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Repair of the TOSHIBA 22DL833R 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 22DL833R, panel type and modules used. The composition of the modules.

Model: 22DL833R 22DL834R
Panel: LC216EXN (SD) (A1)
LED driver (backlight): 17PW05-3
PWM LED driver: 1579 (8)
MOSFET LED driver: MDS5652 (8)
Trans LED driver: 30067936 SMP-C2776
Power Supply (PSU): 17PW05-3
PWM Power: ICE3BR0665J (Standby)
MainBoard: 17MB60-3.1
IC MainBoard: CPU: MSD9WB7PX; DRAM: HY5PS121621C; NAND Flash: NAND512-A;
Tuner: DTOS403LH122E
Control: CT-8023

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
Dynamic contrast:3,000,000: 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
Number of channels:100
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, SCART, RGB, VGA, HDMI x2, USB
Headphone jack:there is
TV weight:with stand: 4.3 kg 
without stand: 3.9 kg
Dimensions:with stand 530x375x155 mm 
without stand 530x340x55 mm
Network consumption:29 W

General recommendations for the repair of TV LCD LED

It is recommended to begin the diagnosis and repair of TOSHIBA 22DL833R, as well as other electronic devices, with an external inspection of external and internal components. Specific external damage to some elements can sometimes indicate further actions to determine the malfunction of the TV and localize the defect before starting the necessary measurements. In some cases, defective elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. The resulting annular cracks in the soldering of the terminals of transformers or heating elements of the circuit are also frequent sources of many faults with the most diverse external manifestations.
In cases when the TOSHIBA 22DL833R 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 17PW05-3 power supply module is probably faulty or is missing CPU power on the motherboard (typical defect of some TOSHIBA TVs). 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 transistors in the primary circuit.
Power switches in a switching power supply (SMPS) fail extremely rarely and, when they break down, it is necessary to look for a fault in the stabilization circuit by checking electrolytic capacitors, semiconductors and resistors in the primary circuit. The reason may be a malfunction of the ICE3BR0665J (8) PWM controller chip, which can only be checked by replacing it with a new one or a known good one.
In cases where the TOSHIBA 22DL833R has lost the image, but the sound is still functioning, the LED driver (converter for powering the LC216EXN (SD) (A1) backlight LED) has a malfunction. When you turn on the TV, the image may briefly appear and disappear immediately. It is necessary to take into account that the LEDs themselves also fail with such manifestations. 
To check the health of LEDs and contact connections in their power supply circuit, disassembly of the panel is necessary. 
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). 

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 and owners of TVs 22DL833R, 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 overhaul of the device.


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 22DL833R:
Installed matrix (LED-panel) LC216EXN (SD) (A1). 
The LED driver 17PW05-3 is used to power the backlight LEDs and is controlled by a 1579 PWM controller (8). A transformer 30067936 SMP-C2776 is installed in the LED driver converter. The keys of MDS5652 (8) type are used as the power elements of the LED driver. 
The formation of the necessary supply voltages for all nodes of the TOSHIBA 22DL833R TV set is carried out by the power supply module 17PW05-3, or its analogues using ICE3BR0665J microcircuits (Standby). 
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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