Technical description and composition of the LG M2341A TV, panel type and applicable modules. The composition of the modules.LG LED
Model: M2341A M2341AN
Chassis / Version: LD93H
Panel: LM230WF1 (TL) (E3)
MainBoard: LGM2241A
IC MainBoard: CPU: MT8223LFMU, Spi Flash: 25L3206E, EEPROM: ATMLH138
Tuner: TDTC-G451D EBL60840001
Appearance
LG M2341A
General repair guidelines for TV LCD LED
Repair of electronic equipment usually begins with its external inspection and diagnosis of the malfunction. In this case, you should examine all the internal components of the LG M2341AN TV, as well as the external elements of the housing. Based on visible external changes in the state of the components, it is usually possible to determine the further direction of troubleshooting and localization of the defect before making the necessary measurements. 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.
In case of a power supply module malfunction, external manifestations may be different, for example, LG M2341AN does not turn on at all and there is no indication of control lights on the front panel. With the same symptoms, the stabilizer (converter) of the power supply to the control processor may be faulty. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
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).
If, when you turn on the TV, the image appears and immediately disappears, or is missing initially when you turn on, but the sound has other functions that work, there is a high probability of a malfunction of the LED driver (power converter for the backlight LEDs of the panel LM230WF1 (TL) (E3)). In such cases, the common power module is also subject to verification, in which the electrolytic capacitors of the rectifier filter supplying the LED driver should be checked.
In most cases of lack of backlight, it becomes necessary to disassemble the panel in order to check the LEDs, connectors, loops and all contact connections. If one or several LEDs does not work in one line, therefore, they are broken and should be replaced.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source.
Repair of the motherboard LGM2241A must begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - CPU: MT8223LFMU, Spi Flash: 25L3206E, EEPROM: ATMLH138 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 you suspect a malfunction of the TDTC-G451D EBL60840001 tuner, first of all, make sure that there is a supply voltage on the corresponding output of the tuner.
Attention! Users and owners of M2341AN TVs who do not have the appropriate qualifications, knowledge and experience are strongly advised against self-repair attempts in order to avoid negative consequences that could lead to complete non-repairability of the device.
Service manual / schematic diagram -------------> LG CHASSIS: LD93H; M2241A M2241A-PTN SERVICE MANUAL
Main features of the device LG M2341A:Installed matrix (LED-panel) LM230WF1 (TL) (E3).
The required supply voltage for all nodes of the TV LG M2341A provides a switching power supply.
MainBoard - the main board (motherboard) is an LGM2241A module using CPU chips: MT8223LFMU, Spi Flash: 25L3206E, EEPROM: ATMLH138 and others.
The TDTC-G451D EBL60840001 tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LM230WF1-TLE3
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.0 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 509.184x286.416 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC)
Response Time: 1.3 / 3.7 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
