Technical description and composition of the LG 42LE4508 TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 42LE4508 ZA
Chassis / Version: LD01D
Panel: T420HW07 V.5
LED driver (backlight): integrated into PSU
Power Supply (PSU): EAY60803202 YP42LPBA
PWM Power: IC_Power
MainBoard: EAX61766102 (0)
IC MainBoard: CPU: LGE101DB-LF-T8, SDRAM: K4B1G1646E-HCH9, Flash: W25Q80, EEPROM: 24C1024
Tuner: TDTJ-S001D EBL60721201
Appearance
LG 42LE4508
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The LG 42LE4508 TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
In the vast majority of such cases, a malfunction is detected in the EAY60803202 power module. It is necessary to measure the secondary output voltage, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
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. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power key can be PWM IC_Power. It is checked only by replacement with a known good one.
- 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.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then it is necessary to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction or dual LEd are used, then the PN junction of the emergency zener diode can indirectly serve as a health indicator. In case of LED-a failure, the zener diode PN junction will either be cut off or broken into short-circuit.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the EAX61766102 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). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard - CPU: LGE101DB-LF-T8, SDRAM: K4B1G1646E-HCH9, Flash: W25Q80, EEPROM: 24C1024. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
If the TV works normally from external devices, but does not tune into television channels, the TDTJ-S001D EBL60721201 tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
We recommend the owners of the 42LE4508 TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
schematic diagram ------------> LG 42LE4500, 42LE4500-ZA, 42LE4508, 42LE4508-ZA, 42LE450N, 42LE450N-ZA Chassis LD01D
The appearance of the MainBoard EAX61766102 is shown in the figure below:EAX61766102
EAX61766102 can be used in TVs:
LG 42LE4500 ZA (Panel LC420EUG), LG 42LE4508 ZA (Panel T420HW07 V.5), LG 37LE5300 (Panel LC370EUH (SC)(A1)), LG 32LE4500 ZA (Panel T315HW05 V.3), LG 32LE5300 ZA (Panel T315HW05 V.1), LG 32LE3300 32LE3300-ZA.BRUWLJU (Panel LC320EXN (SC)(A1)), LG 37LE4500 37LE4500-ZA (Panel T370HW04 V.4 ), LG 32LE5450 -ZA (Panel LC320EUH (SC)(A1)).
The appearance of the power supply
Main features of the device LG 42LE4508:
Installed matrix (LED-panel) T420HW07 V.5.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the LG 42LE4508 TV are generated by the EAY60803202 power module or its analogs using IC_Power microcircuits.
MainBoard - the main board (motherboard) is an EAX61766102 module using CPU chips: LGE101DB-LF-T8, SDRAM: K4B1G1646E-HCH9, Flash: W25Q80, EEPROM: 24C1024 and others.
The TDTJ-S001D EBL60721201 tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T420HW07 V5
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA3, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 400 cd / m²
Contrast Ratio: 4000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V