Technical description and composition of the LG 20LS2R TV, panel type and applicable modules. The composition of the modules.LG
Model: 20LS2R
Chassis / Version: LP69A
Panel: T200XW02 V.0
Lamp backlight: 6 Lamp CCFL
T-CON: T200XW02 V0 X PCB 06A09-1B
Inverter (backlight): integrated into PSU
Power Supply (PSU): EAY32636402 AIV-P0033
MainBoard: EAX32382701 (12)
IC MainBoard: CPU: LGE9689AD-LF, SPI Flash: 25L4005AM2C, EEPROM: 24C64, DDR: Hynix HY5DU281622FTP-5, Audio: YDA138-E
Tuner: TAFT-W005D
Specifications 20LS2R
LG 20LS2R
General recommendations for repairing TV LCD
Possible malfunctions
- LG 20LS2R 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.
Often in such cases, the EAY32636402 power module is faulty. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, it is necessary to check the serviceability of power switches and rectifier diodes for possible breakdown (short circuit).
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
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 microcircuits are usually checked by replacement with new ones, or obviously working.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
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.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- 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 EAX32382701 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 it, you should check its elements - SPI Flash: 25L4005AM2C, Audio: YDA138-E 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 changing the TAFT-W005D tuner, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding tuner pins and checked 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 20LS2R TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
Service manual and schematic diagram ----------------> LG 20LS2R Chassis LP69A
FIRMWARE FOR SPI FLASH, EEPROM LG 20LS2R LP69A, Main: EAX32382701 (12), Panel: T200XW02 V.0.
The appearance of the MainBoard EAX32382701 is shown in the figure below:EAX32382701
The appearance of the power supply
Main features of the device LG 20LS2R:
Installed matrix (LCD-panel) T200XW02 V.0.
The matrix control uses the Timing Controller (T-CON) T200XW02.
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 20LS2R TV is carried out by the EAY32636402 power module, or its analogs.
MainBoard - the main board (motherboard) is an EAX32382701 module, using CPU chips: LGE9689AD-LF, SPI Flash: 25L4005AM2C, EEPROM: 24C64, DDR: Hynix HY5DU281622FTP-5, Audio: YDA138-E and others.
The TAFT-W005D tuner provides TV reception and channel tuning.