Technical description and composition of the ERISSON 40LET82 TV, type of panel and applicable modules. The composition of the modules.ERISSON LED
Model: 40LET82
Chassis / Version: MT31LB
Panel: 1080p Full HD, 1920x1080
Mainboard: MT31LB
IC MainBoard: Flash GD25Q64
Tuner: RF221ZN V4D17AA
Specifications 40LET82
ERISSON 40LET82
General repair guidelines for TV LCD LED
Repair of TVs, as well as other devices, it is advisable to start with an external examination. According to some external signs of a change in the state of some elements, it is sometimes possible to make assumptions about the nature of the defect, as well as determine the further direction of the troubleshooting. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
In case of a power supply module malfunction, external manifestations may be different, for example, ERISSON 40LET82 does not turn on at all and there is no indication of control 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. Possible options.
In most cases, key breakdowns in switching power supplies (SMPS) do not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can 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 defective PWM chip from the manufacturer.
In cases where the ERISSON 40LET82 TV has lost the image, and the sound is there and all the other functions are functional, there is a possibility of a malfunction of the LED driver (converter for powering the backlight LEDs of the panel 1080p Full HD, 1920x1080). When you turn on the TV, the image may appear briefly and disappear immediately. It must be borne in mind that with such manifestations the LEDs themselves also fail.
In most cases of lack of backlight, it becomes necessary to disassemble the panel in order to check the LEDs, connectors, loops and all contact connections. If one or several LEDs does not work in one line, therefore, they are broken and should be replaced.
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
In the event of a malfunction, on the MT31LB motherboard, first of all, check the operability of all stabilizers or power converters of the microcircuits and, if necessary, update the software (software).
In some cases, they require checking or replacing (if necessary) the elements of the MB board (SSB) - Flash GD25Q64. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the tuner RF221ZN V4D17AA.
Attention to users! Self-repair of the ERISSON 40LET82 TV without the appropriate qualifications and experience can lead to its complete non-repairability!
FIRMWARE FOR SPI FLASH -----------> ERISSON 40LET82 , Main: MT31BL, Panel: 1080p Full HD, 1920x1080
The appearance of the MainBoard MT31LB is shown in the figure below:MT31LB
Main features of the ERISSON 40LET82 device:
Installed matrix (LED-panel) 1080p Full HD, 1920x1080.
The required supply voltage for all nodes of the TV ERISSON 40LET82 provides a switching power supply.
MainBoard - the main board (motherboard) is an MT31LB module, using Flash GD25Q64 chips and others.
The tuner RF221ZN V4D17AA provides the reception of television programs and tuning to channels.
ERISSON 40LET82 TV with a 1080p LCD display, 40 "(102 cm) diagonal size in 16: 9 format. The required screen brightness of 270 cd / m² is provided by LED backlighting. Contrast, as the ratio of maximum brightness to minimum, is 5000: 1. The LED panel of this TV uses end LED backlighting - Edge LED.The TV's design and technical features include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphic resolution of 1080p (Full HD) standard. The video or video signal can be processed in analogue 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, DivX, MKV , JPEG.
The power of the sound system 10 W (2x5 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, component, VGA, HDMI x2, MHL, USB. 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, DVB-T2 standards.
Overall dimensions: With a support 897x597x230 mm, Without a support 913x529x80 mm.
Attention! The 1080p Full HD, 1920x1080 panel of an ERISSON 40LET82 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 LCD 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.