Technical description and composition of the TOSHIBA 23KL934R TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 23KL934R
Panel: LTM230HT10 75029655
LED driver (backlight): 17CON08-2TP4 HY CONTROL, 23026211 75029733
PWM LED driver: 22AH2LK TPS51199
MOSFET LED driver: MDD1903
Power Supply (PSU): 17PW80 V2 22BL702B, 23023938 75029541
PWM Power: ICE3BR0665J (Standby)
MainBoard: 17MB62-2.6 23KL933R, 23031122 75029794
Control: CT-8023
Specifications 23KL934
TOSHIBA 23KL934R
General repair guidelines for TV LCD LED
Repair of the TOSHIBA 23KL934R TV should begin with a careful external examination of all its components and modules. Often, based on certain external signs, it may be possible to draw certain conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. If charred resistors, swollen electrolytic or cermet capacitors, ring cracks in the solders of the terminals of transformers or heating elements are found, it is advisable to establish the causes and consequences of the malfunction that has arisen, as well as to check the connected elements and assemblies.
In cases when the TOSHIBA 23KL934R TV does not turn on, does not respond to the remote control and buttons, any indicators on the front panel do not light up or blink, and there are no sounds and no signs of operability when turning on, the power supply module 17PW80 V2 22BL702B, 23023938 is most likely to be faulty 75029541 or there is no processor power on the motherboard (a typical defect of some TOSHIBA TVs). In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the ICE3BR0665J PWM controller microcircuit (8) are subject to verification, which it is desirable to verify by replacement.
If, when you turn on the TV, the image appears and immediately disappears, or is missing initially when you turn on, but the sound has other functions that work, there is a high probability of a malfunction of the LED driver (power converter for the LED backlight panel LTM230HT10 75029655). 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.
In most cases of lack of backlight, it becomes necessary to disassemble the panel in order to check the LEDs, connectors, loops and all contact connections. If one or several LEDs does not work in one line, therefore, they are broken and should be replaced.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software).
For owners of the 23KL934R TV, we recommend that you contact qualified personnel with experience to repair! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba - Vestel Main 17MB62-2
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Power Vestel 17PW80 Schematic diagram
The appearance of the MainBoard 17MB62-2.6 is shown in the figure below:The 17MB62-2.6 motherboard is made using the MSD9WB9PT-2 processor, combined with a scaler. For its operation, random-access memory (DDR) K4T1G164QF, or HY5PS121621C, and NAND512-A read-only memory (ROM) are used. To ensure processor power, DC / DC converters with output voltages of 1.2V, 2.5V, 3.3V are used. For DDR, the voltage is 1.8V, for NAND it is either 1.8 or 3.3V. It is advisable to start the repair by checking the supply voltage in stand-by mode (12V), 5V and 3.3V. Further, in the operating mode, it is necessary to check the operability 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, its 5V or 12V power supply can be measured directly on the LVDS connector.
A typical malfunction of this board is a NAND software failure. 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 located, is not damaged, NAND is updated via the USB port with standard software. Otherwise, it makes sense to try downloading the software if there is a mboot.bin file on the media, which can be used as standard SPI FLASH content.
17MB62-2.6 can be used in TVs:
PHILIPS 19PFL2908H/60 (Panel HT185WX1-300), PHILIPS 22PFL2807H/60 (Panel LM215WF4 (TL)(G1)), PHILIPS 24PFL2908H/60 (Panel V236BJ1-LE1 Rev.C2), PHILIPS 22PFL2908H/60 (Panel M215HGE-L21 ), SHARP LC-22LE240RUX (Panel 22 "), SHARP LC-40LE240RUX (Panel LTA400HM13 C04), SHARP LC-32LE140RU LC-32LE140 (Panel LC320EXN), TOSHIBA 23KL934R (Panel LTM230HT10 75029655), TOSHIBA 32KL934R (Panel LTA320AN12 T01).
The appearance of the power supply
Key Features of the TOSHIBA 23KL934R:
Installed matrix (LED-panel) LTM230HT10 75029655.
The LED driver 17CON08-2TP4 is used to power the backlight LEDs, it is controlled by the 22AH2LK TPS51199 PWM controller. As power elements of the LED driver, keys of the MDD1903 type are used.
The necessary supply voltages for all nodes of the TOSHIBA 23KL934R TV are generated by the 17PW80 power module or its analogs using ICE3BR0665J (Standby) microcircuits.
MainBoard - the main board (motherboard) is a 17MB62-2.6 module.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTM230HT10
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.0 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 509.76x286.74 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 5 (Tr + Td)
Frequency: 60Hz
Lamp Type: 11S3P WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V