Technical description and composition of the TOSHIBA 32LV933RB TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 32LV933RB
Chassis / Version: AV933
Panel: T315HW04 V.4 (REV.6)
T-CON: T315HW04 V0 CTRL BD 31T09-C0G
Inverter (backlight): V225-A04 DARFON
Power Supply (PSU): 75030266 0433-006T000
MainBoard: 32AV933 75030265 9C-EB40M00X0
IC MainBoard: CPU: MSD3704PX-LF-VW; SPI Flash: 25Q64
Tuner: TDK-G641D (U)
Control: Remote: CT-90326, IR: 32AV933_IR BD 60EB40R05B01P
Specifications 32LV933
TOSHIBA 32LV933RB
General recommendations for repairing TV LCD
It is advisable to start the diagnosis of a malfunction of the TOSHIBA 32LV933RB TV, like all others, with an external examination of possible changes, both external and internal elements. It often happens that some damage to elements or connections will help determine the correct direction of troubleshooting and localization of the defect. In most cases, the repairman can guess the causes of the defect and possible consequences by the characteristic signs of typical TV defects, for example, ring cracks formed in the soldering of element leads, swollen rectifier filter capacitors, charred resistors and other circuit elements.
In the absence of any signs of operability, when the TOSHIBA 32LV933RB does not turn on and does not signal anything with the control lights on the panel, the power supply module 75030266 0433-006T000 is most likely faulty. If the mains fuse is broken in the power supply, in most cases a breakdown of the power switch is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
Power switches in flyback converters fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The cause may be a malfunction of the PWM controller chip, which can only be checked by replacing it with a new or obviously working one.
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.
If the TOSHIBA 32LV933RB 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.
In most cases, the diagnosis and repair of the V225-A04 DARFON inverter is difficult due to the organization of protection, which turns it off in emergency cases to avoid fires during short circuits or open circuits in high voltage circuits and during depressurization of lamps. Often, repairmen block the protection circuits in order to make the necessary measurements at the inverter control points to identify the causes of the defect.
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.
The motherboard 75030265 9C-EB40M00X0 32AV933 must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up constantly. In such cases, if the power supply circuits of the microcircuits are working, a software update may be necessary.
Typical motherboard defect:
The TV does not enter the operating mode, the red indicator on the panel lights up, the message DO NOT POWER OFF SCAN appears and the scan scale is turned upside down. It goes from 0 to 100% and scans from 0% for a new one. After 100%, everything is repeated in a circle again.
Replacing software from the official site via USB does not help. Replacement and flashing 25Q64 required.
A firmware option with the LC320WXN panel is included, taken from the remont-aud-net site.
Winbond's SPI FLASH chip must be replaced with a new one.
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.
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 19-40/AV/LV/EL/HL/933 32AV933
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 32LV933RB, Main: 32AV933, Panel: LC320WXN
Service Manuals with Schematic Diagrams 53 pages 2011 on the model -----------> 19EL933RB, 19EL934RB, 23EL933RK, 23EL934RK, 26EL933B, 26EL933G, 26EL933RB, 26EL934G, 32EL933B, 32EL933G, 32EL933N, 32EL933RB, 32EL934G, 32EL934RB, 32HL933B, 32HL933G, 32HL933N, 32HL933RK, 40HL933B, 40HL933G, 40HL933N, 40HL933RK, 32AV933G, 32AV933N, 32AV933RB, 32AV934G, 32AV934RB, 32LV933G, 32LV933N, 32LV933RB, 40LV933G, 40LV933N, 40LV933RB
The appearance of the MainBoard 32AV933 is shown in the figure below:32AV933
32AV933 can be used in TVs:
TOSHIBA 19EL934RB 19EL933RB (Panel LC185EXE-TEA1), TOSHIBA 23EL934RK 23EL933RK (Panel LTM230HT10), TOSHIBA 26EL933RB (Panel LC260EXN-SDA3 75023140), TOSHIBA 32AV933RB 32AV934RB (Panel LC320WXN-SCC1 ), TOSHIBA 32EL933RB (Panel LC320EXN SE A1 75030579 LCD PANEL LC320EXN-SEA1), TOSHIBA 32EL934RB (Panel LC320EXN SE A1), TOSHIBA 32HL933RK (Panel LTA320HN03 T03), TOSHIBA 32LV933RB (Panel T315HW04 V.4 (REV.6)), TOSHIBA 40HL933RK (Panel LTA400HM22 T01), TOSHIBA 40LV933RB (Panel LTA400HM01 ), TOSHIBA 32L2454RB 32L2453RB (Panel LC320EUJ (FF)(E2)).
Main features of the TOSHIBA 32LV933RB device:
Installed matrix (LCD-panel) T315HW04 V.4 (REV.6).
The matrix control uses the Timing Controller (T-CON) T315HW04.
To power the backlight used inverter V225-A04.
The formation of the necessary supply voltages for all nodes of the TOSHIBA 32LV933RB TV is carried out by the power supply module 75030266, or its analogues.
MainBoard - the main board (motherboard) is a 32AV933 module using CPU chips: MSD3704PX-LF-VW; SPI Flash: 25Q64 and others.
The TDK-G641D (U) tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T315HW04 V4
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA3, Normally Black, Transmissive
Active Area: 698.4x392.85 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
Brand: TOSHIBA, Model: 32LV933.
Short from TV: LCD, 32 ", 1920x1080, 1080p Full HD, sound: 10W, HDMI connectors: 2.
The official Toshiba website has firmware (software update) for the models 32LV933RB (1.25.02), 32LV933N (1.25.02), 32LV933G (1.25.02).
The composition includes MainBoard 32AV933 75030265 9C-EB40M00X0 and LCD panel (matrix) T315HW04 V.4 (REV.6).
Power Supply Unit (PSU) 75030266 0433-006T000 Power Supply.
TOSHIBA 32LV933 LCD TV with T315HW04 LCD, 32 "(81 cm) diagonal size in 16: 9 format. 380 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Dynamic contrast ratio of 80,000: 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 arabic processing and digital signal generation takes place in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, MPEG4, DivX, MKV, JPEG.
The power of the sound system 10 W (2x5 W) provide 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, 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, 1920x1080.
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 126 watts.
Overall dimensions: with stand 785x528x213 mm, without stand 785x488x84 mm.
TV mass: with stand: 9 kg, without stand: 8.2 kg.
Attention! The T315HW04 V.4 (REV.6) panel of the TOSHIBA 32LV933 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!