Technical description and composition of the LG 49LF510V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 49LF510V -ZA
Chassis / Version: LD55C
Panel: DC490DUE
LED driver (backlight): integrated into MainBoard
PWM LED driver: DT1641AS
MOSFET LED driver: SMN630L, MBR10U100
Power Supply (PSU): Adapter 19V
MainBoard: EAX66704203 (1.0)
IC MainBoard: CPU: LGE2136 A7MM227G, SPI FLASH: MX25L8035EM2I-10G EEPROM: ATMLH530 2EC, AUDIO: NTP-7515:
Tuner: TDJN-G101D
Specifications 49LF510V
LG 49LF510V
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 49LF510V does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
In some of these cases, the main switching power supply, the Adapter module, is faulty.
This TV model is equipped with an external power adapter type Adapter 19V, which the owner can purchase independently, and repairing it may not always be advisable, however, sometimes there is a certain sense to open it and eliminate simple typical defects typical of IPS. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters for a short circuit.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
In some of these cases, the malfunction is caused by a lack of backlighting on the display. 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 turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the EAX66704203 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 complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its CPU chips: LGE2136 A7MM227G, SPI FLASH: MX25L8035EM2I-10G EEPROM: ATMLH530 2EC, AUDIO: NTP-7515: and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
Before changing the tuner TDJN-G101D, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Owners and users of the LG 49LF510V 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!
firmware SPI FLASH ----------------> LG 49LF510V -ZA LD55C, Main: EAX66704203 (1.0) , Panel: NC490DUE
More details on this pageTo reduce the backlight current in LED drivers with a DT1641AS controller (DT1641S), you can increase the total resistance of the resistors from pin 7 (RISET) to the chassis. The exact proportional dependence may not be observed if there is additional control on this input, then the ratings should be selected empirically.
The appearance of the MainBoard EAX66704203 is shown in the figure below:EAX66704203
Main features of the device LG 49LF510V:
Installed matrix (LED-panel) DC490DUE.
To power the backlight LEDs, a converter is used, combined with the main board EAX66704203, controlled by the DT1641AS PWM controller. As power elements of the LED driver, keys of the type SMN630L, MBR10U100 are used.
To power all the internal components of the LG 49LF510V TV, an external adapter 19V type source is used.
MainBoard - the main board (motherboard) is an EAX66704203 module using CPU chips: LGE2136 A7MM227G, SPI FLASH: MX25L8035EM2I-10G EEPROM: ATMLH530 2EC, AUDIO: NTP-7515: and others.
The TDJN-G101D tuner provides TV reception and channel tuning.
