Toshiba
Model: 32AV732R
Panel: V315B5-L12
Inverter (backlight): T871029.26 (ETL-XPC-204T)
Power Supply (PSU): FSP132-3F01
PWM Power: A6069H (7), SSC9512S (18), SSC9502 (18), 1607B (PFC)
MOSFET Power: FQPF5N50 8N60
MainBoard: TSB-DTV-WXGA Rev 1.04
IC MainBoard: CPU: ZR39675HGCG; SOUND: TAS5707
Tuner: TDAG4-D01A
Control: 75014827 REMOCON HAND UNIT, CT-90326
Specifications 32AV732
TOSHIBA 32AV732R
General recommendations for repairing TV LCD
Like any other TV, TOSHIBA 32AV732R repair it is advisable to start with an external examination of the visible changes in the external and internal elements. Visible damage to elements can sometimes suggest further directions for finding a defect before starting the necessary measurements. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
In the case when the 32AV732R does not turn on, does not respond to the remote control and the front panel buttons, does not blink light bulbs and does not show any signs of operability, most likely in this case the FSP132-3F01 power module is faulty. When diagnosing and repairing the FSP132-3F01 power supply unit, it is first necessary to check the fuse, and if it breaks, the power switch FQPF5N50 8N60 and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
If a breakdown of the power switch of the flyback converter of the power supply unit is detected, it should be remembered that it does not fail without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, PWM controller A6069H (7) SSC9502S (18) 607B (8 ), which can be checked only by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
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.
If the TOSHIBA 32AV732R does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction of the display backlight, or their power converter - inverter. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the inverter itself, including in the secondary rectifier of the main PSU.
Diagnostics of the 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.
In these cases, special care must be taken due to the risk of failure of the power elements. After completing all repair work, it is imperative to restore the protection circuits for full and safe further operation of the TV by the user.
If the motherboard TSB-DTV-WXGA Rev 1.04 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.
Remember! Attempts by users to repair the TOSHIBA 32AV732R TV without proper qualifications and the necessary experience can lead to serious negative consequences!
Repair MainBoard
The appearance of the MainBoard TSB-DTV-WXGA is shown in the figure below:
TSB-DTV-WXGA
PSU Advanced
The 32AV732R 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 32AV732R device:
Installed matrix (LCD panel) V315B5-L12.
To power the backlight used inverter T871029.26.
The formation of the necessary supply voltage for all nodes of the TOSHIBA 32AV732R TV
there is a power module FSP132-3F01, or its analogs using microchips A6069H (7), SSC9512S (18), SSC9502 (18), 1607B (PFC) and power switches of the type FQPF5N50 8N60.
MainBoard - the main board (motherboard) is a TSB-DTV-WXGA module, using CPU chips: ZR39675HGCG; SOUND: TAS5707 and others.
The TDAG4-D01A tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V315B5-L12
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8.5 (G to G)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
Brand: TOSHIBA, Model: 32AV732.
Shortly from the TV: LCD, 32 ", 1366x768, 720p HD, sound: 20W, HDMI connectors: 2.
The composition uses MainBoard TSB-DTV-WXGA Rev 1.04 and LCD panel (matrix) V315B5-L12.
Power Supply Unit (PSU) FSP132-3F01 Power Supply.
TOSHIBA 32AV732 LCD TV with V315B5-L12 LCD, 32 "(81 cm) diagonal size in 16: 9 format. 500 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Maximum brightness to minimum ratio (contrast) ) is 1200: 1. Dynamic contrast ratio of 18000: 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 of 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, 1080p Supported multimedia file formats:. MP3, JPEG.
The power of the sound system 20 W (2x10 W) provides 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, SCART, RGB, 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 the DVB-T MPEG4, DVB-C standards.
The power consumed by the TV in the operating mode from the network is 145 watts.
Overall dimensions: 798x564x233 mm.
Mass of the TV: 11.5 kg.
Attention! The V315B5-L12 panel of the TOSHIBA 32AV732 LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!