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Repair of the TOSHIBA 23KL933R TV

Technical description and composition of the TV TOSHIBA 23KL933R, panel type and modules used. The composition of the modules.

Model: 23KL933R
Panel: LTM230HT10
T-CON: LTM230HT10S2LV0.5_HF; LUU4321M3R-05, SM4106, 17014HS
LED driver (backlight): 17CON08-2
PWM LED driver: TPS61199
MOSFET LED driver: MDD1903
Power Supply (PSU): 17PW80
PWM Power: G1143LOP (8), ICE3BR0665J (Standby),CAT7581 (8)
MainBoard: 17MB62-2.5
IC MainBoard: K4T1G164QF-BCF8, 25Q80BVSIG, NAND512WEA2DN6
Tuner: SUT-RE216TN H 2A212E
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:1080p Full HD
Brightness:300 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

Possible faults

- The TOSHIBA 23KL933R TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
In such cases, the 17PW80 power supply may be faulty. It is necessary to measure its secondary output supply voltages, and in the case of their absence, the operability of the power switches of the converters and rectifier diodes should be checked for the probability of breakdown in semiconductor PN junctions. 
In case of thermal and avalanche breakdowns of semiconductors in secondary circuits, the converter can usually operate normally in an emergency short circuit mode. There are no output voltages. And with short circuits in the power elements of the primary circuit, as a rule, the mains fuse is broken, and less frequently the current sensor in the source of the key.
Mos-Fet keys used in switching power supplies usually fail due to malfunction of other elements that can take it out of work in a key mode, or cause the current or voltage to exceed maximum values. These can be power supply, damping circuits, or elements of environmental protection (negative feedback) stabilization. The cause of the breakdown of the power switch may be, for example, PWM (GW43) G1143LOP (8), ICE3BR0665J (Standby), CAT7581 (8). A PWM controller is usually checked by replacing it with a known good.
- There is no image, there is sound, it responds to the remote. Or the image may appear for a second when turned on and disappears immediately.
Fault in most of these cases is found in the nodes and elements of the backlight of the LED panel. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply. 
Without a special current source, it is impossible to check the series of series-connected LEDs, and it is not safe to use any voltage sources over 12V for this purpose. Then it remains only to open the panel and check each LED separately. Usually, Chinese multimeters with 9V power slightly illuminate one 3-volt LED, if you connect the probes in the forward direction to it, the red probe to the anode, the black one to the cathode. In dual 6-volt LEDs, the PN junction of its emergency Zener diode can serve as an indicator of the health of the LED. In the event of a LED malfunction, its zener diode will either be cut off or broken into C / 3.
- The TV does not turn on, the indicator signals the standby or working mode, or it blinks.
Repair or diagnostics of the motherboard 17MB62-2.5 should begin by checking the stabilizers and power converters necessary to power the chips and the matrix. If necessary, update or replace the software (software). Sometimes they require checking or replacing (if necessary) the elements of the MainBoard card - K4T1G164QF-BCF8, 25Q80BVSIG, NAND512WEA2DN6. In cases of using a BGA processor, its malfunction is usually detected by a local warm-up method.
If you suspect a malfunction of the SUT-RE216TN H 2A212E tuner, you first need to make sure the correctness of the software, as well as the availability of the necessary supply voltage levels and data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.
Once again we remind users! Attempts to repair the TOSHIBA 23KL933R TV on your own without proper qualifications and the necessary experience can lead to its complete inconvenience!

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).
Power Supply Appearance 
The main features of the device TOSHIBA 23KL933R:
Installed matrix (LED-panel) LTM230HT10. 
Timing Controller (T-CON) LTM230HT10S2LV0.5_HF; is used in matrix management. 
The LED driver 17CON08-2 is used to power the backlight LEDs. It is controlled by the TPS61199 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 TV TOSHIBA 23KL933R is carried out by the power supply module 17PW80, or its analogues using the chips G1143LOP (8), ICE3BR0665J (Standby), CAT7581 (8). 
MainBoard - the main board (motherboard) is a 17MB62-2.5 module, using K4T1G164QF-BCF8, 25Q80BVSIG, NAND512WEA2DN6, and others. 
Tuner SUT-RE216TN H 2A212E provides reception of television programs and tuning to the channels.

Information from an alternative source:

panel type (matrix): LTM230HT10 
motherboard : 17MB62-2.5, K4T1G164QF-BCF8, 25Q80BVSIG, NAND512WEA2DN6, Tuner: SUT-RE216TN H 2A212E 
T-con : LTM230HT10S2LV0.5_HF, LUU4321M3R-05, SM4106, 17014HS 
Invertor : 17CON08- 2, TPS61199, MDD1903 
PSU : 17PW80, ICE3BR0655J 
Remote control : CT-8023

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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