Technical description and composition of the TOSHIBA 42DB833R TV, type of panel and applicable modules. The composition of the modules.Toshiba
Model: 42DB833R
Chassis / Version: 32AV833
Panel: LC420EUN (SD) (V1) 75023049
Lamp backlight: 3660L-0374A 201 42 V6 Edge FHD-3 Rev1.0 L-Type / R-Type
T-CON: 6870C-0368A
Inverter (backlight): 6917L-0061A 3PEGC20008A-R PCLF-D002A Rev1.1
Power Supply (PSU): PE-4151-01UN-LF 75026434, (PE4101-01UN)
MainBoard: 32AV833 Rev1.03 75026446
IC MainBoard: TS-SR29 75026421 BD MODULE 1737-001P0TB
Tuner: TDTK-G641D
Specifications 42DB833
TOSHIBA 42DB833R
General recommendations for repairing TV LCD
Any repair of electronic equipment begins with an external inspection of the device and diagnostics of the malfunction. In this case, you should visually carefully examine all the elements of the TOSHIBA 42DB833R TV, both internal and external. Any external damage can sometimes prompt the repairman to take further steps to determine the malfunction of the TV and localize the defect. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when it is turned on, there is a certain chance that the power module PE-4151-01UN-LF 75026434, (PE4101-01UN) is defective and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of processor power, but this happens much less often. The diagnostics of the power supply should always be started by checking the fuse and, if it is broken, it is first necessary to check the rectifier bridge diodes and the power switch for the likelihood of an avalanche or thermal breakdown.
If a breakdown of the power switch of the flyback converter of the power supply unit is detected, it should be remembered that it does not fail without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, a PWM controller that can only be checked by replacement, as well as others semiconductor elements (diodes, transistors, zener diodes).
It is somewhat more difficult to look for a malfunction in the converter of the power module with an active KKM (power factor corrector).
In cases where the TOSHIBA 42DB833R TV has lost an image, and the sound is there and all the other functions are functional, there is a possibility of a malfunction of the inverter (converter for powering the backlight). When you turn on the TV, the image may appear briefly and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power.
Repair of the inverter 6917L-0061A 3PEGC20008A-R PCLF-D002A Rev1.1 can often be somewhat complicated by the use of special protection circuits, which are designed to disconnect it in emergency cases for fire safety when the lamps are depressurized, or short circuits or breaks in high-voltage circuits and connections. Sometimes it becomes necessary for diagnostic purposes to block the protection circuits in order to be able to make the necessary measurements at the control points of the circuit.
All necessary precautions must be observed when disabling the inverter protection during diagnostics and not leaving it disconnected after the repair is completed.
Repair of the motherboard 75026446 32AV833 Rev1.03 must begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM. In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its chips TS-SR29 75026421 BD MODULE 1737-001P0TB and other possible faulty components.
If the TV works normally from external devices, but does not tune into television channels, the TDTK-G641D tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals, as well as the power supply of varicaps (30-33V).
It should be remembered! Attempts to repair the TOSHIBA 42DB833R TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba Chassis 32AV833. Service manual and schematic diagram
The appearance of the MainBoard 32AV833 is shown in the figure below:32AV833
32AV833 can be used in TVs:
TOSHIBA 26EL833RB (Panel LC260EXN (SD)(A3) 75023140), TOSHIBA 26EL834RB (Panel LC260EXN SD A3), TOSHIBA 32AV833RB (Panel LC320WXN SCC1), TOSHIBA 32EL833G (Panel LC320EXN (SD)(A2)), TOSHIBA 32EL833R 32EL834R (Panel LC320EXN-SDA2 75023687 LCD PANEL), TOSHIBA 32HL833R (Panel LC320EUN SD V1 75022862 LED), TOSHIBA 32HL834R (Panel LC320EUN (SD)(V1)), TOSHIBA 32LV833RB (Panel T315HW04 V4), TOSHIBA 40LV833RB (Panel V400H1-L10), TOSHIBA 42DB833R (Panel LC420EUN (SD)(V1) 75023049), TOSHIBA 42HL833R (Panel LC420EUN (SD)(V1) LED 75023049), TOSHIBA 42HL834R (Panel LC420EUN (SD)(V1)).
Main features of the TOSHIBA 42DB833R device:
Installed matrix (LCD panel) LC420EUN (SD) (V1) 75023049.
The matrix control uses the Timing Controller (T-CON) 6870C-0368A.
To power the backlight used inverter 6917L-0061A.
The necessary supply voltages for all nodes of the TOSHIBA 42DB833R TV are generated by the PE-4151-01UN-LF power module or its analogs.
MainBoard - the main board (motherboard) is a 32AV833 module, using TS-SR29 75026421 BD MODULE 1737-001P0TB chips and others.
The TDTK-G641D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC420EUN-SDV1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 360 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
Trademark: TOSHIBA, Model: 42DB833.
Briefly from the TV: LCD, LED backlight, built-in DVD player, built-in Blu-ray player, 42 ", 1920x1080, 1080p Full HD, sound: 14W, HDMI: 2, Internet access.
The official Toshiba website has firmware (software update) for the models 42DB833N (1.57), 42DB833G (1.05), 42DB833F (1.57), 42DB833B (1.57).
The composition uses MainBoard 32AV833 Rev1.03 75026446 and an LCD panel (matrix) LC420EUN (SD) (V1).
Power Supply Unit (PSU) PE-4151-01UN-LF 75026434 (PE4101-01UN) Power Supply.
TOSHIBA 42DB833 LED TV with LC420EUN LCD, 42 "(107 cm) diagonal size in 16: 9 format. The required screen brightness of 360 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 1400: 1 Dynamic contrast ratio of 3,000,000: 1 is achieved by special control of the LEDs. This model uses side LED backlighting from Edge LEDs. The design and technical capabilities of the TV include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels it is in a graphic decomposition according to the standard 1080p (Full HD). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p Supported media file formats: MP3, MPEG4, Xvid, DivX, MKV, VideoCD, SVCD, JPEG.
The power of the speaker system of sound 14 W (2x7 W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, SCART, RGB, VGA, HDMI x2, USB x2, Ethernet (RJ-45). An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C standards.
The power consumed by the TV in the operating mode from the network is 87 watts.
Overall dimensions: with stand 1070x677x238 mm, without stand 1070x630x45 mm.
TV Weight: with stand: 15.5 kg, without stand: 14.5 kg.
Attention! The LC420EUN (SD) (V1) panel of the TOSHIBA 42DB833 LED TV is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.