Technical description and composition of the LG 19MN43D TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 19MN43D 19MN43D-PZ
Chassis / Version: LD02S
Panel: M185XTN01.3
LED driver (backlight): integrated into MainBoard
PWM LED driver: DT1641S
MOSFET LED driver: AOD478
Power Supply (PSU): Adapter 19V
MainBoard: EAX64875105 (1.0)
IC MainBoard: CPU: LGE2111A-T8, DRAM: H5TQ1G63FFR SPI: 25L8006E, NAND: H27U1G8F2B, EEPROM: ATMLH544 2EC (AT24C256C)
Tuner: TDSS-G101D
Specifications 19MN43D
LG 19MN43D
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 19MN43D TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
In such cases, the fault should be sought first in the Adapter power module.
This TV model is equipped with an external adapter type power supply, which the owner can purchase independently, and repairing it may not always be advisable, however, sometimes it makes sense to open it and eliminate simple typical defects typical of IPS. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches and rectifier diodes for a possible partial or complete breakdown.
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most 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, in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- 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.
Often in such cases, there is no LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the EAX64875105 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 cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - CPU: LGE2111A-T8, DRAM: H5TQ1G63FFR SPI: 25L8006E, NAND: H27U1G8F2B, EEPROM: ATMLH544 2EC (AT24C256C) 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).
If the TV works normally from external devices, but does not tune into television channels, the TDSS-G101D tuner may malfunction. 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 LG 19MN43D 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!
Service manual and schematic diagram ------------------------> LG 19MN43D Chassis LD02S
The appearance of the MainBoard EAX64875105 is shown in the figure below:EAX64875105
Main features of the device LG 19MN43D:
Installed matrix (LED-panel) M185XTN01.3.
To power the backlight LEDs, a converter is used, combined with the EAX64875105 main board, controlled by the DT1641S PWM controller. As the power elements of the LED driver, keys of the AOD478 type are used.
To power all the internal components of the LG 19MN43D TV, an external adapter 19V type source is used.
MainBoard - the main board (motherboard) is an EAX64875105 module, using CPU chips: LGE2111A-T8, DRAM: H5TQ1G63FFR SPI: 25L8006E, NAND: H27U1G8F2B, EEPROM: ATMLH544 2EC (AT24C256C) and others.
The TDSS-G101D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: M185XTN01.3
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: 700: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 3.6 / 1.4 (Tr / Td)
Frequency: 60Hz
Lamp Type: 7S4P WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V