Technical description and composition of the SITRONICS LCD-1502 TV, type of panel and applicable modules. The composition of the modules.Sitronics
Model: LCD-1502
Chassis / Version: E3703-001007-4
Panel: HSD150MX15-B
Inverter (backlight): BL02020-00A
Power Supply (PSU): LAD6019AB4 ADAPTER 12VDC 4A
MainBoard: E3703-001007-4
IC MainBoard: SAA5264PS / M3 / 0104 AIC1084-33CM MX88L284AEC AD9883A
Tuner: JS-6B2 / 121
Appearance
SITRONICS LCD-1502
General repair guidelines for TV LCD
TV Sitronics LCD-1502, like any other, it is advisable to start repairing by examining the internal and external visible physical visual changes. Many visible signs make it possible to determine the future direction of troubleshooting and localization of the defect. Electrolytic capacitors of filters with a swollen body, as well as ring cracks or a layer of coal on burned-out resistors formed in soldered terminals of heating elements, sometimes tell the repairman the causes of the malfunction and possible consequences.
If the power supply module malfunctions, external manifestations may be different, for example, the Sitronics LCD-1502 does not turn on at all and there is no indication of the control lights on the front panel. When diagnosing and repairing the power supply, first of all, it is necessary to 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 or power key.
If a breakdown of the power switch of the flyback converter of the power supply unit is detected, it should be remembered that it does not fail for no reason, which should be sought by checking other elements of the primary circuit - electrolytic capacitors, a PWM controller that can only be checked by replacement, as well as others semiconductor elements (diodes, transistors, zener diodes).
In cases where the Power Factor Corrector (PFC) is used in the power supply, troubleshooting can be a bit more complicated.
If the Sitronics LCD-1502 does not have an image, but there is sound, there is a possibility of a malfunction of the backlight or power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
Diagnostics and repair of the inverter are often complicated by the organization of special protection circuits, which is necessary for fire safety and turns off the inverter in any emergency situation, for example, when the lamps are worn or depressurized. Often, to localize a defect, its blocking is required.
Turning off the protection for diagnostic purposes, it must be remembered that in this case there is a risk of failure of the power elements of the inverter. Upon completion of the diagnosis, all regular protection circuits should be restored.
If the motherboard E3703-001007-4 is faulty, first of all it is necessary to check all the linear power regulators of its chips and, if necessary, update the software. Sometimes you can check the health of MB only by replacement. In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - SAA5264PS / M3 / 0104 AIC1084-33CM MX88L284AEC AD9883A with new or obviously working ones.
Attention to the owners! Attempts at self-repairing the Sitronics LCD-1502 TV are not recommended by the manufacturer and can lead to serious negative consequences!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Sitronics LCD-1502
Main technical specifications:
TFT technology, Diagonal 15-inch, 1024 x 768, 4: 3, Response time 16 ms, Brightness 500 cd / m, Dynamic contrast 500: 1: 1, Grain size 0.297 mm, Viewing angle 160 °
Main features of the SITRONICS LCD-1502 device:
Installed matrix (LCD panel) HSD150MX15-B.
To power the backlight used inverter BL02020-00A.
The formation of the necessary supply voltages for all nodes of the SITRONICS LCD-1502 TV is carried out by the power module LAD6019AB4, or its analogs.
MainBoard - the main board (motherboard) is an E3703-001007-4 module, using SAA5264PS / M3 / 0104 AIC1084-33CM MX88L284AEC AD9883A chips and others.
The JS-6B2 / 121 tuner provides TV reception and channel tuning.