Technical description and composition of the ERISSON 15LJ30 TV, type of panel and applicable modules. The composition of the modules.ERISSON
Model: 15LJ30
Chassis / Version: MST36-V1.2
Panel: LM156WH1
MainBoard: MST36-V1.2
IC MainBoard: SPI Flash: 25X40; EEPROM: 24C31;
Tuner: CDT-3FP2i2-01
Specifications 15LJ30
ERISSON 15LJ30
General recommendations for repairing TV LCD
Repair of the ERISSON TV with the MST36-V1.2 chassis should begin with a fault diagnosis, which involves a careful examination of the external and internal elements of the device. 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. If charred resistors, swollen electrolytic or cermet capacitors, ring cracks in the soldered terminals of transformers or heating elements are detected, it is advisable to establish the causes and consequences of the malfunction that has arisen, as well as to check the connected elements and assemblies.
If the 15LJ30 TV does not turn on, does not make any sounds when turned on, and also no indicators on the front panel light or blink - there is a high probability of a malfunction in the power module. In some cases, only the stabilizer or power converter of the control processor may be faulty, which is typical for some ERISSON models. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and the electrolytic capacitors of the filters of the converter secondary rectifiers. In the event of a fuse breaking, the reason should be sought in the power semiconductor elements of the pulse converter of the main power supply. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power switch (s) of the converter.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (IIP) it does not fail by itself without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, a PWM controller, which can only be checked replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
Sometimes the ERISSON 15LJ30 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 backlight converter, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all electrolytic capacitors of the filter according to the power supply of the inverter itself, including in the power supply unit (power supply unit). If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
In cases of attempts to repair the motherboard MST36-V1.2, it is necessary to check the operability of the stabilizers or power converters of its microcircuits and, if possible, update the software (software). BGA chips can in most cases be diagnosed by local heating. In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its SPI Flash chips: 25X40; EEPROM: 24C31; and other possible malfunctioning components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
It should be remembered! Attempts to repair the ERISSON 15LJ30 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
FIRMWARE FOR SPI FLASH -----------> ERISSON 15LJ30 , Main: MST36-V1.2, Panel: LM156WH1
The appearance of the MainBoard MST36-V1.2 is shown in the figure below:MST36-V1.2
MST36-V1.2 can be used in TVs:
ERISSON 24LJ10 (Panel V236H1-L01 ), ERISSON 15LJ30 (Panel LM156WH1), ERISSON 19LJ09 (Panel LM185WH1 (TL) (E6)), IZUMI TL15H102B (Panel M156NWR1), IZUMI TL19H213B (Panel LM185WH1 (TL)(FC)).
Main features of the ERISSON 15LJ30 device:
The matrix (LCD panel) LM156WH1 is installed.
The required supply voltage for all nodes of the TV ERISSON 15LJ30 provides a switching power supply.
MainBoard - the main board (motherboard) is an MST36-V1.2 module using SPI Flash chips: 25X40; EEPROM: 24C31; and others.
The tuner CDT-3FP2i2-01 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LM156WH1-TLE2
Type: a-Si TFT-LCD, Panel
Diagonal size: 15.6 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 344.232x193.536 mm
Brightness: 200 cd / m²
Contrast Ratio: 950: 1
Display Colors:, CIE1931 60%
Lamp Type: CCFL
Signal Interface: LVDS (1 ch, 8-bit)