Technical description and composition of the ERISSON 32LET82 TV, panel type and applicable modules. The composition of the modules.ERISSON LED
Model: 32LET82
Chassis / Version: 40-MT31BP-MAA2LG
Panel: LVW320CSOT E145 V2
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP3398A
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6 (RT7738)
MainBoard: 40-MT31BP-MAA2LG
IC MainBoard: CPU: MT5531NDNT 1429-BCAH; SPI Flash: 25Q64F; SOUND: RT9108NB
Tuner: 07-600C13-SA2G ST34WN-2T-E
Specifications 32LET82
ERISSON 32LET82
General repair guidelines for TV LCD LED
Repair of electronic devices, including the ERISSON 32LET82 TV, it is advisable to start with an external examination of its external and internal elements. Sometimes, based on visible changes in the components of the device, it is possible to draw some conclusions and determine the direction of further troubleshooting even before the necessary measurements are taken. 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.
Sometimes the ERISSON 32LET82 TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is a failure of the common power module. If it is working properly, you need to check the processor batteries on the SSB (Main Board). First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is cut off in the power supply, in most cases a breakdown of the power key (s) is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
It should be remembered that in the practice of repair, usually the power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
Sometimes the ERISSON 32LET82 TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the converter for the backlight LEDs of the LVW320CSOT E145 V2 panel, or a break in the LED circuit is possible. In such cases, first of all, it is necessary to verify the serviceability of all the electrolytic capacitors of the filter by supplying the LED driver itself, including in the power supply unit (power supply unit).
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 diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source.
On the 40-MT31BP-MAA2LG motherboard, in case of a malfunction, you should first check the performance of all stabilizers or power converters of the microcircuits and, if necessary, update the software (software).
In cases of attempts to repair the MB board (SSB), you need to check the health of its elements - SPI Flash: 25Q64F which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
If there is no reception of television channels, but the TV works properly from external devices, first of all, check the voltage of the tuner 07-600C13-SA2G ST34WN-2T-E.
Attention to the owners! Attempts to repair the TV ERISSON 32LET82 on its own are not recommended by the manufacturer and can lead to serious negative consequences!
FIRMWARE FOR SPI FLASH -----------> ERISSON 32LET82, Main: 40-MT31BP-MAA2LG, Panel: LVW320CSOT E145 V2
The appearance of the MainBoard 40-MT31BP-MAA2LG is shown in the figure below:40-MT31BP-MAA2LG
40-MT31BP-MAA2LG can be used in TVs:
ERISSON 32LET82 (Panel LVW320CSOT E145 V2), ERISSON 32LET42T2 (Panel LVW320CSOT E274 V2), ERISSON 32LET41T2 (Panel LVW320CS0T E274 V2), FUSION FLTV-32T21 (Panel LVW320CZOT), SUPRA STV-LC32T420WL (Panel LVW320CSOT E155 V2), SUPRA STV-LC32T850WL (Panel LVW320CSOT E45 V1), SUPRA STV-LC28T662WL (Panel T8-28T3520-LPM20), SUPRA STV-LC24T850WL (Panel 720p HD 1366x768), TELEFUNKEN TF-LED32S29T2 (Panel LVW320CS0T E198 V4), TELEFUNKEN TF-LED24S29T2 (Panel V236BJ1-LE2 Rev.C1), THOMSON T24E12DHU-01B T24E12DHU (Panel LVW240AUDX E2 V6).
Main features of the ERISSON 32LET82 device:
Installed matrix (LED-panel) LVW320CSOT E145 V2.
To power the backlight LEDs, a converter is used, combined with the main board 40-MT31BP-MAA2LG, controlled by the MP3398A PWM controller.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using PWM SOT23-6 (RT7738) microcircuits.
MainBoard - the main board (motherboard) is a 40-MT31BP-MAA2LG module using CPU chips: MT5531NDNT 1429-BCAH; SPI Flash: 25Q64F; SOUND: RT9108NB and others.
Tuner 07-600C13-SA2G ST34WN-2T-E provides the reception of television programs and tuning to channels.
Trademark: ERISSON, Model: 32LET82.
Shortly from the TV: LCD, 720p HD, 32 "(81 cm) diagonal, TFT TN, HDMI connectors: 2, there is USB, there is support for DVB-T2, backlight type: Edge LED.
The composition uses MainBoard 40-MT31BP-MAA2LG and an LCD panel (matrix) LVW320CSOT E145 V2. The power supply is combined with the MainBoard.
TV ERISSON 32LET82 with LCD display LVW320CSOT, diagonal size 32 "(81 cm) in 16: 9 format. The required brightness of the screen is 250 cd / m² LED backlight LED. Contrast, as the ratio of maximum brightness to minimum, is 4000: 1. The LED panel of this TV is equipped with an end LED backlight - Edge LED. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems Ax PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i. 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, 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 732x438x58 mm.
Attention! The LVW320CSOT E145 V2 panel of an ERISSON 32LET82 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.