Technical description and composition of the TOSHIBA 19EL934RB TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 19EL934RB 19EL933RB
Chassis / Version: 32AV933
Panel: LC185EXE-TEA1
LED driver (backlight): integrated into PSU
PWM LED driver: OZ9998BDN (16)
Power Supply (PSU): DPS-30SP
PWM Power: DDA014, D101, DDA010 (= ICE2QR0665 Standby)
Mainboard: 32AV933
IC MainBoard: MSD3704PX-LF-VW, TAS5707L, 25Q64FVSIG, H5PS5162GFR
Tuner: TDTK-G641D (U)
Control: CT-90326
Specifications 19EL934
TOSHIBA 19EL934RB
General repair guidelines for TV LCD LED
Repair of the TOSHIBA 19EL934RB TV should begin with a fault diagnosis, which involves a careful examination of the external and internal elements of the device. Using visible changes in the state of components, it is usually possible to determine the further direction of troubleshooting and localization of the defect before the necessary measurements are taken. 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.
Sometimes the TOSHIBA 19EL934RB TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the DPS-30SP common power module. If it is working properly, you need to check the processor batteries on the SSB (Main Board). In the general case, first of all, it is necessary to check the electrolytic capacitors of the secondary rectifier filters and the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Possible options.
It should be remembered that in the practice of repair, usually the power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If, when you turn on the TV, the image appears and immediately disappears, or is absent initially when you turn on, but the sound is there and other functions work, there is a high probability of a malfunction of the LED driver (LC185EXE-TEA1 panel LED backlight power converter). In such cases, the general power module is also subject to verification, in which the electrolytic capacitors of the rectifier filter supplying the LED driver should be checked.
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required.
Repair of the 32AV933 motherboard must begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
When repairing an MB board, you need to check its components MST3704PX-LF-VW, TAS5707L. Defective items should be replaced. If BGA chips are installed, their malfunction is usually localized by heating. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
If you suspect that the TDTK-G641D (U) tuner is malfunctioning, first of all, you need to make sure that the voltage of the varicaps (30-33V) is on the corresponding output of the tuner, as well as the other voltage supplying it.
Typical 32AV933 motherboard defect:
The TV does not enter the operating mode, the red indicator on the panel lights, the message DO NOT POWER OFF SCAN and the scan scale appear upside down. Scanning from 0 to 100% takes place, then it starts again from 0% and everything is in a circle.
Replacing software from the official site via USB does not help. Replacement and flashing of SPI FLASH 25Q64 is required.
Firmware options included. Winbond's SPI FLASH chip must be replaced with a new one.
Attention! For users and owners of 19EL934RB TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba 19-40/AV/LV/EL/HL/933 32AV933
TOSHIBA Power Supply DPS-30SP 19EL934RB
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 26EL933RB, Main: 32AV933 Option 1
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 26EL933RB, Main: 32AV933 Option 2
FIRMWARE FOR SPI FLASH -----------> TOSHIBA 19EL933RB, Main: 32AV933 REV:1.02
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)).
The appearance of the power supply
Main features of the TOSHIBA 19EL934RB device:
Installed matrix (LED-panel) LC185EXE-TEA1.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the OZ9998BDN PWM controller (16).
The necessary supply voltages for all nodes of the TOSHIBA 19EL934RB TV are generated by the power supply module DPS-30SP, or its analogs using microchips DDA014, D101, DDA010 (= ICE2QR0665 Standby).
MainBoard - the main board (motherboard) is a 32AV933 module, using microchips MSD3704PX-LF-VW, TAS5707L, 25Q64FVSIG, H5PS5162GFR and others.
The TDTK-G641D (U) tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC185EXE-TEA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.1 / 3.9 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 strings WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
TOSHIBA 19EL934 LED TV with LC185EXE-TEA1 LCD display, 19 "(48 cm) diagonal size in 16: 9 format. The required screen brightness of 230 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 1,000,000: 1 is achieved by special control of the LEDs 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 acoustic system of sound 6 W (2x3 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.
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 30 watts.
Overall dimensions: with a support 450x320x140 mm, without a support 450x287x37 mm.
TV mass: with stand: 3 kg, without stand: 2.7 kg.
Attention! The panel of the LC185EXE-TEA1 TOSHIBA 19EL934 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.