Technical description and composition of the LG 32LX4DC-UB TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LX4DC-UB
Chassis / Version: LA53A
Panel: LC320W01-SL18, LC320W01-SL14, LC320W01-SL11
Power Supply (PSU): 6871TPT303B, DU / DN / DI-32LP10 BRAND
MainBoard: 32LX4DC-UA BRAND LA53A
IC MainBoard: PQ05DZ1U, CXA2181Q, MSP4440G-QA-C13-101, SC1565IST-1.8, NSP-2100A
Appearance
LG 32LX4DC-UB
General recommendations for repairing TV LCD
Repair of all electronic devices, including the LG TV, made on the basis of the LA53A chassis, it is advisable to start with an external examination of its external and internal elements. Specific external damage to some elements can sometimes indicate further actions to determine the malfunction of the TV and localize the defect before the necessary measurements are taken. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
Sometimes the LG 32LX4DC-UB TV just doesn’t turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the 6871TPT303B common power module, DU / DN / DI-32LP10 BRAND. If it is working properly, you need to check the processor batteries on the SSB (Main Board). When diagnosing and repairing the power supply, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. When it is broken, the power elements of transistors and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
In most cases, key breakdowns in switching power supplies (SMPS) do not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM chip from the manufacturer.
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when you turn on, but there is sound and other functions work, there is a high probability of a malfunction of the inverter (power converter for the backlight). In such cases, the lamps, the inverter and the common power module are subject to verification, in which the electrolytic capacitors of the rectifier filter feeding the inverter should be checked. When disabling protection in order to enable the diagnosis of a malfunction, special care should be taken, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software). If it is not possible to replace the MB board (SSB), you need to check the health of its elements - PQ05DZ1U, CXA2181Q, MSP4440G-QA-C13-101, SC1565IST-1.8, NSP-2100A. Defective components should be replaced.
Attention! For users and owners of 32LX4DC-UB TVs who do not have the appropriate qualifications, knowledge and experience, we strongly recommend against attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
SCHEMATIC MANUAL -----------------------> LG 32LX4DC-UB/32LX4DCS-UB Chassis LA53A
Main features of the device LG 32LX4DC-UB:Installed matrix (LCD panel) LC320W01-SL18, LC320W01-SL14, LC320W01-SL11.
The formation of the necessary supply voltages for all nodes of the LG 32LX4DC-UB TV is carried out by the power supply module 6871TPT303B, or its analogs.
MainBoard - the main board (motherboard) is a 32LX4DC-UA module, using microcircuits PQ05DZ1U, CXA2181Q, MSP4440G-QA-C13-101, SC1565IST-1.8, NSP-2100A and others.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC320W01-SL18
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (6-bit + Hi-FRC)
Response Time: 8/10 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 17 pcs EEFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V