Technical description and composition of the LG 32LF510U TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LF510U ZB
Chassis / Version: LD55A
Panel: HC320DXN - ABNS4 - 2112
LED backlight: LG lnnotek Direct 32inch CSP Rev.04 150217
T-CON: HV320VXC-200
LED driver (backlight): integrated into Mainboard
PWM LED driver: DT1641AS
MOSFET LED driver: D2922
Power Supply (PSU): LCAP16B-E Adapter 19V 2.2A
MainBoard: EAX66408104 (1.1)
IC MainBoard: LGE2136, MX25L8035E, NTP7515
Tuner: TDJN-G101D
Control: AKB74475403
Specifications 32LF510U
LG 32LF510U
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 32LF510U TV does not turn on. There are no signs of operability. The indicators on the front panel do not shine and do not blink, and the remote control and control buttons do not respond.
Failure in such cases should be sought in the LCAP16B-E power supply circuits.
This TV model is equipped with an external power supply unit such as LCAP16B-E Adapter 19V 2.2A, which the owner can purchase independently, and repairing it may not always be advisable, however, sometimes it makes some sense to open it and eliminate simple typical defects typical for IIP. It is necessary to measure the secondary output voltage, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse 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. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may be PWM (PWM). It is checked only by replacement with a known good one.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
In such cases, the most likely malfunction of the LED backlight elements. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
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 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 a health indicator. 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 EAX66408104 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 attempts to repair the MB board (SSB), it is necessary to check the serviceability of its elements - LGE2136, MX25L8035E, NTP7515 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).
Before replacing the TDJN-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, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
SCHEMATIC MANUAL ----------------> LG Chassis LD55A LD55B Model 32LF510U, 32LF510U-ZB, 32LF510B, 32LF510B-ZB
To reduce the backlight current in LED drivers with the 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.
More details on this page
The appearance of the MainBoard EAX66408104 is shown in the figure below:EAX66408104
The appearance of the power supply
Main features of the device LG 32LF510U:
Installed matrix (LED-panel) HC320DXN - ABNS4 - 2112.
The matrix control uses the Timing Controller (T-CON) HV320VXC-200.
An integrated LED driver is used to power the backlight LEDs, it is controlled by the DT1641AS PWM controller. As power elements of the LED driver, keys of the D2922 type are used.
To power all the internal components of the LG 32LF510U TV, an external source of the LCAP16B-E Adapter 19V 2.2A type is used.
MainBoard - the main board (motherboard) is an EAX66408104 module, using LGE2136, MX25L8035E, NTP7515 and other chips.
The TDJN-G101D tuner provides TV reception and channel tuning.