Technical description and composition of the LG 26LN467U TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 26LN467U
Chassis / Version: LE33A / LD33P
Panel: LC260EXN (SD) (A1)
T-CON: LC260EXN-SDA1 6870S-1160A
LED driver (backlight): integrated into T-CON
PWM LED driver: BD9261EFV
Power Supply (PSU): Adapter 19V
MainBoard: EAX65085302 (1.1) EBR77262801
IC MainBoard: CPU: LGE2122, Eeprom: 24C256, Audio: NTP7513
Tuner: TDSQ-G601D (B) EBL61240503
Control: IR: EAX64661001 (1.4), WIFI: TWFM B006D EAT61813901
Specifications 26LN467U
LG 26LN467U
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The LG 26LN467U 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.
Failure in such cases should begin to look in the adapter power supply circuits.
The owner of the TV usually acquires an external power source such as Adapter 19V on their own, it often happens that its repair is impractical, but the simplest defects characteristic of the IIP can be seen and easily fixed after opening. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the elements of the primary circuit, the mains fuse usually 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.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
Often in such cases, there is no LED backlight. Often the cause is a malfunction of the LEDs (open circuit, short circuit ...), or the connectors of the strips (strings), less often the LED driver is malfunctioning.
To check the health in the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can test each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the EAX65085302 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). When repairing an MB board, you need to check its CPU components: LGE2122, Eeprom: 24C256, Audio: NTP7513. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
If there is no reception of television channels, but the TV is working properly from external devices, first of all you need to check the voltage of the tuner TDSQ-G601D (B) EBL61240503 and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
FIRMWARE FOR EEPROM --------------> LG 26LN467U LE33A/LD33P, Main: EAX65085302 (1.1) EBR77262801, Panel: LC260EXN (SD)(A1)
The appearance of the MainBoard EAX65085302 is shown in the figure below:EAX65085302
Main features of the device LG 26LN467U:
Installed matrix (LED-panel) LC260EXN (SD) (A1).
The matrix control uses the Timing Controller (T-CON) LC260EXN-SDA1.
An integrated LED driver is used to power the backlight LEDs, controlled by the BD9261EFV PWM controller.
To power all the internal components of the LG 26LN467U TV, an external adapter 19V type source is used.
MainBoard - the main board (motherboard) is an EAX65085302 module, using CPU chips: LGE2122, Eeprom: 24C256, Audio: NTP7513 and others.
Tuner TDSQ-G601D (B) EBL61240503 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC260EXN-SDA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 350 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V