Technical description and composition of the ERISSON 32LET40 TV, panel type and applicable modules. The composition of the modules.ERISSON LED
Model: 32LET40
Chassis / Version: MT31LB
Panel: LVW320CSOT E45 V11 T8-32T3510-LPM8
T-CON: MT3151A04-1-XC-9
LED driver (backlight): integrated into PSU
PWM LED driver: MP3394S
MOSFET LED driver: APM1105N
Power Supply (PSU): SHG3203B-101H DLBB253 REV: 9.1
PWM Power: OB5269CP, MC34063AL
MOSFET Power: 6N60
MainBoard: 40-T31TOT-MAB2HG MT31LB
IC MainBoard: Spi Flash: 25Q64F
Tuner: RF221ZN V4D17AA
Specifications 32LET40
ERISSON 32LET40
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The ERISSON 32LET40 TV does not turn on and does not show any signs of turning on, does not respond to the control buttons or to the remote control.
Failure in such cases should begin to be sought in the power supply circuits of SHG3203B-101H. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (6N60) and rectifier diodes for a possible partial or complete breakdown.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers OB5269CP, MC34063AL, in the absence of visible damage or frank fault between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
The most likely in these cases is a malfunction of the LED backlight. Often the cause of the malfunction is the lack of current in the LED circuit, for example, an open or short circuit, or a violation of the contact connections of the connectors.
To check the LED strips, to open all the transitions of the LEDs, several tens of volts or more are needed, it is best to use a current source for such purposes. The breakage of several PN junctions connected in series cannot be detected with a multimeter or tester. In such cases, it is necessary to open the panel and check each LED. If your multimeter cannot open the LED transitions in forward bias, you can sometimes detect the presence of a PN junction of the protective zener diode by connecting the probes in the opposite direction. If the zener diode is broken or broken in short-circuit, then the LED is faulty and needs to be replaced.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the 40-T31TOT-MAB2HG 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). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - Spi Flash: 25Q64F and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
If there is no reception of television channels, but the TV is working properly from external devices, first of all you need to check the voltage of the tuner RF221ZN V4D17AA and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
For 32LET40 TV owners, we recommend that you contact qualified personnel with the necessary work experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
FIRMWARE FOR SPI FLASH -----------> ERISSON 32LET40, Main: 40-T31TOT-MAB2HG MT31LB, Panel: LVW320 CSOT E45 V11; T8-32T3510-LPM8
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> SHG3203B-101H Power supply
To reduce the backlight current in LED drivers with the MP3394S (MP3394) controller, increase the resistance of the resistor from pin 6 (ISET) to the chassis. The maximum current in each channel (in milliamperes) for the Rset resistor (in kilo-ohms) is determined from the ratio 790 * 1.23V / (Rset + 0.4).
The appearance of the MainBoard 40-T31TOT-MAB2HG is shown in the figure below:
40-T31TOT-MAB2HG
40-T31TOT-MAB2HG can be used in TVs:
ERISSON 32LET40 (Panel LVW320CSOT E45 V11 T8-32T3510-LPM8), ERISSON 28LET40 (Panel LVW280CSOT E19 V2), FUSION FLTV-24T25 (Panel LVW240CMOT E12 V6), MYSTERY MTV-3227LT2 (Panel LVW320CSOT E45 V11 720p HD 1366x768), MYSTERY MTV-4225LT2 (Panel LVF420CMOT - E18.V1), SUPRA STV-LC32T662WL (Panel LWV320CSOT E45 V16 (T8-32T3520-LPM10)).
The appearance of the power supply
Main features of the ERISSON 32LET40 device:
Installed matrix (LED panel) LVW320CSOT E45 V11 T8-32T3510-LPM8.
The matrix control uses the Timing Controller (T-CON) MT3151A04-1-XC-9.
To power the backlight LEDs, a converter is used, combined with the power supply, controlled by the MP3394S PWM controller. As the power elements of the LED driver, keys of the APM1105N type are used.
The necessary supply voltages for all nodes of the ERISSON 32LET40 TV are generated by the SHG3203B-101H power supply module or its analogs using OB5269CP, MC34063AL chips and 6N60 type power switches.
MainBoard - the main board (motherboard) is a 40-T31TOT-MAB2HG module, using Spi Flash chips: 25Q64F and others.
The tuner RF221ZN V4D17AA provides the reception of television programs and tuning to channels.
Trademark: ERISSON, Model: 32LET40.
Shortly from the TV: LCD, 720p HD, 32 "(81 cm) diagonal, TFT TN, HDMI connectors: 2, there is support for DVB-T2, backlight type: Edge LED.
The composition includes MainBoard 40-T31TOT-MAB2HG MT31LB and LCD panel (matrix) LVW320CSOT E45 V11, T8-32T3510-LPM8.
Technical description
ERISSON 32LET40 TV with LVW320CSOT LCD display, 32 "(81 cm) diagonal size in 16: 9 format. The required screen brightness of 280 cd / m² is provided by LED backlighting. 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 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, component, VGA, HDMI x2, MHL.
A digital tuner is capable of receiving television channels in the DVB-T, DVB-T2 standards.
Overall dimensions: With stand 732x492x190 mm, Without stand 732x442x59 mm.
Attention! The LVW320CSOT E45 V11, T8-32T3510-LPM8 panel of an ERISSON 32LET40 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.