Technical description and composition of the ERISSON 32LT12 TV, type of panel and applicable modules. The composition of the modules.ERISSON
Model: 32LT12
Chassis / Version: 40-MT8223-MAH2XG
Panel: LTA320AP07
MainBoard: 40-MT8223-MAH2XG
IC MainBoard: CPU MT8223LFMU, Flash W25Q16BVSIG
Tuner: 07-380FI5-NFHG
Specifications 32LT12
ERISSON 32LT12
General recommendations for repairing TV LCD
Repair of all electronic devices, including the ERISSON TV, made on the basis of the 40-MT8223-MAH2XG chassis, 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. 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.
Malfunctions of the power module can be expressed in different ways, for example, ERISSON 32LT12 does not turn on at all and the control lamps on its front panel do not light up and do not blink, 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.
Power switches in pulsed power supplies (SMPS) fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The cause may be a malfunction of the PWM controller chip, which can only be checked by replacing it with a new or obviously working one.
If the ERISSON 32LT12 does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction of the display backlight, or their power converter - inverter. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the inverter itself, including in the secondary rectifier of the main PSU. When diagnosing a malfunction of the inverter with the protection off, special precautions must be taken, because there is a risk of failure of the power elements of the inverter. After the diagnosis, it is imperative to restore the protection circuits for the inverter to operate normally.
If the 40-MT8223-MAH2XG motherboard is faulty, first of all it is necessary to check all the linear stabilizers or power converters of its chips, and also, if necessary, update the software. Sometimes you can check the health of MB only by replacement. In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - CPU MT8223LFMU, Flash W25Q16BVSIG 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).
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
FIRMWARE FOR SPI FLASH -----------> ERISSON 32LT12, Main: 40-MT8223-MAH2XG, Panel: LTA320AP07
The appearance of the MainBoard 40-MT8223-MAH2XG is shown in the figure below:40-MT8223-MAH2XG
40-MT8223-MAH2XG can be used in TVs:
ERISSON 32LT12 (Panel LTA320AP07), ERISSON 24LT12 (Panel V236H1-L01 Rev.C3 ).
Main features of the ERISSON 32LT12 device:
Installed matrix (LCD panel) LTA320AP07.
The required supply voltage for all nodes of the TV ERISSON 32LT12 provides a switching power supply.
MainBoard - the main board (motherboard) is a 40-MT8223-MAH2XG module, using MT8223LFMU CPU chips, Flash W25Q16BVSIG and others.
The tuner 07-380FI5-NFHG provides television reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA320AP07
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Active Area: 697.68x392.26 mm
Lamp Type: 4 pcs CCFL
Signal Interface: LVDS (1 ch, 8-bit)