Technical description and composition of the LG 42LN541V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 42LN541V
Chassis / Version: LD31B / LC31B / LL36B
Panel: LC420DUE (SF) (R1)
LED backlight: Led 42 ROW2.1 Rev 0.6 6916L-1214A, 6916L-1215A, 6916L-1216A, 6916L-1217A
T-CON: LC500DUE-SFR1 Control_Merge
LED driver (backlight): integrated into PSU; 157V 341mA
PWM LED driver: MAP3202
MOSFET LED driver: FDT86106, STF10NM60N
Power Supply (PSU): EAX64905301 (2.3) LGP42-13PL1
PWM Power: SSC1S311A (PWM flyback), NR891D (PWM Step-down 24/12)
MOSFET Power: MDF11N65B
MainBoard: EAX64891306 (1.1)
IC MainBoard: CPU: LGE2121-MS; DRAM: H5TQ2G630FR; NAND Flash: SAA36254746F VER 03.13.72; SPI Flash: 25Q80; SOUND: STA3808WF;
Tuner: TDSQ-G601D (B)
Control: IR: EBR75421804
Specifications 42LN541V
LG 42LN541V
General repair guidelines for TV LCD LED
Repair of TVs, as well as other devices, it is advisable to start with an external examination. 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. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
If the EAX64905301 (2.3) LGP42-13PL1 power supply module fails, the external manifestations may be different, for example, LG 42LN541V does not turn on at all and there is no indication of the indicator lights on the front panel. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is broken in the power supply, in most cases a breakdown of the power key (s) is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
In most cases, key breakdowns in switching power supplies (SMPS) do not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective chip PWM SC1S311, NR891D from the manufacturer.
If the LG 42LN541V does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction in the backlight LED circuit of the LC420DUE (SF) (R1) panel, or their power converter - LED driver. Sometimes, when turned on, the image appears and immediately disappears. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the LED driver itself, including in the secondary rectifier of the main PSU.
A malfunction in the backlight circuits often occurs due to an open in the power circuit of the LED lines. It requires disassembling the panel and checking the LEDs themselves, the rations of their terminals, as well as the reliability of the connections in the connectors and rations of the terminals.
It is impossible to check the line of series-connected LEDs without a special current source, and for this purpose it is not safe to use any voltage sources above 12V for them. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up one LED slightly if you connect the probes in the forward direction, the red probe to the anode, and the black to the cathode.
On the EAX64891306 (1.1) motherboard, in case of a malfunction, you should first check the performance of all the stabilizers and power converters of the microcircuits, and also, if necessary, update the software (software).
Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the CPU elements: LGE2121-MS; DRAM: H5TQ2G630FR; NAND Flash: SAA36254746F VER 03.13.72; SPI Flash: 25Q80; SOUND: STA3808WF; . BGA chip malfunctions are usually easy to detect by warming up.
The failure of the TDSQ-G601D (B) tuner is established after checking the software and all supply voltages at its terminals.
Attention to the owners! Attempts to repair the LG 42LN541V TV independently are not recommended by the manufacturer and can lead to serious negative consequences!
SCHEMATIC DIAGRAM ----------> LG 42LN54** 42LN54**-Z* Chassis LD31B/LD36B.
PSU SCHEMATIC DIAGRAM ----------> LG 37/39/42 Inch LGP3739-13PL1, LGP42-13PL1
The appearance of the MainBoard EAX64891306 is shown in the figure below:EAX64891306
EAX64891306 can be used in TVs:
LG 32LN540V (Panel LC320DUE (SF)(R1)), LG 42LN542V-ZD (Panel LC420DUE SFR3), LG 32LN541V (Panel LC320DUE (SF)(R1)), LG 42LA615V (Panel LC420DUE (SF)(U2) ), LG 32LA615V (Panel LC320DUE (SF)(U2)), LG 42LN540V (Panel LC420DUE (SF)(R1)), LG 42LN541V (Panel LC420DUE (SF)(R1)), LG 47LN540V (Panel LC470DUE (SF)(R1)), LG 32LB530U ZA (Panel LC320DXE (SG)(R1)), LG 39LN540V (Panel HC390DUN-VCFP1-11XX), LG 32LA643V (Panel LC320EUN (SF)(F1)), LG 32LN542V (Panel LC320DUE SF R1), LG 47LA615V (Panel LC470DUE (SF)(U2)), LG 47LA643V ZB (Panel LC470EUN (SF)(F2)), LG 32LN541U ZB (Panel HC320DXN-VHFP1 - 21XX / HC320DXN-VHFPA - 21XX), LG 32LN536U (Panel NC320DXN (SA)(P1)), LG 37LN541U (Panel LC370DXE (SF)(R1)).
The appearance of the power supply
Main features of the device LG 42LN541V:
Installed matrix (LED-panel) LC420DUE (SF) (R1).
The matrix control uses the Timing Controller (T-CON) LC500DUE-SFR1.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the MAP3202 PWM controller. As the power elements of the LED driver, keys of the type FDT86106, STF10NM60N are used.
The necessary supply voltages for all nodes of the LG 42LN541V TV are generated by the EAX64905301 power module or its analogs using SSC1S311A (PWM flyback), NR891D (PWM Step-down 24/12) microcircuits and MDF11N65B type power switches.
MainBoard - the main board (motherboard) is an EAX64891306 module, using CPU chips: LGE2121-MS; DRAM: H5TQ2G630FR; NAND Flash: SAA36254746F VER 03.13.72; SPI Flash: 25Q80; SOUND: STA3808WF; and others.
The TDSQ-G601D (B) tuner allows you to receive television programs and tune to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC420DUE-SFR1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: IPS, Normally Black, Transmissive
Active Area: 927.94x521.96 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 6/9 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 strings WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V