Technical description and composition of the LG 40LF630V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 40LF630V 40LF630V-ZA.BRUJLDU
Chassis / Version: LD / LE51H
Panel: V400HJ6-PE2 HC400DUN-VCKN1-214X
LED backlight: DRT4.0 REV0 7 B-Type SVL400
T-CON: NoName
LED driver (backlight): integrated into PSU
PWM LED driver: LC5901
Power Supply (PSU): EAX66163001 EAY63630401 LGP40FI-15CH1
PWM Power: MAP8800, SSC3S901
MainBoard: EAX66207203 (1.0)
IC MainBoard: K4B4G1646D-BCK0, TPS65175B, NTP7515D
Tuner: TDJM-G301D
Control: Remote: AKB74455401
Specifications 40LF630V
LG 40LF630V
General repair guidelines for TV LCD LED
Possible manifestations of defects
- LG 40LF630V TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
Most often, with such manifestations, the main power module EAX66163001 is found to be faulty. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, it is necessary to check the serviceability of power switches and rectifier diodes for possible breakdown (short circuit).
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM), if they do not have visible damage to the chassis and open short circuit between the terminals, are usually checked by replacement.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
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. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the black to the cathode. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the EAX66207203 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). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard board - K4B4G1646D-BCK0, TPS65175B, NTP7515D. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the tuner TDJM-G301D. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Attention to users! Self-repair of the LG 40LF630V TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
schematic diagram -------------> LG 40LF630V Chassis LD/LE51H.
CHASSIS : LB51H; MODEL : 40LF63**, 40LF63**-T*
The appearance of the MainBoard EAX66207203 is shown in the figure below:EAX66207203
EAX66207203 can be used in TVs:
LG 50LF653V (Panel LC500DUH (MG)(P1)), LG 40LF630V 40LF630V-ZA.BRUJLDU (Panel V400HJ6-PE2 HC400DUN-VCKN1-214X), LG 40LF634V (Panel V400HJ6-PE2 Rev.C1 HC400DUN-VCKN1-214X).
The appearance of the power supply
Main features of the device LG 40LF630V:
Installed matrix (LED-panel) V400HJ6-PE2 HC400DUN-VCKN1-214X.
The matrix control uses the NoName Timing Controller (T-CON).
To power the backlight LEDs, a converter is used, combined with the power supply, controlled by the LC5901 PWM controller.
The necessary supply voltages for all nodes of the LG 40LF630V TV are generated by the EAX66163001 power module or its analogs using MAP8800, SSC3S901 microcircuits.
MainBoard - the main board (motherboard) is an EAX66207203 module, using microcircuits K4B4G1646D-BCK0, TPS65175B, NTP7515D and others.
The TDJM-G301D tuner provides TV reception and channel tuning.