Technical description and composition of the TOSHIBA 40BV700B TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 40BV700B
Chassis / Version: 17MB35-4 V1 Bush LCD46F1080P
Panel: LTA400HA07
T-CON: SYNC60C4LVO.3 THF9301, W9864G2GH-6
Inverter (backlight): SSI_400_14A01 REVO.1
Power Supply (PSU): 17PW26-4 V.1
PWM Power: FAN7529 (PFC), FAN7711 (8), CAT7581 (8)
MOSFET Power: MTP6N60E / SSP7N60A, MTP6N60E / SSP7N60A, NTGS3446
MainBoard: 17MB35-4 V1
IC MainBoard: THF9301, W9864G2GH-6
Tuner: TDTC-G101D
Control: RC-3910
Specifications 40BV700
TOSHIBA 40BV700B
General recommendations for repairing TV LCD
It is advisable to start any repair and diagnostics of the TOSHIBA 40BV700B TV with a careful external examination of the internal and external elements, including case parts, display, buttons and cables. Visible damage to elements can sometimes suggest further directions for finding a defect before starting the necessary measurements. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
In the case when the 40BV700B does not turn on, does not respond to the remote control and buttons on the front panel, does not blink light bulbs and does not show any signs of operability, most likely in this case the power supply module 17PW26-4 V.1 is faulty. In this case, first of all, it is necessary to check the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the N-FET converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Options are MTP6N60E / SSP7N60A, MTP6N60E / SSP7N60A, NTGS3446.
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 PWM controller chip FAN7529 (8), FAN7711 (8), CAT7581 (8) DC-DC may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
When using a power factor correction unit (PFC) in the power modules, troubleshooting becomes somewhat more complicated and requires additional experience and knowledge of their operation.
Sometimes the TOSHIBA 40BV700B 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 backlight converter, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all electrolytic capacitors of the filter according to the power supply of the inverter itself, including in the power supply unit (power supply unit).
Repairing the SSI_400_14A01 REVO.1 inverter is difficult because in case of any malfunction or abnormal situation, even if the lamps are unevenly worn, protection is triggered, which turns it off for fire safety purposes. Diagnostics become impossible and protection needs to be disabled.
When disabling protection for diagnostic purposes, it must be remembered that in this case there is a risk of failure of the power elements of the inverter. Upon completion of the diagnosis, all regular protection circuits should be restored.
In cases of attempts to repair the motherboard 17MB35-4 V1, it is necessary to check the operability of the power stabilizers of the microcircuits and, if possible, update the software (software). In some cases, it is necessary to check or replace (if necessary) the elements of the MB board (SSB) - THF9301, W9864G2GH-6.
The TDTC-G101D tuner malfunction is established after checking the software and all the supply voltages at its terminals, including the varicap supply voltage (30-33V).
Attention to the owners! Attempts to self-repair the TOSHIBA 40BV700B TV are not recommended by the manufacturer and can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba Main 17MB35-4
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 40BV700B, Main: 17MB35-4 V1, Panel: LTA400HA07
The appearance of the MainBoard 17MB35-4 is shown in the figure below:17MB35-4
PSU Advanced
The 40BV700B TV is equipped with a 17PW26-4 power module using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the FAN7529 PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected directly to the network directly through open diodes, when the value of the charge current determines its reactance (about 15-30 ohms at a frequency of 50 Hz). As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
Key Features of the TOSHIBA 40BV700B:
Installed matrix (LCD-panel) LTA400HA07.
The matrix control uses the Timing Controller (T-CON) SYNC60C4LVO.3.
To power the backlight used inverter SSI_400_14A01.
The necessary supply voltages for all nodes of the TOSHIBA 40BV700B TV are generated by the 17PW26-4 power module or its analogs using FAN7529 (PFC), FAN7711 (8), CAT7581 (8) microchips and power switches of the MTP6N60E / SSP7N60A, MTP6N60E / SSP7N34A, NT type .
MainBoard - the main board (motherboard) is a 17MB35-4 module, using the THF9301, W9864G2GH-6 chips, and others.
The TDTC-G101D tuner provides television reception and channel tuning.
Information from an alternative source:
TOSHIBA 40BV700B Same chassis: Bush LCD46F1080P
Panel Type (Matrix): Samsung LTA400HA07,
Motherboard: Part No: 17MB35-4 V1, Tuner: TDTC-G101D,
T-con: Part No: SYNC60C4LVO.3, THF9301, W9864G2GH-6
Invertor: Part No: SSI_400_14A01 REVO.1
PSU: Part No: 17PW26-4 V.1
Remote control: RC-3910
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA400HA07
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 885.6x498.15 mm
Surface: Antiglare (Haze 7%)
Brightness: 430 cd / m²
Contrast Ratio: 4000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 14 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
TOSHIBA 40BV700 LCD TV with 40 ”(102 cm) diagonal LCD display, 16: 9 format. LCD brightness of 450 cd / m² is provided by CCFL (EEFL) fluorescent lamps. Dynamic contrast ratio of 40,000: 1 is achieved by special operation control The design and technical capabilities of the TV include viewing programs and movies in high quality HD with a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. The startup image 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, JPEG.
The power of the sound speaker system 16 W (2x8 W) is provided by 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 x2, component, SCART x2, RGB, VGA, HDMI x4, 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 digital tuner is capable of receiving television channels in DVB-T MPEG4 standards.
The power consumed by the TV in the operating mode from the network is 131 watts.
Overall dimensions: with stand 970x653x219 mm, without stand 970x613x99 mm.
TV Weight: 15 kg.
Attention! The TOSHIBA 40BV700 LCD TV panel LTA400HA07 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!