Technical description and composition of the LG 32LH510U TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LH510U
Chassis / Version: LD67C
Panel: HC320DXN-VSVS1 - 511X
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP3378E
MOSFET LED driver: AOD2922
Power Supply (PSU): ADS-45FSN-19 EAY63190102 Adapter 19V 1.2A
MainBoard: EAX66805906 (1.0)
IC MainBoard: GE6351, H27U1G8F, MX25L8035E, LCX244, MP2315 (TSOT23-8 Marking: AGCG), DT1803A, SN1406035, NTP7515D
Tuner: TDJA-G301D
Specifications 32LH510U
LG 32LH510U
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The LG 32LH510U TV does not turn on at all. The control lights do not light or flash. On the remote control and the buttons on the control panel does not respond.
In the vast majority of such cases, a malfunction is detected in the ADS-45FSN-19 power supply module.
The external ADS-45FSN-19 EAY63190102 Adapter 19V 1.2A power supply unit is not always subject to repair, especially since the owner can purchase it independently. But, in some cases, it makes sense to open it and eliminate the simple typical defects inherent in converters in pulsed sources. It is necessary to measure its 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 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, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
Often in such cases, there is no LED backlight. 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.
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 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 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 EAX66805906 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 GE6351, H27U1G8F, MX25L8035E, LCX244, MP2315 (TSOT23-8 Marking: AGCG), DT1803A, SN1406035, NTP7515D. BGA chip malfunctions are usually easy to detect by warming up.
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 voltages at the terminals of the TDJA-G301D tuner. 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.
For owners of the 32LH510U TV, we recommend that you contact qualified personnel with the necessary work experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
Service manual and schematic diagram -----------------------------> LG 32LH510U Chassis LD67C.
32LH51**, 32LH51**-ZA/ZC/ZE/ZG, 32LH520U
To reduce the backlight current in LED drivers with the MP3378E PWM controller, it is necessary to proportionally increase the total resistance of the resistors from pin 3 (RISET) to the chassis. Calculation of current in milliamperes and resistance in kilo-ohms 977 / Rset for each channel. Parallel channels are summed. For example, for four parallel channels and a RISET 10 KOhm resistance, the total current will be 97.7 * 4 = 391 mA.
More details on this page
The appearance of the MainBoard EAX66805906 is shown in the figure below:EAX66805906
EAX66805906 can be used in TVs:
LG 32LH510U (Panel HC320DXN-VSVS1 - 511X), LG 43LH513V (Panel HC430DUN-SLVX1 - 511X), LG 32LH520U (Panel HC320DXN-ABVS2-5112), LG 43LH520V (Panel LC430DUE (FJ)(A1)), LG 32LH513U LG 32LH513U-ZE (Panel HC320DXN-VHVS1-214X), LG 49LH520V (Panel LC490DUE (FJ)(A1)).
The appearance of the power supply
Main features of the device LG 32LH510U:
Installed matrix (LED-panel) HC320DXN-VSVS1 - 511X.
To power the backlight LEDs, a converter is used, combined with the main board EAX66805906, controlled by the MP3378E PWM controller. As power elements of the LED driver, keys of the AOD2922 type are used.
To power all the internal components of the LG 32LH510U TV, an external source of the ADS-45FSN-19 EAY63190102 Adapter 19V 1.2A type is used.
MainBoard - the main board (motherboard) is an EAX66805906 module, using the GE6351, H27U1G8F, MX25L8035E, LCX244, MP2315 (TSOT23-8 Marking: AGCG), DT1803A, SN1406035, NTP7515D and others microcircuits.
The TDJA-G301D tuner provides TV reception and channel tuning.