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Repair of the TOSHIBA 23KL934R TV

Technical description and composition of the TV TOSHIBA 23KL934R, panel type and modules used. The composition of the modules.

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

Close specifications! Learn more ...
Screen diagonal:23 "(58 cm)
Screen Format:16: 9
Update frequency:100 Hz
LED backlight:there, Edge LED
HD support:720p HD
Brightness:350 cd / m2
Dynamic contrast:3,000,000: 1
Viewing angle:170 °
Pixel response time:6 ms
Progressive scan:there is
TV standards:PAL, SECAM, NTSC
Digital tuner:DVB-T MPEG4, DVB-C
Teletext:there is
DTV Formats:480i, 480p, 576i, 576p, 720p, 1080i, 1080p
Stereo sound:there is
Sound power:5 W (2x2.5 W)
Acoustics:two speakers
Interface:AV, SCART, RGB, VGA, HDMI x2, USB
Headphone jack:there is
TV weight:with stand: 5 kg 
without stand: 4 kg
Dimensions:with stand 562x394x172 mm 
without stand 562x357x55 mm

General recommendations for the repair of TV LCD LED

Repair of the TOSHIBA 23KL934R TV should begin with a careful external examination of all its constituent elements and modules. Often, according to certain external features, it may be possible to draw certain conclusions about the reasons for the failure of certain circuit elements before carrying out the necessary measurements, which will make it possible to determine the further fault finding and localization of the defect. If charred resistors, swollen electrolytic or metal-ceramic capacitors, ring cracks in the soldering of the transformer or heating elements are detected, it is advisable to establish the causes and consequences of the malfunction, as well as to check the associated elements and components.
In cases when the TOSHIBA 23KL934R TV does not turn on, does not respond to the remote control and buttons, does not light or blink, there are no indicators on the front panel and there are no sounds and no signs of performance when you turn on - the power supply module 17PW80 V2 22BL702B, 23023938 most likely faulty 75029541 or there is no processor power supply on the motherboard (typical defect of some TOSHIBA TVs). In the absence of swollen capacitors of the filter of secondary rectifiers, the power supply diagnostics should be started by checking the fuse and, if it breaks, first of all it is necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the probability of avalanche or thermal breakdown.
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 the semiconductor elements of the PWM controller IC IC3BR0665J (8) are required for checking, which should be checked by replacing.
If the image appears and disappears when the TV is turned on, 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 (LTM230HT10 75029655 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. 
In most cases, the lack of illumination arises the need to disassemble the panel in order to test the LEDs, connectors, cables and all contact connections. If one or several LEDs do not work in the same line, therefore, they are pierced and should be replaced.
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.
When attempting to repair the motherboard, you should first check the serviceability of linear stabilizers or power supply circuits of the microcircuits and, if necessary, update the software (software).
Owners of the 23KL934R TV are advised to contact only qualified specialists with work experience for repairs! Attempts to repair yourself without proper knowledge and skills can lead to serious negative consequences!

Additional Repair MainBoard

The appearance of the MainBoard 17MB62-2.6 is shown below:

The 17MB62-2.6 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.
17MB62-2.6 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); , SHARP LC-22LE240RUX (Panel 22 inches), SHARP LC-40LE240RUX (Panel LTA400HM13 C04), SHARP LC-32LE140RU LC-32LE140 (Panel LC320EXN), TOSHIBA 23KL934R (Panel LTM230HT10, 75029655), TOSHIBA 23KL934R, TOSHIBA 23KL934R (Panel LTM230HT10 75029655), TOSHIBA 23KL934R, TOSHIBA 23KL934R
Power Supply Appearance 
The main features of the device TOSHIBA 23KL934R:
The matrix (LED panel) of the LTM230HT10 75029655 is installed. 
The LED driver 17CON08-2TP4 is used to power the backlight LEDs and is controlled by a 22AH2LK TPS51199 PWM controller. The keys of type MDD1903 are used as power elements of the LED driver. 
The formation of the necessary supply voltages for all nodes of the TOSHIBA 23KL934R TV set is carried out by the power supply module 17PW80, or its analogs using ICE3BR0665J (Standby) microcircuits. 
MainBoard - the main board (motherboard) is a 17MB62-2.6 module.
Additional panel technical information:
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


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