Technical description and composition of the LG 26LS3500 TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 26LS3500
Chassis / Version: LD21A
Panel: LC260EXN (SD) (A1) // T260XVN0 1.4
LED driver (backlight): integrated into MainBoard
PWM LED driver: DT1641S
MOSFET LED driver: AP18T10GH
Power Supply (PSU): ALX-2430 Adapter AC / DC 24V 3A
MainBoard: EAX64702603 (1.0)
IC MainBoard: CPU: LGE2111A-T8, APSW286ZC, SPI Flash: W25Q80BVSIG, EEPROM: 24C256
Tuner: TDSS-G101D
Control: Remote: AKB73655802
Specifications 26LS3500
LG 26LS3500
General repair guidelines for TV LCD LED
Repair of the LG 26LS3500 TV is advisable to start with a careful external examination of both internal and external elements. Often, based on certain external signs, it may be possible to draw certain conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
In cases where the LG 26LS3500 TV does not turn on, does not respond to the remote control and buttons, no indicators on the front panel are lit or blinking, and there are no sounds and no signs of operability when turning on, the power module is most likely faulty or there is no processor power on motherboard (a typical defect of some models of LG TVs). In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should begin by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM controller chip are subject to verification, which it is desirable to verify by replacement.
If the LG 26LS3500 does not have an image, but there is sound, the backlight LEDs of the LC260EXN (SD) (A1) panel or their power converter may be malfunctioning. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
To check the health of the LEDs, as well as contact connections in the ruler circuit, it is necessary to disassemble the panel.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts is required, and ideally, a current source.
Repair or diagnostics of the EAX64702603 (1.0) motherboard should begin by checking the stabilizers or power converters of its chips. If necessary, you should update the software (software).
Board repair and replacement of CPU chips: LGE2111A-T8, APSW286ZC, SPI Flash: W25Q80BVSIG, EEPROM: 24C256 are made with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the tuner TDSS-G101D.
Owners and users of the LG 26LS3500 TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Download: Service manual and circuit LG Chassis LD21A; 26LS3500 / 350S / 350T / 3510, 26LS3500 / 350S / 350T-ZA 26LS3510-ZB, 26LS3590 / 359S / 359T, 26LS3590 / 359S / 359T-ZC SERVICE MANUAL.
To reduce the backlight current in LED drivers with the DT1641AS controller (DT1641S), you can increase the total resistance of the resistors from pin 7 (RISET) to the chassis. The exact proportional dependence may not be observed if there is additional control on this input, then the ratings should be selected empirically.
More details on this page
The appearance of the MainBoard EAX64702603 is shown in the figure below:EAX64702603
EAX64702603 can be used in TVs:
LG 26LS3500 (Panel LC260EXN (SD) (A1)), LG 26LS3510 ZB.BRUYLJU (Panel LC260EXN (SD) (A1)), LG 22LS3500 22LS3500-ZA (Panel V216BG1-LE1 REV.C1).
Main features of the device LG 26LS3500:
Installed matrix (LED-panel) LC260EXN (SD) (A1) or T260XVN0 1.4.
To power the backlight LEDs, a converter is used, combined with the EAX64702603 main board, controlled by the DT1641S PWM controller. As power elements of the LED driver, keys of the type AP18T10GH are used.
To power all the internal components of the LG 26LS3500 TV, an external source of the ALX-2430 Adapter AC / DC 24V 3A type is used.
MainBoard - the main board (motherboard) is an EAX64702603 module using CPU chips: LGE2111A-T8, APSW286ZC, SPI Flash: W25Q80BVSIG, EEPROM: 24C256 and others.
The TDSS-G101D tuner provides TV reception and channel tuning.
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