
Overall dimensions: 666x490x260 mm.
TV Weight: 8.8 kg.
Attention! The TOSHIBA 26DV703 LCD TV panel V260B3-L04 Rev. C1 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!