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Repair of the TOSHIBA 19EL833R TV

Technical description and composition of the TV TOSHIBA 19EL833R, panel type and modules used. The composition of the modules.

Model: 19EL833R
Chassis / Version: 17MB60 VESTEL
Panel: V185B1-LE2 LED
LED driver (backlight): 17CON07-2 VESTEL
PWM LED driver: 3389DR
Power Supply (PSU): 17PW05-3 VESTEL
PWM Power: ICE3BR0665J (Standby)
MainBoard: 17MB60-4
IC MainBoard: MSD9WB9PX-LF-2, MX25L8005, W971GG6JB-18, K9F1208UOC, TPA3113, DTOS403LH122E
Tuner: DTDS403LH122E
Control: CT-90326

Technical characteristics 19EL833

General recommendations for the repair of TV LCD LED

Repair of electronic equipment usually begins with its external examination and fault diagnosis. In this case, you should examine all the internal components of the TV TOSHIBA 19EL833R, as well as the external elements of the body. Many visible changes in the state of the elements make it possible to determine the future direction of the fault finding and the localization of the defect. If ring cracks are detected in the soldering of the terminals of the elements or dangling connecting tracks, swollen capacitors or charred resistors - all this may be characteristic signs of the causes or consequences of an already known typical malfunction.
In the case when the 19EL833R does not turn on, does not respond to the remote control and the front panel buttons, does not blink and does not show any signs of operability, it is likely that the power supply module 17PW05-3 VESTEL is faulty in this case. In case of its serviceability with such manifestations, it is necessary to check the stabilizer (converter) of the processor power supply on the motherboard. When diagnosing and repairing the power supply, after replacing the bloated capacitors of the filters of the secondary rectifiers (if any), you must first check the power fuse. When it is broken, you should check the power elements of the transistors and diodes of the rectifier bridge for avalanche (thermal) breakdown.
The reasons for the breakdown of a power switch in a switching power supply (SMPS) can be different, for example, a malfunction of semiconductor elements or electrolytic capacitors in the primary circuit stabilization circuits, as well as a failure in the operation of the PWM regulator chip or breaks of resistors in its piping.
If when the TV is turned on, the image appears and disappears immediately, or is missing initially when turned on, but there is sound and other functions work, there is a high probability of a malfunctioning LED driver (V185B1-LE2 LED backlight power 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 the LEDs, as well as contact connections in the chain of lines, disassembly of the panel is necessary. 
A break in the lines of LEDs connected in series to detect using a multimeter or a tester is impossible without disassembling the panel. To open all the transitions, you need a few tens of volts, and it is best to use a current source for such purposes.
On the 17MB60-4 motherboard, in the event of a malfunction, you should first check the operation of all the stabilizers or power supply circuits of the microchips and, if necessary, update the software (software). 

Before changing the tuner DTDS403LH12 tuner, if there is no possibility of tuning to the television channels, you should make sure that there are supply voltages, including power supply for the varicaps (30-33V), which need to be measured at the corresponding tuner outputs.
Remember! Attempts to self-repair users of the TOSHIBA 19EL833R TV without appropriate qualifications and the necessary experience can lead to serious negative consequences!

Download: Scheme and service manual :

Additional Repair MainBoard

The appearance of the MainBoard 17MB60-4 is shown below:

The 17MB60-4 motherboard is manufactured 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.
17MB60-4 can be used in TVs:
SHARP LC-19LE510RU (Panel LC185EXN (SD) (A1)), SHARP LC-22LE510RU (Panel 22 inches), SHARP LC-32LE510RU (Panel LC320EUN SD V1), SHARP LC-32SH130E (Panel LC320WXN / 720p HD), SHARP LC -32SH340 LC-32SH340E (Panel LC320WUN (SC) (B1)), TOSHIBA 19EL833R (Panel V185B1-LE2 LED), TOSHIBA 26LD833F (Panel LC260EXN (SD) (A3)), TOSHIBA 32DL833R 32DL834RDR-33RR-33RRRRRR (R3 (A3)).
Power Supply Appearance 
The main features of the device TOSHIBA 19EL833R:
Installed matrix (LED-panel) V185B1-LE2 LED. 
The LED driver 17CON07-2 is used to power the backlight LEDs. It is controlled by a 3389DR PWM controller. 
The formation of the necessary supply voltages for all nodes of the TOSHIBA 19EL833R TV set is performed by the power supply module 17PW05-3, or its analogues using ICE3BR0665J (Standby) chips. 
MainBoard - the main board (motherboard) is a 17MB60-4 module, using MSD9WB9PX-LF-2, MX25L8005, W971GG6JB-18, K9F1208UOC, TPA3113, DTOS403LH122E, and others chips. 
The DTDS403LH122E tuner 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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