Technical description and composition of the ERISSON 19LJ09 TV, type of panel and applicable modules. The composition of the modules.ERISSON
Model: 19LJ09
Chassis / Version: MST36-V1.2
Panel: LM185WH1 (TL) (E6)
Inverter (backlight): integrated into PSU
PWM Inverter: TL494
MOSFET Inverter: AO4828
Power Supply (PSU): LS1502067
PWM Power: LD7575D
MOSFET Power: 4N60C
MainBoard: MST36-V1.2
IC MainBoard: SPI Flash: Winb25X40; EEPROM: (U9) - FT24C32, (U11) - 24C02; SOUND: TDA1517P;
Tuner: CDT-3F212-01
Specifications 19LJ09
ERISSON 19LJ09
General recommendations for repairing TV LCD
Possible malfunctions
- The ERISSON 19LJ09 TV does not turn on and does not show any signs of operability at all. There is no reaction to either the remote control or the front panel control buttons.
In such cases, the fault should be sought first in the LS1502067 power module. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is first necessary to check the power switches (4N60C) and rectifier diodes for a possible partial or complete breakdown.
In case of avalanche and thermal breakdowns of diodes in the secondary circuits, the converter can operate in emergency short circuit mode, and in case of short circuit in the power elements of the primary circuit, a mains fuse or a current sensor at the source of the key usually breaks.
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. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power key may be PWM (PWM) LD7575D. It is checked only by replacement with a known good one.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
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.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the MST36-V1.2 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). In some cases, chip repair may be required to repair the MB (SSB) board - SPI Flash: Winb25X40; EEPROM: (U9) - FT24C32, (U11) - 24C02; SOUND: TDA1517P; to new or obviously serviceable. In cases where BGA technologies are used, defects are usually localized by the heating method.
If the TV works normally from external devices, but does not tune into television channels, the tuner CDT-3F212-01 may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Owners and users of the ERISSON 19LJ09 TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
FIRMWARE FOR SPI FLASH -----------> ERISSON 19LJ09 , Main: MST36-V1.2, Panel: LM185WH1 (TL) (E6)
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)).
The appearance of the power supply
Main features of the ERISSON 19LJ09 device:
The matrix (LCD panel) LM185WH1 (TL) (E6) is installed.
To power the backlight, a converter is used, combined with a power supply, controlled by a TL494 PWM controller. As power elements of the inverter, keys of the type AO4828 are used.
The required supply voltages for all nodes of the TV ERISSON 19LJ09 are generated by the LS1502067 power module or its analogs using LD7575D microcircuits and 4N60C type power switches.
MainBoard - the main board (motherboard) is an MST36-V1.2 module using SPI Flash chips: Winb25X40; EEPROM: (U9) - FT24C32, (U11) - 24C02; SOUND: TDA1517P; and others.
The tuner CDT-3F212-01 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LM185WH1-TLE6
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 200 cd / m²
Contrast Ratio: 600: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 60%
Response Time: 5 (Tr + Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V