Technical description and composition of the TOSHIBA 32DV733R TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 32DV733R
Panel: T315XW04 V.1
Inverter (backlight): E206453 V225-AXX
Power Supply (PSU): FSP-128-3F01
PWM Power: NCP1606 (PFC), SSC9502S, A6069 (Standby)
MainBoard: GEU2_MB 09183-2 48.72K01.021
IC MainBoard: SPI Flash: 25Q64BV
Tuner: TDAG4-D11A
Specifications 32DV733R
TOSHIBA 32DV733R
General recommendations for repairing TV LCD
Repair of the TOSHIBA 32DV733R must begin with the diagnosis of the malfunction and a thorough inspection of its external and internal components, including the case ones. Sometimes, only by some signs can we determine the further direction of the localization of the fault. 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 absence of any signs of operability, when the TOSHIBA 32DV733R does not turn on and does not signal anything with the control lights on the panel, the power supply module FSP-128-3F01 is most likely faulty. When diagnosing and repairing the power supply, first of all, it is necessary to check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module - rectifier diodes or power key.
In most cases, a breakdown of the N-Fet converter key does not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM NCP1606 pfc SSC9502S bp A6069 dezh from the manufacturer.
If an active Power Factor Corrector (PFC) is used in the power module circuitry, it is sometimes more difficult to troubleshoot. Knowledge, experience, intuition and skills in such cases have a great advantage for a successful repair.
In cases where the TOSHIBA 32DV733R TV has lost an image, and the sound is there and all the other functions are functional, there is a possibility of a malfunction of the inverter (converter for powering the backlight). When you turn on the TV, the image may appear briefly and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power.
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.
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.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
The appearance of the MainBoard GEU2_MB is shown in the figure below:GEU2_MB
PSU Advanced
The FSP-128-3F01 power supply module is made using the Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC is a Step-Up Converter based on the NCP1606 PWM controller, which evenly distributes high-frequency impulses of the charging current of the electrolytic capacitor of the rectifier filter of the mains voltage over a period of 50 Hz. The current of its charge in this case will already be determined not by its reactance (usually 10-30 ohms for the network frequency), but by the elements of the converter. As a result, a change in the amplitude of the pulses (envelope) of the consumed current of the converter will repeat the shape and phase of the input sinusoidal voltage. The availability of an increased voltage (about + 380V) in the operating mode on the capacitor of the line filter indicates the serviceability of the PFC node.
Main features of the TOSHIBA 32DV733R device:
Installed matrix (LCD panel) T315XW04 V.1.
To power the backlight used inverter E206453.
The necessary supply voltages for all nodes of the TOSHIBA 32DV733R TV are generated by the FSP-128-3F01 power module, or its analogs using NCP1606 (PFC), SSC9502S, A6069 (Standby) microcircuits.
MainBoard - the main board (motherboard) is a GEU2_MB module, using SPI Flash chips: 25Q64BV and others.
The TDAG4-D11A tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T315XW04 V1
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: MVA, Normally Black, Transmissive
Active Area: 697.68x392.26 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: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
TOSHIBA 32DV733R LCD TV with T315XW04 LCD, 32 "(81 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 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, MPEG4, VideoCD, SVCD, 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, 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.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C standards.
Attention! The T315XW04 V.1 panel of the TOSHIBA 32DV733R 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!
