Technical description and composition of the TOSHIBA 32BV500B TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 32BV500B
Chassis / Version: 17MB45M-3 VESTEL
Panel: LTA320AP06
Inverter (backlight): SSI320_4UA01
PWM Inverter: OZ9966SN
MOSFET Inverter: STU432S, KMB054N40DB
Trans Inverter: LT-U3208
Power Supply (PSU): 17PW26-4
PWM Power: FAN7529 (PFC), FAN7711 (8), CAT7581 (8)
MOSFET Power: MTP6N60E, SSP7N60A
MainBoard: 17MB45M-3
IC MainBoard: CPU: MST9WB6JS-LS; SPI Flash: MX25L1605; EEPROM: MX25L1605;
Tuner: TDTC-G101D
Control: RC-3910
Specifications 32BV500
TOSHIBA 32BV500B
General recommendations for repairing TV LCD
Repair of the TOSHIBA 32BV500B must begin with the diagnosis of the malfunction and a thorough inspection of its external and internal components, including the case ones. It often happens that some damage to elements or connections will help determine the correct direction in troubleshooting and localizing a defect. 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.
Sometimes the TOSHIBA 32BV500B TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the 17PW26-4 common power module. 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. Possible options.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors of the N-FET type fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, either dried electrolytic capacitors or dangling resistors of the primary circuit of the PSU, involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM controller chip DL321, FAN7711, MDF9N50, which it is desirable to check by replacement, are subject to verification.
If the power module uses an active KKM circuit (power factor control), troubleshooting is somewhat more complicated.
If there is no image when you turn on the TOSHIBA 32BV500B, or it appears for a second and disappears completely, but there is sound, most likely either the backlight or the power converter (inverter) are malfunctioning. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit.
The operation of the power circuits of the inverter and the backlight in the normal mode are controlled by special protection, which is organized for fire safety, for example, to disconnect during short circuits or breaks in high-voltage connections or when the lamps are depressurized. This protection makes it difficult to diagnose and repair the inverter.
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.
Repair of the 17MB45M-3 motherboard 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.
If the TV works normally from external devices, but does not tune into television channels, the TDTC-G101D tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals, as well as the power supply of varicaps (30-33V).
Attention to users! Self-repair of a TOSHIBA 32BV500B TV without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Vestel Chassis 17MB45-2
The appearance of the MainBoard 17MB45M-3 is shown in the figure below:17MB45M-3
PSU Advanced
The 32BV500B model uses a 17PW26-4 power supply unit using the PFC (Power Factor Correction) node - an active filter of higher harmonics of the current consumption. In fact, this is a boost converter based on the FAN7529 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.
Main features of the TOSHIBA 32BV500B device:
Installed matrix (LCD panel) LTA320AP06.
To power the backlight, an SSI320_4UA01 inverter is used, controlled by the OZ9966SN PWM controller. A transformer LT-U3208 is installed in the inverter converter. As power elements of the inverter, keys of the STU432S, KMB054N40DB type are used.
The necessary supply voltages for all nodes of the TOSHIBA 32BV500B TV are generated by the 17PW26-4 power module or its analogs using FAN7529 (PFC), FAN7711 (8), CAT7581 (8) microcircuits and power switches of the MTP6N60E, SSP7N60A type.
MainBoard - the main board (motherboard) is a 17MB45M-3 module using CPU chips: MST9WB6JS-LS; SPI Flash: MX25L1605; EEPROM: MX25L1605; and others.
The TDTC-G101D tuner provides television reception and channel tuning.
Information from an alternative source:
TOSHIBA 32BV500B
Panel Type (Matrix): LTA320AP06
Motherboard: 17MB45M-3, Tuner: TDTC-G101D, INVERTER: SSI320_4UA01, OZ9966SN,
PSU: 17PW26-4, DL321, FAN7711, MDF9N50 x3
Remote control: RC-3910, PSU schematic
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320AP06
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: APVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Contrast Ratio: 4000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
TOSHIBA 32BV500 LCD TV with LTA320AP06 32 ”(81 cm) diagonal LCD display in 16: 9 format. 450 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. HD images can be viewed in high resolution 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p Supported media file formats: MP3, JP EG.
The power of the sound system 12 W (2x6 W) provides 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, 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, 1280x1024, 1360x768.
A digital tuner is capable of receiving television channels in DVB-T standards.
The power consumed by the TV in the operating mode from the network is 150 watts.
Overall dimensions: with stand 787x556x187 mm, without stand 787x514x94 mm.
TV Weight: with stand: 12.3 kg, without stand: 11.6 kg.
Attention! The TOSHIBA 32BV500 LCD TV panel LTA320AP06 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!