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TOSHIBA 19EL934RB TV


Repair of the TOSHIBA 19EL934RB TV


Technical description and composition of the TV TOSHIBA 19EL934RB, panel type and modules used. 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

Technical characteristics 19EL934
TOSHIBA 19EL934RB

General recommendations for the repair of 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. From visible changes in the state of the components, it is usually possible to determine the further direction of the search for the fault and the localization of the defect before carrying out the necessary measurements. In some cases, defective elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. The resulting annular cracks in the soldering of the terminals of transformers or heating elements of the circuit are also frequent sources of many faults with the most diverse external manifestations.
Sometimes the TV TOSHIBA 19EL934RB just 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 a malfunction is the failure of the general power supply module DPS-30SP. In case it is in good condition, it is necessary 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 filters of the secondary rectifiers and the fuse at the input of the network. If it is interrupted, then you should check for breakdown of PN junctions of the diodes of the rectifier bridge and the key transistor of the converter, which can either be on a separate radiator or integrated with the PWM controller into a common chip. Possible options.
It should be remembered that in the practice of repair, power switches in a switching power supply (SMPS) usually 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 cause of the accident is 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 the TV is turned on, the image appears and disappears immediately, or is missing initially when it is turned on, but there is sound and other functions work, there is a high probability of a malfunctioning LED driver (LC185EXE-TEA1 LED backlight power supply converter). In such cases, the common power supply module is also checked, in which the electrolytic capacitors of the rectifier filter supplying the LED driver should be checked. 
To check the health of LEDs and contact connections in their power supply circuit, disassembly of the panel is necessary.
It should be remembered that to determine the break in the line of LEDs, without disassembling the panel, using a tester or multimeter is not possible without an additional device, for example, a current source. To open at once all PN transitions connected in series, a voltage of several tens of volts may be required.
Repair of the motherboard 32AV933 must begin with the diagnosis and testing of all linear stabilizers or power converters of its chips. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM. 
When repairing an MB card, it is necessary to check its components MST3704PX-LF-VW, TAS5707L. Faulty items should be replaced. If BGA chips are installed, their malfunction is usually localized by warming up. If chips with BGA soldering technology are used, the problem in its implementation is detected by the method of local heating of the chip. 
If a TDTK-G641D (U) tuner is suspected of malfunction, first of all it is necessary to make sure that the varicaps supply voltage (30-33V) is available at the corresponding output of the tuner, as well as other voltages supplied to it.
Typical defect of the motherboard  32AV933 : The 
TV does not go into operating mode, the red indicator on the panel lights up, DO NOT POWER OFF SCAN and the scanning scale appear upside down. It takes a scan from 0 to 100%, then again starts from 0% and everything is in a circle. Replacing software from the official site via USB does not help. Requires replacement and flashing of SPI FLASH 25Q64. Firmware options are attached. Chip SPI FLASH manufacturer Winbond must be replaced with a new one.

Attention! Users and owners of TVs 19EL934RB, who do not have the appropriate qualifications, knowledge and experience, strongly discourage attempts at self-repair in order to avoid negative consequences that may lead to complete overhaul of the device.

Download: Schematic and service manual Toshiba 19-40 / AV / LV / EL / HL / 933 Main 32AV933
TOSHIBA Power Supply DPS-30SP 19EL934RB 
Firmware FLASH TOSHIBA 26EL933RB, Main: Option 1 32AV933
Firmware FLASH TOSHIBA 26EL933RB, Main: Option 2 32AV933
Firmware SPI FLASH TOSHIBA 19EL933RB, Main: 32AV933 REV: 1.02

Additional Repair MainBoard

The appearance of the MainBoard 32AV933 is shown below:

32AV933
32AV933 can be used in televisions:
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- SEA101, TOSHIBA TOSHIBA 32L2454RB 32L2453RB (Panel LC320EUJ (FF) (E2)).
Power Supply Appearance 
The main features of the device TOSHIBA 19EL934RB:
The matrix (LED panel) of LC185EXE-TEA1 is installed. 
A converter combined with a power supply is used to power the backlight LEDs and is controlled by a PWM controller OZ9998BDN (16). 
The formation of the necessary supply voltages for all nodes of the TOSHIBA 19EL934RB TV is carried out by the DPS-30SP power supply module, or its analogues using the chips DDA014, D101, DDA010 (= ICE2QR0665 Standby). 
MainBoard - the main board (motherboard) is a 32AV933 module, using MSD3704PX-LF-VW, TAS5707L, 25Q64FVSIG, H5PS5162GFR and others chips. 
Tuner TDTK-G641D (U) provides reception of television programs and tuning to the channels.
Additional panel technical information:
Brand: LG Display 
Model: LC185EX-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

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