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Repair of the TOSHIBA 19KL933R TV

Technical description and composition of the TV TOSHIBA 19KL933R, panel type and modules used. The composition of the modules.

Model: 19KL933R
Chassis / Version: VESTEL 17MB62 19KL934R
Panel: LTA185AT01
LED driver (backlight): 75029680 PC BOARD ASSY, CONTROL, 23026343
Power Supply (PSU): 75029541 POWER MODULE, 22BL702B, 23023938
PWM Power: ICE3BR1765J (Standby), CAT7581 (8)
MOSFET Power: FDC642P (6), AO4802 (8)
MainBoard: 17MB62-2.5
Tuner: SUT-RE216TN
Control: 75026257 REMOCON HAND UNIT, CT-8023, 19DL833B, 20548798, RC-1911/300070524

Specifications 19KL933

General recommendations for the repair of TV LCD LED

Repair and diagnostics of any electronic device, in particular TOSHIBA 19KL933R 934R, it is advisable to start with a careful external examination of internal and external elements. 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. Experienced repairmen often guess the causes of the defect and the possible consequences, for example, of ring cracks in the rations of elements, as well as of swollen capacitors or resistors burned to coal dust and other external indirect signs.
If the 19KL933R 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. Diagnostics and repair of a common power supply should always begin with checking the main fuse and the state of the electrolytic capacitors of the secondary rectifier filters. Faulty and blown-up capacitors should be replaced with new ones. When the fuse breaks, it is advisable to check for breakdown, first of all, all the power semiconductor elements of the converter and the rectifier diode bridge of the network, as well as a large electrolytic capacitor of the network rectifier filter.
It should be borne in mind that in the practice of repair it is extremely rare for key transistors in a switching power supply (SMPS) to fail without reason, which should be sought by checking other components, for example, breaking a key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or broken primary resistors BP chains involved in the stabilization process. In this case, all semiconductor elements of the PWM-controller IC IC3BR1765J (8), CAT7581 (8), AO4802 (8) IC are subject to verification, which should be checked by replacing.
Sometimes the TOSHIBA 19KL933R has no picture, but there is sound, or the picture will appear and disappear immediately. In this case, there is a high probability of malfunctioning of the LED backlight converter panel 75025152 LCD PANEL, LTA185AT01, or an open circuit in the LED circuit is possible. In such cases, first of all, it is necessary to make sure that all electrolytic capacitors of the filter are serviceable by the power supply of the LED driver itself, including the power supply unit (power supply unit). 
Often there is a need to disassemble the panel to check the health of the LEDs, as well as the contact connections in the connectors and soldering.
To check the lines of LEDs for breakage without disassembling the panel will help, for example, a current source. It is impossible to open sequentially connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
Repair or diagnostics of the motherboard 75029698 PC BOARD ASSY, MAIN, 23030938, 75029696 DVD MODULE, 23026361 should be started by checking the stabilizers or power converters of its chips. If necessary, you should update the software (software).
Owners and users of the TOSHIBA 19KL933R TV must remember that self-repair without special knowledge, skills and qualifications may be fraught with negative consequences that may lead to complete non-repair of the device!

Download: schema and service manual :

Additional Repair MainBoard

The appearance of the MainBoard 17MB62-2.5 is shown below:

The 17MB62-2.5 motherboard is manufactured using an MSD9WB9PT-2 processor combined with a scaler. For its operation, the operating memory (DDR) K4T1G164QF or HY5PS121621C and the read-only memory (ROM) NAND512-A are used. DC / DC converters with output voltages of 1.2V, 2.5V, 3.3V are used to power the processor. For DDR, the voltage is 1.8V, to power the NAND either 1.8 or 3.3V. Repair is advisable to start with checking the supply voltage in standby mode (Stand-by) 12V, 5V and 3.3V. Further, in the operating mode, it is necessary to check the performance of all linear stabilizers and DC / DC voltage converters used to power the MB and LCD panel chips. If there is a backlight and no image, depending on the type of panel used,
A typical malfunction of this board is a software crash (software) NAND. At the same time, the TV does not turn on and blinks alternately with indicators on the panel. If the software of the SPI FLASH chip in which the bootloader is intact is not damaged, NAND is updated via the USB port by the regular software. Otherwise, it makes sense to try downloading the software if there is an mboot.bin file on the media, as which you can use the regular content of SPI FLASH.
17MB62-2.5 can be used in TVs:
TOSHIBA 19KL933R (Panel LTA185AT01), TOSHIBA 32KL933R (Panel LTA320AN12 T01), TOSHIBA 26KL933R (Panel LC260EXN (SD) (A3)), TOSHIBA 23KL933R (Panel LTM230HT10).
The main features of the device TOSHIBA 19KL933R:
The matrix (LED panel) LTA185AT01 is installed. 
The LED driver 75029680 is used to power the backlight LEDs. 
The necessary supply voltages for all nodes of the TOSHIBA 19KL933R TV are provided by the 75029541 power supply module or its analogues using ICE3BR1765J (Standby), CAT7581 (8) chips and FDC642P (6) power switches, AO4802 (eight). 
MainBoard - the main board (motherboard) is a 17MB62-2.5 module. 
Tuner SUT-RE216TN provides reception of television programs and tuning to the channels.
Additional panel technical information:
Model: LTA185AT01 
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: 230 cd / m² 
Contrast Ratio: 800: 1 
Display Colors: 16.7M (8-bit), CIE1931 72% 
Response Time: 6 (Tr + Td) 
Frequency: 60Hz 
Lamp Type: 21S1P WLED Without Driver 
Signal Interface: LVDS (1 ch, 8-bit), 30 pins 
Voltage: 5.0V


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