Technical description and composition of the ERISSON 32LET41T2 TV, type of panel and applicable modules. The composition of the modules.ERISSON LED
Model: 32LET41T2
Chassis / Version: MT31BP
Panel: LVW320CS0T E274 V2
LED backlight: 32HR330M07A2 V2
T-CON: MT3151A05-5-XC-5
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP3398A
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6 RT7738F
MainBoard: 40-MT31BP-MAA2LG MIPE07R41 REV1.7
IC MainBoard: CPU: MT5531NDNT 1429-BCAH; SPI Flash: 25Q64F; SOUND: RT9108NB
Tuner: ST34WN-2T-E
Control: 40-32D270-KEB2LG J2150624SA466SK
Specifications 32LET41T2
ERISSON 32LET41T2
General repair guidelines for TV LCD LED
Possible manifestations of defects
- ERISSON 32LET41T2 does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
In such cases, the main power source - the AC / DC voltage converter, which is combined with the MainBoard 40-MT31BP-MAA2LG board, may turn out to be faulty. Then we recommend that you measure its output voltages and, if they are absent, you should check the health of the power switches and rectifier diodes of the converters for a probable short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) PWM SOT23-6 RT7738F, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
As a rule, in such cases there is no display backlight. The reason can be both in the power of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
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.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the 40-MT31BP-MAA2LG motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Board repair and replacement of CPU chips: MT5531NDNT 1429-BCAH; SPI Flash: 25Q64F; SOUND: MP3398A are manufactured with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
Before replacing the ST34WN-2T-E tuner, if there is no channel tuning, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
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 32LET41T2 device:
Installed matrix (LED-panel) LVW320CS0T E274 V2.
The matrix control uses the Timing Controller (T-CON) MT3151A05-5-XC-5.
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 RT7738F 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.
The ST34WN-2T-E tuner provides television reception and channel tuning.
Trademark: ERISSON, Model: 32LET41T2.
Briefly from the TV: LCD, 720p HD, 32 "(81 cm) diagonal, HDMI, USB, DVB-T2 support, backlight type: Edge LED.
The composition includes MainBoard 40-MT31BP-MAA2LG MIPE07R41 REV1.7 and LCD panel (matrix) LVW320CS0T E274 V2. The power supply is combined with the MainBoard.
Technical description
ERISSON 32LET41T2 TV with LVW320CS0T LCD, 32 "(81 cm) diagonal size of 16: 9 format. The required screen brightness of 240 cd / m² is provided by LED backlighting. Contrast ratio, as the ratio of maximum brightness to minimum, is 3000: 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 an analog system max PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i. Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
The power of the sound system 10 W (2x5 W) provides two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, S-Video, VGA, HDMI, 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, 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 1111x708x296 mm, Without a support 736x475x81 mm.
Attention! The LVW320CS0T E274 V2 panel of an ERISSON 32LET41T2 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.