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Repair of the TOSHIBA 19DL834R TV

Technical description and composition of the TV TOSHIBA 19DL834R, panel type and modules used. The composition of the modules.

Model: 19DL834R
Chassis / Version: 17MB
Panel: V185B1-LE2 30070337
LED driver (backlight): 17CON07-2 120111 Vestel
Power Supply (PSU): 17PW05-03 75024747 20551413
PWM Power: G1115LOP (8), ICE3BR0665 (Standby)
MainBoard: 17MB60-3.1 75026094 20563033
IC MainBoard: DVD SA5888, MT1389DE
Tuner: DTOS403LH122E
Control: CT-8023 75026257 20548798

Specifications 19DL834

General recommendations for the repair of TV LCD LED

It is recommended to begin the diagnosis and repair of TOSHIBA 19DL834R, as well as other electronic devices, with an external inspection of external and internal components. Visible damage to the elements can sometimes indicate the direction of the search for a defect even before the start of 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.
If the 19DL834R TV does not turn on, does not make any sounds when it is turned on, and do not light or blink on the front panel, there is a high probability of a malfunction in the power module. In some cases, only the stabilizer or the power converter of the control processor may be faulty, which is typical of some TOSHIBA models. It is advisable to start the diagnostics of the failure of the power supply module by checking the condition of the electrolytic capacitors of the rectifier filters and the mains fuse. Faulty capacitors should be replaced. In case the network fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifying diodes and transistors, which are often found in such situations in the breakdown state.
In most cases, the breakdown of keys in a switching power supply (SMPS) does not happen without a reason, and you should look for other faulty circuit elements that could provoke a defect. This may be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible marriage chip PWM G1115LOP (8), ICE3BR065 (8) from the manufacturer.
If the TOSHIBA 19DL834R does not have an image, but there is sound and the TV is controlled from the console, there may be a malfunction in the backlight of the panel V185B1-LE2, 30070337. The LEDs or the power converter - LED driver may be faulty. Often in such cases, when you turn on the TV, the image appears and disappears immediately. First of all, it is necessary to make sure that the electrolytic capacitors of the filter of the rectifier supplying the LED driver are in good order and check the LEDs by connecting known good ones for diagnostics. 
To check the health of the LEDs, as well as contact connections in the chain of lines, disassembly of the panel is necessary.
To identify a break in the line of LEDs without disassembling the panel will require a current source. Open transitions connected in series, a simple multimeter is impossible, you need a voltage of several tens of volts.
On the motherboard 17MB60-3.1 75026094 20563033, in the event of a malfunction, you should first check the operation of all the stabilizers or power converters for the microchips and, if necessary, update the software (software). 
When repairing an MB card, it is necessary to check its components DVD SA5888, MT1389DE. 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. 
Before replacing the DTOS403LH122E tuner, if there is no tuning for channels, first you need to check the supply voltage at its terminals, including the power supply of the varicaps (30-33V).
Attention to the owners! Attempts to repair the TOSHIBA 19DL834R TV by yourself are not recommended by the manufacturer and can lead to serious negative consequences!

Download: Scheme and service manual :

Additional Repair MainBoard

The appearance of the MainBoard 17MB60-3.1 is shown below:

The motherboard 17MB60-3.1 is made using an MSD9WB7PX-2 processor combined with a scaler. For its operation, two external memory chips (DDR) HY5PS121621C and a read-only memory (ROM) NAND512-A are used. To provide power for the processor, stabilizers 1.2V, 2.5V, 3.3V are used. For DDR, the voltage is 1.8V, to power the NAND 3.3V. Repair is advisable to start with checking the power standby mode (Stand-by) 3.3V. Further, in the operating mode, it is necessary to check the performance of all linear stabilizers and voltage converters. If there is a backlight and no image, the power of the LCD panel 5V or 12V, depending on the type of panel used, can be measured directly on the LVDS connector. Typical malfunction - NAND ROM software crash. At the same time, the TV does not turn on and blinks with indicators on the panel. It is updated via the USB port, if the software of the SPI FLASH chip in which the bootloader is located is not damaged, or if there is an mboot.bin file on the media, which can be used as regular SPI FLASH content.
17MB60-3.1 can be used in TVs:
TOSHIBA 19DL834R (Panel V185B1-LE2 30070337), TOSHIBA 22DL833R 22DL834R (Panel LC216EXN (SD) (A1)), TOSHIBA 22EL833R (Panel LC216EXN-SDA1 / LC216EXN-SCA1); TOSHIBA 19DL833R (Panel V185B1-LE2 REV. C1).
The main features of the device TOSHIBA 19DL834R:
A matrix (LED panel) V185B1-LE2 30070337 
is installed. The LED driver 17CON07-2 is used to power the backlight LEDs. 
The formation of the necessary supply voltages for all nodes of the TOSHIBA 19DL834R TV is provided by the power supply module 17PW05-03, or its analogues using ICs G1115LOP (8), ICE3BR0665 (Standby). 
MainBoard - the main board (motherboard) is a 17MB60-3.1 module, using DVD chips SA5888, MT1389DE and others. 
Tuner DTOS403LH122E provides reception of television programs and tuning to the channels.
Additional technical information on the panel:
Model: V185B1-LE2 
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 (Haze 25%), Hard coating (3H) 
Brightness: 250 cd / m² 
Contrast Ratio: 1000: 1 
Display Colors: 16.7M (8-bit), CIE1931 70% 
Response Time: 1.3 / 3.7 (Tr / Td) 
Frequency: 60Hz 
Lamp Type: 14S8P WLED Without Driver 
Signal Interface: LVDS (1 ch, 8-bit), 30 pins 
Voltage: 5.0V


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