Technical description and composition of the TOSHIBA 42RL833R TV, type of panel and applicable modules. The composition of the modules.TOSHIBA LED
Model: 42RL833R
Panel: LC420EUN-SDV1 75023049
LED backlight: 3660L-0374A 201 42 V6 Edge FHD-3 Rev1.0 L-Type / R-Type
Power Supply (PSU): PA-3201-01TS-LF 75022759
MainBoard: PE0957 A RL833 75023053
Tuner: ENGS7305D5F 75022851
Control: CT-90345 75018168
Specifications 42RL833
TOSHIBA 42RL833R
General repair guidelines for TV LCD LED
Repair of all electronic devices, including the TOSHIBA 42RL833R TV, it is advisable to start with an external examination of its external and internal elements. Specific external damage to some elements can sometimes indicate further actions to determine the malfunction of the TV and localize the defect before the necessary measurements are taken. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
Malfunctions of the PA-3201-01TS-LF 75022759 power supply module can be expressed in different ways, for example, the TOSHIBA 42RL833R does not turn on at all and the control lights on its front panel do not light up and do not blink, and there are no signs of operability. It should be noted that with the same external manifestations, the processor power regulator (converter) may be faulty. When diagnosing and repairing the power supply, first of all, replace the swollen capacitors of the filter of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and transistors in the primary circuit.
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 strapping of the PWM controller chip are subject to verification, which it is desirable to verify by replacement.
If the TOSHIBA 42RL833R TV does not have an image, but there is sound, a malfunction in the LED backlight circuits of the LC420EUN-SDV1 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 power supply unit (power supply unit) for excessive ESR.
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required.
The motherboard PE0957A, MAIN (FOR SERVICE), RL833 75023053 must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up constantly. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary.
If the TV works normally from external devices, but does not tune into television channels, the tuner ENGS7305D5F 75022851 may be malfunctioning. In such cases, you should first make sure that there are power supply voltages on its respective terminals, as well as varicap power supply (30-33V).
Remember! Attempts to self-repair by users of the TOSHIBA 42RL833R TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
Repair MainBoard
The appearance of MainBoard PE0957 is shown in the figure below:
PE0957
PE0957 can be used in TVs:
TOSHIBA 42RL833R (Panel LC420EUN-SDV1 75023049), TOSHIBA 37RL833R (Panel LC370EUN (SD)(V1)).
The appearance of the power supply
Key Features of the TOSHIBA 42RL833R:
Installed matrix (LED-panel) LC420EUN-SDV1 75023049.
The necessary supply voltages for all nodes of the TOSHIBA 42RL833R TV are generated by the PA-3201-01TS-LF power module or its analogs.
MainBoard - the main board (motherboard) is a PE0957 module.
The tuner ENGS7305D5F 75022851 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: 42RL833.
Briefly from the TV: LCD, LED backlight, 42 ", 1920x1080, 1080p Full HD, sound: 20W, HDMI: 4, Internet access, Smart TV.
On the official Toshiba website there are firmware (software updates) for the models 42RL833R (17.8.37.1), 42RL833G (17.8.37.1).
The composition uses MainBoard PE0957 A 75023053 and an LCD panel (matrix) LC420EUN-SDV1.
Power Supply Unit (PSU) PA-3201-01TS-LF 75022759 Power Supply.
TOSHIBA 42RL833 LED TV with LC420EUN-SDV1 LCD display, 42 "(107 cm) diagonal size in 16: 9 format. The required brightness of the 360 cd / m² screen 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 peak firs graphically expansion by standard 1080p (Full HD).
The 42RL833 is equipped with SMART software, integrated applications and the ability to work on the Internet. Connecting to the Internet can be done via Wi-Fi. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, MPEG4, JPEG.
The power of the sound system 20 W (2x10 W) provides 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 x3, component, SCART, RGB, VGA, HDMI x4, USB, 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, 1280x1024, 1360x768.
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 96 watts.
Overall dimensions: with stand 1007x678x216 mm, without stand 1007x621x41 mm.
TV Weight: with stand: 14 kg, without stand: 12.6 kg.
Attention! The LC420EUN-SDV1 panel of the TOSHIBA 42RL833 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.