Technical description and composition of the LG 22LK311 TV, panel type and applicable modules. The composition of the modules.LG
Model: 22LK311
Chassis / Version: LP91J
Panel: 720 hd
Lamp backlight: 4 Lamp CCFL
Inverter (backlight): integrated into PSU;
Power Supply (PSU): EAX61391101 / 13 LGP22-10L
MainBoard: EAX64045802 (0)
IC MainBoard: CPU: LGE4767A-LF-SB, SPI Flash: MX25L644
Tuner: TAFJ-H001F
Specifications 22LK311
LG 22LK311
General recommendations for repairing TV LCD
Possible malfunctions
- The LG 22LK311 TV does not turn on, does not respond to the remote control and the control panel buttons, does not light up or blink indicators.
Often in such cases, the EAX61391101 power module is faulty. It is necessary to measure its output voltages, and in case of their absence, check the operability of the power switches of the converters and rectifier diodes for the probability of 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.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM), if they do not have visible damage to the chassis and open short circuit between the terminals, are usually checked by replacement.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the power supply of the inverter are serviceable, you should make sure that the lamps are in good working condition, then you need to check the converter keys and the secondary windings of the transformers.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- 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 EAX64045802 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: LGE4767A-LF-SB, SPI Flash: MX25L644. BGA chip malfunctions are usually easy to detect by warming up.
Before changing the tuner TAFJ-H001F, if it is not possible to tune to television channels, you should make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
TV users and owners need to remember that attempts to self-repair a LG 22LK311 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
FIRMWARE FOR SPI FLASH LG 22LK311 LP91J, Main: EAX64045802 (0)
The appearance of the MainBoard EAX64045802 is shown in the figure below:EAX64045802
The appearance of the power supply
Main features of the device LG 22LK311:
Installed matrix (LCD-panel) 720 hd.
To power the backlight, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the LG 22LK311 TV is carried out by the EAX61391101 power module, or its analogues.
MainBoard - the main board (motherboard) is an EAX64045802 module using CPU chips: LGE4767A-LF-SB, SPI Flash: MX25L644 and others.
The TAFJ-H001F tuner provides TV reception and channel tuning.