Technical description and composition of the LG OLED55C7V TV, panel type and applicable modules. The composition of the modules.LG OLED
Model: OLED55C7V -Z
Chassis / Version: LJ SHASSIS
Panel: LC650AQD-EKA1
Power Supply (PSU): EAX67149611 LGP55C7-170P
MainBoard: EAX67125703 (1.1) EBT64597601
IC MainBoard: LG5323A1, SW51201, SW51200, RT7235, TC58NVG2S5H, M15T1G1664A, K4B1G16
Tuner: TDJN-G501D
Technical Specifications OLED55C7V
LG OLED55C7V
General repair guidelines for TV LCD OLED
Possible manifestations of defects
- LG OLED55C7V does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
Usually with such manifestations, the defect is caused by faulty elements in the main power module LGP55C7-170P. It is necessary to measure its output supply voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more 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 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.
- 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 EAX67125703 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). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - LG5323A1, SW51201, SW51200, RT7235, TC58NVG2S5H, M15T1G1664A, K4B1G16 and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
Before replacing the TDJN-G501D 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
Attention! For users and owners of OLED55C7V TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempts to self-repair in order to avoid negative consequences that can lead to complete non-repairability of the device.
The appearance of the MainBoard EAX67125703 is shown in the figure below:EAX67125703
The appearance of the power supply
Main features of the device LG OLED55C7V:
Installed matrix (OLED panel) LC650AQD-EKA1.
The formation of the necessary supply voltages for all nodes of the LG OLED55C7V TV is carried out by the EAX67149611 power supply module, or its analogs.
MainBoard - the main board (motherboard) is an EAX67125703 module, using chips LG5323A1, SW51201, SW51200, RT7235, TC58NVG2S5H, M15T1G1664A, K4B1G16 and others.
The TDJN-G501D tuner provides television reception and channel tuning.
