Technical description and composition of the TOSHIBA 32AV933RB TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 32AV933RB 32AV934RB
Panel: LC320WXN-SCC1 // LTA320AP05 75032576
T-CON: 6870C-0325A TPS65163, 404KP, TL2417MC
Inverter (backlight): 6632L-0626A LC320WXN
PWM Inverter: OZ9966SN (24)
MOSFET Inverter: FDD8447L (3)
Trans Inverter: xxA 12323H-BJ
Power Supply (PSU): DPS-140SP
PWM Power: DDA010 (Standby), S101 (6pin), 1608B (PFC), SSC9502 (PWM resonant = DDA014)
MOSFET Power: K10A60DR, K6A60DR
MainBoard: 32AV933 rev 1.02 75031643 (= 75030330)
IC MainBoard: MSD3704PX-LF-VW, TAS5707, 4435GH, TPA6132A2RTER_4VIA AIVI TI 221 AJ6Q, MX25L6406EM2I-12G
Tuner: TDTK-G641D
Control: CT-90326 N0TB120401037833
Specifications 32AV933
TOSHIBA 32AV933RB
General recommendations for repairing TV LCD
Repair of the TOSHIBA 32AV933RB, 32AV934RB must begin with the diagnosis of the malfunction and a thorough inspection of its external and internal components, including the case ones. In some cases, visible external damage to the elements can suggest directions for troubleshooting and localizing the defect before starting the necessary measurements at the control points of the nodes of electronic circuits. 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.
If the TOSHIBA 32AV933RB, 32AV934RB does not turn on, no control lights on the front panel will light or blink, therefore, there is a very high probability of a DPS-140SP power supply module malfunctioning. The diagnostics of the power supply should always be started by checking the fuse and, if it is broken, the first thing to do is to check the rectifier bridge diodes and the K6A60DR power switch for the possibility of an avalanche or thermal breakdown.
It should be remembered that the N-FET keys used in flyback converters rarely fail for no reason that must be sought by checking other elements of the circuit. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM controller microcircuit DDA010 (8), P1216 can also cause a breakdown of the power switch of the converter.
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.
In cases where the TOSHIBA 32AV933RB, 32AV934RB TV has lost its image, and the sound is there and all other functions are operational, there is a possibility of an inverter (converter for powering the backlight) malfunction. 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 6632L-0626A LC320WXN 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 open circuits in the lamp power supply circuit, as well as their possible leakage. 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 in view of 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.
Motherboard 75031643 (= 75030330) 32AV933 rev 1.02 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. In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - MSD3704PX-LF-VW, TAS5707, 4435GH, TPA6132A2RTER_4VIA AIVI TI 221 AJ6Q, MX25L6406EM2I-12G with new or obviously working ones.
Before replacing the TDTK-G641D tuner, if there is no tuning for the channels, you must first check the tuner supply voltage at the corresponding terminal.
Typical defect of the chassis 32AV933:
The TV does not enter the operating mode, the red indicator on the panel lights up, DO NOT POWER OFF SCAN appears and the scan scale is turned upside down. Scanning runs from 0 to 100% and starts again from 0%. After 100%, everything is repeated in a circle again.
Replacing software from the official site via USB does not help. Replacement required SPI FLASH 25Q64.
The firmware for the LC320EXN (SE) (A1) panel was taken from remont-aud-net. Winbond SPI FLASH must be replaced with a new one.
Attention to users! Independent repair of the TOSHIBA 32AV933RB, 32AV934RB TV without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 32AV933
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> DPS-140SP
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 32AV933RB, Main: 32AV933, Panel: LTA320AP05
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 32AV933RB, 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)).
PSU Advanced
The 32AV933RB model uses a DPS-140SP power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, this is a boost converter based on the 1608B PWM controller, which eliminates the charge current of the rectifier filter's electrolytic capacitor from the network directly through the 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 32AV933RB device:
Installed matrix (LCD panel) LC320WXN-SCC1 or LTA320AP05 75032576.
The matrix control uses the Timing Controller (T-CON) 6870C-0325A.
An inverter 6632L-0626A is used to power the backlight, controlled by the OZ9966SN PWM controller (24). An xxA 12323H-BJ transformer is installed in the inverter converter. As power elements of the inverter, keys of the FDD8447L type (3) are used.
The necessary supply voltages for all nodes of the TOSHIBA 32AV933RB TV are generated by the DPS-140SP power module or its analogs using DDA010 (Standby), S101 (6pin), 1608B (PFC), SSC9502 (PWM resonant = DDA014) microcircuits and K10A60DR power switches K6A60DR.
MainBoard - the main board (motherboard) is a 32AV933 module, using microchips MSD3704PX-LF-VW, TAS5707, 4435GH, TPA6132A2RTER_4VIA AIVI TI 221 AJ6Q, MX25L6406EM2I-12G and others.
The TDTK-G641D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC320WXN-SCC1
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: EEFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
TOSHIBA 32AV933 LCD TV with LC320WXN-SCC1 LCD, 32 "(81 cm) diagonal size in 16: 9 format. 400 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Dynamic contrast ratio of 25000: 1 is achieved by special 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 It is in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, MPEG4, Xvid, MKV, JPEG.
The power of the sound system 10 W (2x5 W) provide 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, 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 the DVB-T MPEG4, DVB-C standards.
The power consumed by the TV in the operating mode from the network is 56 watts.
Overall dimensions: with stand 785x528x213 mm, without stand 785x488x84 mm.
TV Weight: with stand: 9.5 kg, without stand: 8.5 kg.
Attention! The TOSHIBA 32AV933 LCD TV panel LC320WXN-SCC1 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!