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Repair of the TOSHIBA 22EL833R TV

Material is added to the pages as data is accumulated from available technical documentation, personal authoring experience, and from masters of repair forums.

Technical description and composition of the TV TOSHIBA 22EL833R, panel type and modules used. The composition of the modules.

Model: 22EL833R
Chassis / Version: 17MB60
Panel: LC216EXN-SDA1 / LC216EXN-SCA1
LED driver (backlight): VESTEL LED Converter
PWM LED driver: MP3389 (28), MP3388
Power Supply (PSU): 17PW05-3 VESTEL 20548772 75024776
PWM Power: ICE3BR1765J (Standby), CAT7581
MOSFET Power: AO4842 (8)
MainBoard: 17MB60-3.1 // 17MB60.4.1
IC MainBoard: CPU: MSD9WB7PX; DRAM: HY5PS121621C; NAND Flash: NAND512-A
Tuner: DTOS403LH122E
Control: CT-90326, 19EL833B, 30070505 75024755

Close specifications! Learn more ...
Screen diagonal:22 "(56 cm)
Screen Format:16: 9
LED backlight:there, Edge LED
HD support:720p HD
Brightness:300 cd / m2
Contrast:1000: 1
Viewing angle:178 °
Pixel response time:9 ms
Progressive scan:there is
TV standards:PAL, SECAM, NTSC
Digital tuner:DVB-T MPEG4, DVB-C
Teletext:with 1000 page memory
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, audio x2, component, SCART, RGB, VGA, HDMI x2, USB
Headphone jack:there is
TV weight:with stand: 4.6 kg 
without stand: 3.9 kg
Dimensions:with stand 530x467x159 mm 
without stand 530x341x35 mm
Network consumption:25 W

General recommendations for the repair of TV LCD LED

Repair of electronic equipment usually begins with its external examination and fault diagnosis. In this case, you should examine all the internal components of the TV TOSHIBA 22EL833R, as well as the external elements of the body. 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.
If the TV 22EL833R does not turn on, does not make any sounds when it is turned on, and does not light or blink on the front panel, no indicators blink, 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. In the absence of swollen capacitors of the secondary rectifier filter, diagnostics of the power supply should be started by checking the fuse and, if it breaks, first of all check all power semiconductor elements of the primary circuit - diodes and transistors AO4842 (8) for the probability of avalanche or thermal breakdown.
In most cases, the breakdown of keys in a switching power supply (SMPS) does not happen without a reason, and you should look for other faulty circuit elements that could provoke a defect. This may be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible marriage IC chip ICE3BR1765J (8), CAT7581, from the manufacturer.
Sometimes the TOSHIBA 22EL833R 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 LC216EXN-SDA1, 30070328 75026245 // LC216EXN-SCA1, 30070334 75024777, or a break 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.
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.
On the motherboard 17MB60-3.1 22EL833R, 20568557 75026251, 20554907 75026252, in the event of a malfunction, first of all you should check the operation of all the stabilizers or power converters of the chips and, if necessary, update the software (software). 

If the TV works normally from external devices, but is not tuned to TV channels, the DTOS403LH122E tuner may be faulty. In such cases, first of all, you should make sure that the supply voltage is available at its respective terminals, as well as the power supply of the varicaps (30-33V).
Attention users! Self-repair of a TOSHIBA 22EL833R TV without the appropriate qualifications and experience may lead to its complete incompetence!

Download: Main VESTEL 17MB60
LC216EXN-SDA1 (30070328 75026245) service manual and schema // LC216EXN-SCA1 (30070334 75024777)

Additional Repair MainBoard

The appearance of the MainBoard 17MB60-3.1 is shown below:

The motherboard 17MB60-3.1 is made using an MSD9WB7PX-2 processor combined with a scaler. For its operation, two external memory chips (DDR) HY5PS121621C and a read-only memory (ROM) NAND512-A are used. To provide power for the processor, stabilizers 1.2V, 2.5V, 3.3V are used. For DDR, the voltage is 1.8V, to power the NAND 3.3V. Repair is advisable to start with checking the power standby mode (Stand-by) 3.3V. Further, in the operating mode, it is necessary to check the performance of all linear stabilizers and voltage converters. If there is a backlight and no image, the power of the LCD panel 5V or 12V, depending on the type of panel used, can be measured directly on the LVDS connector. Typical malfunction - NAND ROM software crash. At the same time, the TV does not turn on and blinks with indicators on the panel. It is updated via the USB port, if the software of the SPI FLASH chip in which the bootloader is located is not damaged, or if there is an mboot.bin file on the media, which can be used as regular SPI FLASH content.
17MB60-3.1 can be used in TVs:
TOSHIBA 19DL834R (Panel V185B1-LE2 30070337), TOSHIBA 22DL833R 22DL834R (Panel LC216EXN (SD) (A1)), TOSHIBA 22EL833R (Panel LC216EXN-SDA1 / LC216EXN-SCA1); TOSHIBA 19DL833R (Panel V185B1-LE2 REV. C1).
Power Supply Appearance 
The main features of the device TOSHIBA 22EL833R:
The matrix (LED panel) of the LC216EXN-SDA1 / LC216EXN-SCA1 is installed. 
The VESTEL LED driver is used to power the backlight LEDs and is controlled by the MP3389 (28), MP3388 PWM controller. 
The formation of the necessary supply voltages for all nodes of the TOSHIBA 22EL833R TV is provided by the power supply module 17PW05-3, or its analogues using ICE3BR1765J (Standby), CAT7581 chips and power switches of type AO4842 (8). 
MainBoard - the main board (motherboard) is a 17MB60-3.1 module, using CPU chips: MSD9WB7PX; DRAM: HY5PS121621C; NAND Flash: NAND512-A and others. 
Tuner DTOS403LH122E provides reception of television programs and tuning to the channels.

Additional technical information about the panel:
Brand: the LG the Display 
Model: LC216EXN-sda1 
the Type: of Si-a the TFT-LCD, Plesk Panel 
's Diagonal size bed: 21.6 inch 
Resolution: 1366x768, a WXGA 
the Display-Mode: the IPS, Black Normally, Transmissive 
the Active Area: 477.417x268. 416 mm 
Surface: Antiglare (Haze 13%), Hard coating (3H) 
Brightness: 300 cd / m² 
Contrast Ratio: 1000: 1 
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 68% 
Response Time: 6 (G to G) 
Frequency: 60Hz 
Lamp Type: WLED Embedded (LED Driver) 
Signal Interface: LVDS (1 ch, 8-bit), 30 pins 
Voltage: 5.0 ± 0.5V


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