Technical description and composition of the TOSHIBA 42HL833R TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 42HL833R
Chassis / Version: 32AV833
Panel: LC420EUN (SD) (V1) LED 75023049
LED backlight: 3660L-0374A 201 42 V6 Edge FHD-3 Rev1.0 L-Type / R-Type
T-CON: V8 32/42/47 FHD TM120HZ 6870C-0368A Ver V0.6
LED driver (backlight): PCLF-D002A Rev1.1 6917L-0061A
PWM LED driver: BD9262EFV (28)
MOSFET LED driver: AO D482,
Trans LED driver: .330A inductors 4 pcs
Power Supply (PSU): DPS-135JP B / A DELTA 75025645 POWER OPENFRAME, 140W / + 5 12 24V, 0433-005U000, analogue RE-3141-01UN-LF
PWM Power: DDA010 (Standby), DDA014 (18), NCP1608 (PFC)
MOSFET Power: K10A60DR,
MainBoard: 32AV833 Rev 1.03 75025658
IC MainBoard: MSD3704PX-LF-SA, TAS5707L, TI17J,
Tuner: TDTK-G641D 9C-EB40M0050
Control: CT-90326 75014827
Specifications 42HL833
TOSHIBA 42HL833R
General repair guidelines for TV LCD LED
Repair of all electronic devices, including the TOSHIBA 42HL833R TV, it is advisable to start with an external examination of its external and internal elements. Often, by the external signs and nature of the damage to the elements, it becomes possible to draw some conclusions and determine a further algorithm for finding a defect before making the necessary measurements at control points. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
If the power supply module DPS-135JP B / A DELTA 75025645 POWER OPENFRAME, 140W / + 5 12 24V, 0433-005U000, analogue of PE-3141-01UN-LF malfunctions, external manifestations may be different, for example, the TOSHIBA 42HL833R does not turn on at all no indication of indicator lights on the front panel. With the same symptoms, the stabilizer (converter) of the power supply to the control processor may be faulty. In the general case, first of all, it is necessary to check the electrolytic capacitors of the secondary rectifier filters and the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Options are K10A60DR,.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the binding of the PWM controller microcircuit DDA010 (8), DDA014 (18), NCP1608 (8), which it is desirable to check by replacement, are subject to verification.
If the TOSHIBA 42HL833R TV does not have an image, but there is sound, a malfunction in the LED backlight circuits of the LC420EUN (SD) (V1) LED 75023049 panel is likely. It is also necessary to check the operability of the electrolytic capacitors of the filter of the secondary rectifiers of the BP (power supply) for an overestimated ESR.
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
On the motherboard 32AV833 Rev 1.03 75025658, in case of a malfunction, you should first check the performance of all the stabilizers or power converters of the microcircuits and, if necessary, update the software (software).
When repairing an MB board, you need to check its components MSD3704PX-LF-SA, TAS5707L, TI17J,. Defective items should be replaced. If BGA chips are installed, their malfunction is usually localized by heating. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
If a TDTK-G641D 9C-EB40M0050 tuner is suspected of malfunction, first of all, it is necessary to make sure that the voltage of the varicaps (30-33V) is present at the corresponding terminal of the tuner, as well as other voltage supplying it.
Attention to the owners! Attempts to self-repair the TOSHIBA 42HL833R TV are not recommended by the manufacturer and can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Toshiba Chassis 32AV833. Service manual and schematic diagram
To reduce the backlight current in LED drivers with the BD9262EFV controller, the total resistance of the resistors from terminal 23 (ISET) to the housing should be proportionally increased.
Repair MainBoard
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)).
PSU Advanced
The 42HL833R TV is equipped with a DPS-135JP power module using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the NCP1608 PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes when the charge current determines its reactance (of the order of 15-30 ohms at a frequency of 50 Hz). As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
The appearance of the power supply
Key Features of the TOSHIBA 42HL833R:
Installed matrix (LED-panel) LC420EUN (SD) (V1) LED 75023049.
The matrix control uses the Timing Controller (T-CON) V8.
The LED driver PCLF-D002A is used to power the backlight LEDs, it is controlled by the BD9262EFV PWM controller (28). A transformer .330A inductors of 4 pcs is installed in the converter of the LED driver. As the power elements of the LED driver, keys of the type AO D482, are used.
The necessary supply voltages for all nodes of the TOSHIBA 42HL833R TV are generated by the DPS-135JP power supply module or its analogs using DDA010 (Standby), DDA014 (18), NCP1608 (PFC) microcircuits and K10A60DR type power switches,.
MainBoard - the main board (motherboard) is a 32AV833 module, using microchips MSD3704PX-LF-SA, TAS5707L, TI17J, and others.
Tuner TDTK-G641D 9C-EB40M0050 provides the reception of television programs and tuning to channels.
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: 42HL833.
Shortly from the TV: LCD, LED backlight, 42 ", 1920x1080, 1080p Full HD, sound: 14W, HDMI connectors: 2.
The official Toshiba website has firmware (software update) for the models 42HL833N (1.57), 42HL833G (1.05), 42HL833F (1.57), 42HL833B (1.57).
The composition uses MainBoard 32AV833 Rev 1.03 75025658 and an LCD panel (matrix) LC420EUN (SD) (V1).
Power supply unit (PSU) DPS-135JP B / A DELTA 75025645 140W 12.24V (analogue RE-3141-01UN-LF).
TOSHIBA 42HL833 LED TV with LC420EUN LCD display, 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 operation.This model uses side illumination from Edge LEDs.The design and technical capabilities of the TV include watching 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, MKV, 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. 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, 1280x1024, 1360x768, 1920x1080.
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 141 watts.
Overall dimensions: with stand 1070x677x238 mm, without stand 1070x630x45 mm.
TV Weight: with stand: 15 kg, without stand: 13.98 kg.
Attention! The LC420EUN (SD) (V1) panel of the TOSHIBA 42HL833 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.