Technical description and composition of the TOSHIBA 26AV733R TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 26AV733R
Panel: V260B3-L04 Rev. C1
T-CON: no
Inverter (backlight): VIT70084.00 Rev: 0
PWM Inverter: OZ964GN (20)
MOSFET Inverter: B44P04 (3), B35N04 (3)
Trans Inverter: 80GL32P-5-N
Power Supply (PSU): 715G3714-P01-H20-003D
PWM Power: L6599D (PWM Resonant)
MOSFET Power: K4100
MainBoard: 715G3705 - M01-000-005B M-1
IC MainBoard: BD5445EFV SII9187ACNU
Tuner: ENV57S01D8RF
Control: CT-90326
Specifications 26AV733
TOSHIBA 26AV733R
General recommendations for repairing TV LCD
Like any other TV, TOSHIBA 26AV733R repair it is advisable to start with an external inspection of the visible changes in the external and internal elements. Often, by the external signs and nature of some damage, it is possible to draw preliminary conclusions and determine a further algorithm for troubleshooting. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
In the case when the 26AV733R 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, most likely in this case the power supply module 715G3714-P01-H20-003D is faulty. When diagnosing and repairing the power supply 715G3714-P01-H20-003D, the fuse must first be checked, and if it is broken, the power switch K4100 and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
As a rule, the keys of flyback converters, which use the N-Fet field effect transistor on a separate radiator, or integrated with the L6599D PWM controller (16) in a single chip, are reliable enough and rarely fail for no reason. The reasons for the breakdown of the key should be sought by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
When using the Active Power Factor Correction (CMC) circuitry in the power module, the search for faulty elements is somewhat more complicated.
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when you turn on, but there are sound and other functions work, there is a high probability of a malfunction of the inverter (power converter of the backlight). In such cases, the lamps, the inverter and the common power module are subject to verification, in which the electrolytic capacitors of the rectifier filter supplying the inverter should be checked.
Diagnostics of the VIT70084.00 Rev: 0 inverter can be difficult due to the operation of the protection, which is organized by the designers to prevent negative consequences or fires in emergency cases, for example, during short circuits or breaks in the lamp power supply circuit, as well as their possible depressurization. To make the necessary measurements at control points or to take the necessary waveforms, repairmen have to block the protection circuits in order to be able to diagnose.
When diagnosing with the protection off, special precautions must be taken, because there is a risk of failure of the power elements of the inverter. After the diagnosis, it is imperative to restore the protection circuits for the inverter to operate normally.
On the motherboard 715G3705-M01-000-005B M-1, in the event of a malfunction, you should first check the operation of all the power stabilizers of the microcircuits and, if necessary, update the software (software). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements BD5445EFV SII9187ACNU.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the varicap tuner ENV57S01D8RF, which is usually within 30-33V, as well as other supply voltages on the terminals of the tuner.
Owners and users of the TOSHIBA 26AV733R TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 26AV733R MainBoard 715G3705
Service Manuals with Schematic Diagrams 64 pages of 2010 on models 26AV733R, 26AV733F, 26AV733G, 32AV733F, (26AV734, 32AV734)
The appearance of the MainBoard 715G3705 is shown in the figure below:715G3705
Main features of the TOSHIBA 26AV733R device:
Installed matrix (LCD panel) V260B3-L04 Rev. C1.
The matrix control uses the Timing Controller (T-CON) no.
The VIT70084.00 inverter is used to power the backlight, controlled by the OZ964GN PWM controller (20). The transformer 80GL32P-5-N is installed in the inverter converter. As power elements of the inverter, keys of the type B44P04 (3), B35N04 (3) are used.
The necessary supply voltages for all nodes of the TOSHIBA 26AV733R TV are generated by the 715G3714-P01-H20-003D power module, or its analogs using L6599D (PWM Resonant) microcircuits and K4100 type power switches.
MainBoard - the main board (motherboard) is a 715G3705 module, using BD5445EFV SII9187ACNU chips and others.
The ENV57S01D8RF 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 26AV733 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, JPEG.
The power of the sound system 10 W (2x5 W) provide 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 x2, 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 90 watts.
Overall dimensions: with stand 666x474x265 mm, without stand 666x429x94 mm.
TV Weight: with stand: 9 kg, without stand: 7.7 kg.
Attention! The TOSHIBA 26AV733 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!