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Repair of the TOSHIBA 23EL934RK TV

Technical description and composition of the TV TOSHIBA 23EL934RK, panel type and modules used. The composition of the modules.

Model: 23EL934RK 23EL933RK
Chassis / Version: 32AV933
Panel: LTM230HT10
LED driver (backlight): integrated into PSU
PWM LED driver: OZ9998BGN
MOSFET LED driver: AOD482
Power Supply (PSU): UE-3470-1SUN-LF
PWM Power: 6754MR (8pin), M101 (6pin)
MOSFET Power: TF7N70, P1504EDG
MainBoard: 32AV933 BD REV: 1.02
IC MainBoard: CPU: MSD3704PX-LF-VW; SPI Flash: W25Q64FVSIG
Tuner: TDTK-G641D (U)

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:250 cd / m2
Dynamic contrast:1,000,000: 1
Viewing angle:178 °
Pixel response time:14 ms
Progressive scan:there is
TV standards:PAL, SECAM, NTSC
Digital tuner:DVB-T MPEG4, DVB-C
Teletext:with memory on 100 p.
DTV Formats:480i, 480p, 576i, 576p, 720p, 1080i, 1080p
Stereo sound:there is
Sound power:6 W (2x3 W)
Acoustics:two speakers
Interface:AV, component, SCART, RGB, VGA, HDMI x2, USB
Headphone jack:there is
TV weight:with stand: 3.5 kg 
without stand: 3.2 kg
Dimensions:with stand 552x380x160 mm 
without stand 552x344x37 mm
Network consumption:36 W

General recommendations for the repair of TV LCD LED

Repair of the TOSHIBA 23EL934RK TV is advisable to begin with a careful external examination of both internal and external elements. Sometimes, by visible changes in the components of the device, it is possible to draw some conclusions and decide on the direction of further troubleshooting even before the start of 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 power supply module UE-3470-1SUN-LF malfunctions, the external manifestations may be different, for example, TOSHIBA 23EL934RK does not turn on at all and there is no indication of the indicator lights on the front panel. With the same symptoms, the stabilizer (converter) of the power supply to the control processor may be faulty. When diagnosing and repairing the power supply, you should first replace the swollen capacitors of the secondary rectifier filter and check the fuse and, if it is interrupted, you must identify the cause. Often in such cases avalanche (thermal) breakdown is detected in the power semiconductor elements of the module - rectifier diodes and TF7N70, P1504EDG, AO D482 transistors in the primary circuit.
If the breakdown of the power switch is detected, it should be remembered that in a pulsed power source (SMPS) it does not break down by itself without any reason, which should be sought by checking other elements of the primary circuit, - electrolytic capacitors, PWM controller 6754MR (8), M101 1147 (6), which can only be checked by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
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 (panel 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. 
To check the health of the LEDs, as well as contact connections in the chain of lines, disassembly of the panel is necessary. 
Check the line of LEDs for breakage without disassembling the panel is impossible with a multimeter or tester. For these purposes, it is necessary to open all sequentially connected PN junctions and a voltage of the order of tens of volts will be required, and ideally a current source.

Attention! Users and owners of 23EL934RK TVs, who do not have the appropriate qualifications, knowledge and experience, strongly discourage attempts at self-repair in order to avoid negative consequences that may lead to complete non-repairability of the device.

Download: Scheme and service manual :

Additional Repair MainBoard

The appearance of the MainBoard 32AV933 is shown below:

32AV933 can be used in televisions:
TOSHIBA 19EL934RB 19EL933RB (Panel LC185EXE-TEA1), TOSHIBA 23EL934RK 23EL933RK (Panel LTM230HT10), TOSHIBA 26EL933RB (Panel LC260EXN-SDA3 75023140), TOSHIBA 32AV933RB 32AV934RB (Panel LC320WXN-SCC1), TOSHIBA 32EL933RB (Panel LC320EXN SE A1 75030579 LCD PANEL LC320EXN- SEA101, TOSHIBA TOSHIBA 32L2454RB 32L2453RB (Panel LC320EUJ (FF) (E2)).
The main features of the device TOSHIBA 23EL934RK:
Installed matrix (LED-panel) LTM230HT10. 
A converter combined with a power supply unit is used to power the backlight LEDs, which is controlled by a PWM controller OZ9998BGN. As power elements of the LED driver, keys of type AOD482 are used. 
The formation of the necessary supply voltages for all nodes of the TOSHIBA 23EL934RK TV is provided by the UE-3470-1SUN-LF power supply module, or its analogues using 6754MR (8pin), M101 (6pin) chips and TF7N70, P1504EDG power switches. 
MainBoard - the main board (motherboard) is a 32AV933 module, using CPU chips: MSD3704PX-LF-VW; SPI Flash: W25Q64FVSIG and others. 
Tuner TDTK-G641D (U) provides reception of television programs and tuning to the channels.

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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