Technical description and composition of the LG 32LF653V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LF653V ZC
Chassis / Version: LD51H
Panel: LC320DUH (MG) (P1)
LED backlight: 6916L-1980A, 6916L-1981A
LED driver (backlight): integrated into PSU
Power Supply (PSU): EAX66171501 (2.1) LGP32D-15CH1
PWM Power: SSC3S111
MOSFET Power: MDF11N65B
MainBoard: EAX66207203 (1.0) RD5N621F1K
IC MainBoard: AT24C256, H26M31001HPR (e-NAND), K4B4G1646D-BCK0, K4B2G1646Q-BCK0, TPS65175B, NTP7515D
Tuner: TDJM-G301D
Specifications 32LF653V
LG 32LF653V
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 32LF653V TV does not turn on at all. There is no reaction to the remote control and control buttons from the front panel. Indicator lights do not light or flash.
With such manifestations, the EAX66171501 power module usually fails. It is then necessary to measure its output voltages and, if they are absent, you should check the power switches and rectifier diodes of the converters for the probability of a short circuit.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often 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 the excess of maximum current or voltage values. 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, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
The most likely in these cases is a malfunction of the LED backlight. The reason can be both in the power of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
- 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 (1.0) 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). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements AT24C256, H26M31001HPR (e-NAND), K4B4G1646D-BCK0, K4B2G1646Q-BCK0, TPS65175B, NTP7515D requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the TDJM-G301D tuner and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Attention! For users and owners of 32LF653V TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-serviceability of the device.
Service manual and schematic diagram LG 32LF653V Chassis LD51H
You can reduce the backlight current in TVs with LGP32D-15CH1 power supplies (EAX66171501) if you increase the resistance of the current sensor - the R816 resistor from 2.4 Ohm to 3 Ohm. Then the backlight current will proportionally decrease from 250 mA to 200 mA. If you install a 3.3 Ohm resistor, the current will decrease to 180 mA.
More details on this page
The appearance of the MainBoard EAX66207203 (1.0) is shown in the figure below:EAX66207203 (1.0)
The appearance of the power supply
Main features of the device LG 32LF653V:
Installed matrix (LED-panel) LC320DUH (MG) (P1).
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the LG 32LF653V TV are generated by the EAX66171501 power module, or its analogs using SSC3S111 microcircuits and power switches of the MDF11N65B type.
MainBoard - the main board (motherboard) is an EAX66207203 (1.0) module, using AT24C256, H26M31001HPR (e-NAND), K4B4G1646D-BCK0, K4B2G1646Q-BCK0, TPS65175B, NTP7515D and others.
The TDJM-G301D tuner provides TV reception and channel tuning.