Technical description and composition of the TOSHIBA 32EL934RB TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 32EL934RB
Panel: LC320EXN SE A1
T-CON: LC320EXN-SE1A-K31 6870C-0414A
LED driver (backlight): PPW-LE32GX-O (A) 6917L-0097A
PWM LED driver: BD9395EFV
MOSFET LED driver: FDD850N10L
Power Supply (PSU): PE-3850-01UN-LF
PWM Power: A6069H, NCP1608, FSFR1800
Mainboard: 32AV933
IC MainBoard: CPU: MSD3704PX-LF-VW; SPI Flash: 25Q64
Tuner: TDTK-G641D (U)
Specifications 32EL934
TOSHIBA 32EL934RB
General repair guidelines for TV LCD LED
Repair of the TOSHIBA 32EL934RB TV should begin with a careful external examination of all its components and modules. Based on visible external changes in the state of the components, it is usually possible to determine the further direction of troubleshooting and localization of the defect before making the necessary measurements. 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 32EL934RB does not turn on and does not signal anything with the control lights on the panel, there is a possibility of a malfunction of the TV power module. With the same manifestations, the power regulator of the control processor on the motherboard may be faulty. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (IIP) it does not fail by itself without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, a PWM controller, which can only be checked replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
Sometimes the TOSHIBA 32EL934RB TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the LC320EXN (SE) panel backlight LEDs converter (A1), or a break in the LED circuit is possible. In such cases, first of all, it is necessary to verify the serviceability of all the electrolytic capacitors of the filter by supplying the LED driver itself, including in the power supply unit (power supply unit).
Often there is a need for disassembling the panel to check the health of the LEDs, as well as contact connections in the connectors and soldering.
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
Repair or diagnostics of the 32AV933 REV: 1.02 motherboard should begin by checking the stabilizers or power converters of its microcircuits. If necessary, you should update the software (software).
In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its Cpu chips: MSD3704PX-LF-VW, Spi Flash: W25Q64FV and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
Type 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. 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. SPI FLASH replacement required.
The firmware for the LC320EXN (SE) (A1) panel was taken from remont-aud-net. Winbond SPI FLASH 25Q64 must be replaced with a new one.
If the TV works normally from external devices, but does not tune into television channels, the TDTK-G641D (U) tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals, as well as the power supply of varicaps (30-33V).
Attention! For users and owners of 32EL934RB TVs who do not have the appropriate qualifications, knowledge and experience, we strongly recommend against attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 32EL934RB, Main: 32AV933 REV:1.02, Panel: LC320EXN(SE)(A1)
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> PE-3850-01UN-LF Power supply
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> 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)).
The appearance of the power supply
Main features of the TOSHIBA 32EL934RB device:
Installed matrix (LED-panel) LC320EXN SE A1.
The matrix control uses the Timing Controller (T-CON) LC320EXN-SE1A-K31.
The LED driver PPW-LE32GX-O is used to power the backlight LEDs, it is controlled by the BD9395EFV PWM controller. As the power elements of the LED driver, keys of the FDD850N10L type are used.
The necessary supply voltages for all nodes of the TOSHIBA 32EL934RB TV are generated by the PE-3850-01UN-LF power module or its analogs using A6069H, NCP1608, FSFR1800 microcircuits.
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: LG Display
Model: LC320EXN-SEA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: IPS, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 350 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
TOSHIBA 32EL934 LED TV with LC320EXN LCD, 32 "(81 cm) diagonal size in 16: 9 format. The required screen brightness of 320 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 1,000,000: 1 is achieved by special control of the LEDs. V This model uses side illumination from Edge LEDs. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard for 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, DivX, 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, 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 68 watts.
Overall dimensions: with stand 746x507x205 mm, without stand 746x467x64 mm.
TV mass: with stand: 9 kg, without stand: 8.5 kg.
Attention! The LC320EXN SE A1 panel of the TOSHIBA 32EL934 LED TV is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.