Technical description and composition of the TOSHIBA 26AV703R TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 26AV703R
Chassis / Version: MST3740EU-T MAIN BD UNIHAN
Panel: V260B3-L04 RevC1
Inverter (backlight): VIT7008.00 Rev0 75021400 INVERTER, I260B3-4UF
PWM Inverter: OZ964GN (20) AS339M-E1 (14)
MOSFET Inverter: B35N04 B44P04
Trans Inverter: T51.8223.210 T51.8224.210
Power Supply (PSU): FSP132-3F01 75018688 POWER MODULE, OPENFRAME 132W / + 5,12,24V, 0433-002F000
PWM Power: A6069H (8), SSC9512S (18), SSC9502 (18), 1607B (PFC)
MOSFET Power: FOPF5N50C FOPF8N60
MainBoard: MST3740EU-T Rev1.4 75018839 PC BOARD ASSY, MAIN, 26AV703G, 69EB3IM13C05P
IC MainBoard: MST9B884JL-LF, MX25L1605DM2I, W9412G6IH-4
Tuner: TT2124
Control: CT-90326
Specifications 26AV703
TOSHIBA 26AV703R
General recommendations for repairing TV LCD
Repair of the TOSHIBA 26AV703R must begin with the diagnosis of the malfunction and a thorough inspection of its external and internal components, including the case ones. 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 26AV703R 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 FSP132-3F01 75018688 POWER MODULE, OPENFRAME 132W / + 5.12, 24V, 0433-002F000. Diagnostics of the power supply should always be started by checking the fuse and, if it is broken, it is first necessary to check the rectifier bridge diodes and the power switch FOPF5N50C FOPF8N60 for the possibility of an avalanche or thermal breakdown.
It should be remembered that in the practice of repair, usually the power keys of N-Fet converters do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the A6069H (8) SSC9512S (18) SSC9502 (18) 1607B (8) PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If the power module uses an active KKM circuit (power factor control), troubleshooting is somewhat more complicated.
If the TOSHIBA 26AV703R has no image, but there is sound and the TV is controlled by the remote control, a malfunction in the display backlight nodes is likely. The lamps or the power converter - inverter may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the inverter, and check the LCD lamps by connecting external and obviously serviceable for diagnosis to the connectors.
Repair of the inverter VIT7008.00 Rev0 75021400 INVERTER, I260B3-4UF can often be somewhat complicated by the use of special protection circuits, which are designed to disconnect it in emergency cases for fire safety during depressurization of lamps, or short circuits or breaks in high-voltage circuits and connections. Sometimes it becomes necessary for diagnostic purposes to block the protection circuits in order to be able to make the necessary measurements at the control points of the circuit.
It should be remembered that when the protection is turned off, there is always a risk of failure of the power elements of the inverter during diagnosis. After repair, it is necessary to restore all standard converter protection circuits.
If the motherboard MST3740EU-T-Rev1.4 75018839 PC BOARD ASSY, MAIN, 26AV703G, 69EB3IM13C05P is faulty, first of all it is necessary to check all the linear power regulators of its chips and, if necessary, update the software. Sometimes you can check the health of MB only by replacement.
For owners of the 26AV703R TV, we recommend that you contact qualified professionals with experience to repair! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
1. Service Manual 51 pages on models 19AV703R, 22AV703R, 26AV703R, 32AV703R, 32LV703R, 37LV703R, 40LV703R, 19AV704R, 22AV704R, 26AV704R, 32AV704R, 32LV704R, 37LV704R, 40LV704R
2. Service Manuals with Schematic Diagrams 73 pages on models 19AV703, 22AV703, 26AV703, 32AV703, 19AV703R, 22AV703R, 26AV703R, 32AV703R, 19AV703G, 22AV703G, 26AV703G, 32AV703G
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba main 26AV703G
SCHEMATIC DIAGRAM / ------------------> TOSHIBA Power Supply FSP132-3F01
The appearance of the MainBoard MST3740EU-T is shown in the figure below:MST3740EU-T
MST3740EU-T can be used in TVs:
TOSHIBA 26AV703R (Panel V260B3-L04 RevC1), TOSHIBA 32AV703R C (Panel V315B5-L12 75018968), TOSHIBA 32AV703R K (Panel LTA320AP08 75016146 ), TOSHIBA 32AV704R (Panel V315B5-L12 Rev01 75018968), TOSHIBA 32LV703R A (Panel T315HW04 V.4 (12v) 75018019), TOSHIBA 32LV703R K (Panel LTA320HA04 T01 75016399 (12v)), TOSHIBA 40LV703R C (Panel V400H1-L10 REV C1 75018974), TOSHIBA 40LV703R K (Panel LTA400HM02 T03).
PSU Advanced
The 26AV703R model uses the FSP132-3F01 power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, it is a step-up converter based on the 1607B 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 26AV703R device:
Installed matrix (LCD panel) V260B3-L04 RevC1.
The VIT7008.00 inverter is used to power the backlight lamps; it is controlled by the OZ964GN (20) AS339M-E1 PWM controller (14). The transformer T51.8223.210 T51.8224.210 is installed in the inverter converter. As power elements of the inverter, keys of the type B35N04 B44P04 are used.
The necessary supply voltages for all nodes of the TOSHIBA 26AV703R TV are generated by the FSP132-3F01 power supply module or its analogs using A6069H (8), SSC9512S (18), SSC9502 (18), 1607B (PFC) microcircuits and power switches of the FOPF5N50C FOPF8N60 type.
MainBoard - the main board (motherboard) is a module MST3740EU-T, using microcircuits MST9B884JL-LF, MX25L1605DM2I, W9412G6IH-4 and others.
The TT2124 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 26AV703 LCD TV with V260B3-L04 LCD, 26 "(66 cm) diagonal size in 16: 9 format. The brightness of the screen is 450 cd / m² by CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (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, audio x3, 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.
The power consumed by the TV in the operating mode from the network is 80 watts.
Overall dimensions: with stand 667x494x240 mm, without stand 667x448x90 mm.
TV Weight: with stand: 10.5 kg, without stand: 9.4 kg.
Attention! The TOSHIBA 26AV703 LCD TV panel V260B3-L04 RevC1 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!