Technical description and composition of the LG 32LH604V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LH604V
Chassis / Version: LD66H
Panel: LC320DUE-FJM1
LED backlight: Innotek Direct 16Y 32 FHD A-Type Rev0.0 151105
T-CON: HV320FHB-N00 47-6021049
LED driver (backlight): integrated into PSU
Power Supply (PSU): EAX66752501 (1.8)
PWM Power: 3S211
MOSFET Power: K8A65W
MainBoard: EAX66769503 (1.2)
IC MainBoard: CPU: LGE6321, EEPROM: ATML 2EC - 24C256, Audio: NTP7515D
Tuner: TDJA-G301D
Specifications 32LH604V
LG 32LH604V
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 32LH604V TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
Most often, with such manifestations, the main power supply module EAX66752501 is found to be faulty. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches (K8A65W) and rectifier diodes in the converters for a short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM 3S211 microcircuits are usually checked by replacing with new ones, or obviously working.
- 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.
In most of these cases, a malfunction is detected in the nodes and backlight elements of the LED panel. 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.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, 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 TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the EAX66769503 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 CPU elements: LGE6321, EEPROM: ATML 2EC - 24C256. BGA chip malfunctions are usually easy to detect by warming up.
Before replacing the TDJA-G301D tuner, if there is no tuning to 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
Attention! For users and owners of 32LH604V TVs who do not have the appropriate qualifications, knowledge and experience, we strongly recommend against attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
The appearance of the MainBoard EAX66769503 is shown in the figure below:EAX66769503
Main features of the device LG 32LH604V:
Installed matrix (LED-panel) LC320DUE-FJM1.
The matrix control uses the Timing Controller (T-CON) HV320FHB-N00.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages are generated for all nodes of the LG 32LH604V TV by the EAX66752501 power module, or its analogs using 3S211 microcircuits and K8A65W type power switches.
MainBoard - the main board (motherboard) is an EAX66769503 module using CPU chips: LGE6321, EEPROM: ATML 2EC - 24C256, Audio: NTP7515D and others.
The TDJA-G301D tuner provides TV reception and channel tuning.