Technical description and composition of the LG 42LE4500 TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 42LE4500 ZA
Chassis / Version: LD01D
Panel: LC420EUG
LED driver (backlight): integrated into PSU
Power Supply (PSU): 3PCGC10008A-R (PWM Push-Pull)
PWM Power: VIPER27H, L6599
MainBoard: EAX61766102 (0)
IC MainBoard: SAA34907920 Ver.3.5.7, K4B1G1646E-HCH9, SAA35408805, 24C08WI,
Tuner: TDTJ-S001D EBL60721201
Specifications 42LE4500
LG 42LE4500
General repair guidelines for TV LCD LED
Repair of all electronic devices, including the LG 42LE4500 TV, it is advisable to start with an external examination of its external and internal elements. In some cases, visible external damage to the elements can suggest the direction of troubleshooting and localization of the defect even before the start of the necessary measurements at the control points of the nodes of electronic circuits. If charred resistors, swollen electrolytic or cermet capacitors, ring cracks in the solders of the terminals of transformers or heating elements are found, it is advisable to establish the causes and consequences of the malfunction that has arisen, as well as to check the connected elements and assemblies.
If the LG 42LE4500 does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a 3PCGC10008A-R power supply module malfunctioning. In some cases, only the processor power regulator may be faulty. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is broken in the power supply, in most cases a breakdown of the power key (s) is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
Mos-Fet keys used in switching power supplies (SMPS) rarely fail for no reason to look for when checking other circuit elements. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM controller chip can also cause a breakdown of the power switch of the converter.
If the LG 42LE4500 does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction in the backlight LED circuit of the LC420EUG panel, or their power converter - LED driver. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the LED driver itself, including in the secondary rectifier of the main PSU.
A malfunction in the backlight circuits often occurs due to an open in the power circuit of the LED lines. It is necessary to disassemble the panel and check the LEDs themselves, the soldering of their conclusions, as well as the reliability of the connections in the connectors and the soldering of the conclusions of the connectors.
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.
Repair of the EAX61766102 (0) motherboard should begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
Board repair and chip replacement SAA34907920 Ver.3.5.7, K4B1G1646E-HCH9, SAA35408805, 24C08WI, are carried out 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 its supply voltage and carefully solder it from the planar elements, including the metal parts of the case and partitions. Read more about the recovery method on the Repair Tuner TDTJ-S001D page.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
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)).
Main features of the device LG 42LE4500:
Installed matrix (LED-panel) LC420EUG.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the LG 42LE4500 TV are generated by the 3PCGC10008A-R power supply module or its analogs using VIPER27H, L6599 microcircuits.
MainBoard - the main board (motherboard) is an EAX61766102 module, using chips SAA34907920 Ver.3.5.7, K4B1G1646E-HCH9, SAA35408805, 24C08WI, and others.
The TDTJ-S001D EBL60721201 tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: RAKEN
Model: LC420EUG-RDA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: IPS, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 400 cd / m²
Contrast Ratio: 1600: 1
Display Colors: 1.06B (8-bit + Dithering), CIE1931 72%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: Mini LVDS, 120 pins
Voltage: 12.0V