Technical description and composition of the LG 42LB565V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 42LB565V
Chassis / Version: LC43B / LD43B / LB43T
Panel: LC420DUE (FG) (A3)
LED backlight: LG lnnotek DRT 3.0 42
T-CON: 6870C-0480A
LED driver (backlight): integrated into PSU
PWM LED driver: BD9486F, NR134S
Power Supply (PSU): EAX65423701 (2.1)
PWM Power: MAP8800 (PFC), FA6A01N (PWM resonant), NR134S
MOSFET Power: TK7P60W
MainBoard: EAX65388005 (1.0)
IC MainBoard: LGE2132 / A7MKM69C, H27U1G8F2CTR, 74LCX244, TPS65282, 25Q80BVSIG, TAS5733, A8303
Tuner: TDJM-G101D
Specifications 42LB565V
LG 42LB565V
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 42LB565V 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.
Often in such cases, the EAX65423701 power module is faulty. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches (TK7P60W) and rectifier diodes for a probable short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM chips MAP8800 (PFC), FA6A01N (PWM resonant), NR134S are usually 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.
As a rule, in such cases there is no display backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source. By opening the panel, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as a health indicator. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the EAX65388005 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements LGE2132 / A7MKM69C, H27U1G8F2CTR, 74LCX244, TPS65282, 25Q80BVSIG, TAS5733, A8303. BGA chip malfunctions are usually easy to detect by warming up.
Before replacing the TDJM-G101D tuner, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Once again, remind users! Attempts to self-repair the LG 42LB565V TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
Backlight Current Limit:
In televisions with power supplies LGP3942-14PL1 (EAX65423701), the backlight current sensor - the resistor block R811-R818 consists of four pairs of 4.3 Ohm each. You can reduce the backlight current by 25% by removing one pair of resistors.
Schematic diagram ------------> CHASSIS : LD43B/LD44B MODEL : 42LB56** 42LB56**-Z*.
The appearance of the MainBoard EAX65388005 is shown in the figure below:EAX65388005
EAX65388005 can be used in TVs:
LG 32LB561U (Panel NC320DXN VSBP1), LG 42LB563V (Panel LC420DUE (FG)(A3)), LG 32LB565U ZQ (Panel LC320DXE (FG)(A3)), LG 42LB561V ZE (Panel LC420DUE (FG)(A3)), LG 49LB552V ZA (Panel LC490DUE (FG)(A6) ), LG 42LB565V (Panel LC420DUE (FG)(A3)), LG 32LB628U 32LB628U-ZB.BRUWLDU (Panel LC320DXE (FG)(P2)), LG 47LB561V-ZE 47LB561V (Panel LC470DUE( FG)(A3)).
The appearance of the power supply
Main features of the device LG 42LB565V:
Installed matrix (LED-panel) LC420DUE (FG) (A3).
The matrix control uses the Timing Controller (T-CON) 6870C-0480A.
To power the backlight LEDs, a converter is used, combined with a power supply, it is controlled by the BD9486F, NR134S PWM controller.
The necessary supply voltages for all nodes of the LG 42LB565V TV are generated by the EAX65423701 power supply module or its analogs using MAP8800 (PFC), FA6A01N (PWM resonant), NR134S microcircuits and TK7P60W power switches.
MainBoard - the main board (motherboard) is an EAX65388005 module, using LGE2132 / A7MKM69C, H27U1G8F2CTR, 74LCX244, TPS65282, 25Q80BVSIG, TAS5733, A8303 and others microcircuits.
The TDJM-G101D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC420DUE-FGA3
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 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V