Technical description and composition of the TOSHIBA 40LV933RB TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 40LV933RB
Chassis / Version: 32AV933
Panel: LTA400HM01 // LTA400HM22 // V400HJ2-L01
T-CON: GA_60HZ_FHD_V0.3
Inverter (backlight): SSI400_12A01 Rev0.3 // SSL400_0E1B
PWM Inverter: SSL110SN
MOSFET Inverter: MDD4N20Y
Trans Inverter: HS-482 U0 1268 C K
Power Supply (PSU): DPS-245FP // DPS-140SP-1
PWM Power: DDA010 (Standby), 1608B (PFC), S101 (6), DDA014 (18)
MOSFET Power: K10A60DR, K6A60DR
MainBoard: 32AV933 REV1.02 75029559
IC MainBoard: CPU: MSD3704PX-LF-VW; SPI Flash: 25Q64
Tuner: TDTK-G641D (U)
Control: CT-90326
Specifications 40LV933
TOSHIBA 40LV933RB
General recommendations for repairing TV LCD
TOSHIBA 40LV933RB TV, like any other, it is advisable to start repairing it by examining the internal and external visible physical visual changes. Visible damage to elements can sometimes suggest further directions for finding a defect before starting the necessary measurements. Electrolytic capacitors of filters with a swollen casing, as well as ring cracks formed in the soldered leads of heating elements, or a layer of coal on burnt resistors sometimes tell the repairman the causes of the malfunction and possible consequences.
In the case when the 40LV933RB does not turn on, does not respond to the remote control and the front panel buttons, does not blink bulbs and does not show any signs of operability, most likely in this case the DPS-245FP power supply module is faulty. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and, in the event of an open circuit, the reason should be sought in the power semiconductor elements of the pulsed flyback converter of the main PSU. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power switch of the converter, which can be installed separately on the radiator, or integrated with a PWM controller.
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 DDA010 (8), 1608B (8), S101 (6), DDA014 (18), which can only be checked 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 there is no image when you turn on the TOSHIBA 40LV933RB, or it appears for a second and disappears completely, but there is sound, most likely either the backlight lamps or their power converter (inverter) are faulty. 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.
All necessary precautions must be observed when disabling the inverter protection during diagnostics and not leaving it disconnected after the repair is completed.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software).
In cases where there is no tuning to the local television channels, you should make sure that there is a varicap supply voltage (30-33V) and other supply voltages at the terminals of the TDTK-G641D tuner.
Typical motherboard defect:
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. 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.
Firmware options are attached, taken from the site remont-aud-net.
Winbond's SPI FLASH chip must be replaced with a new one.
It should be remembered! Attempts to repair the TOSHIBA 40LV933RB TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-serviceability of the device!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 19-40/AV/LV/EL/HL/933 32AV933
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> DPS-140SP.
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 40LV933RB, Main: 32AV933
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 40LV933RB, Main: 32AV933, Panel: V400HJ2-L01
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 DPS-245FP 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 node is a Step-Up Converter based on a 1608B PWM controller that 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.
The appearance of the power supply
Key Features of the TOSHIBA 40LV933RB:
Installed matrix (LCD panel) LTA400HM01 or LTA400HM22 or V400HJ2-L01.
The matrix control uses the Timing Controller (T-CON) GA_60HZ_FHD_V0.3.
To power the backlight, an SSI400_12A01 inverter is used, it is controlled by the SSL110SN PWM controller. A transformer HS-482 U0 1268 C K is installed in the inverter converter. Keys of the MDD4N20Y type are used as power elements of the inverter.
The necessary supply voltages for all nodes of the TOSHIBA 40LV933RB TV are generated by the DPS-245FP power module or its analogs using DDA010 (Standby), 1608B (PFC), S101 (6), DDA014 (18) microcircuits and power switches of the K10A60DR, K6A60DR type.
MainBoard - the main board (motherboard) is a 32AV933 module using CPU chips: MSD3704PX-LF-VW; SPI Flash: 25Q64 and others.
The TDTK-G641D (U) tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA400HM01
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Active Area: 885.6x498.15 mm
Surface: Antiglare (Haze 4%)
Brightness: 450 cd / m²
Contrast Ratio: 4500: 1
Display Colors: 1.07B (8-bit + Hi-FRC), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 12 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 10-bit), 51 pins
Voltage: 12.0V