Technical description and composition of the LG 42LE2R TV, type of panel and applicable modules. The composition of the modules.LG
Model: 42LE2R 42LE2R-ZJ.BRULLJN
Chassis / Version: LP61A
Panel: LC420W02 (SL) (A2)
T-CON: 6870C-0100A LC420W02-SLA2 / SLC2
Inverter (backlight): 6632L-0326B, 6632L-0327B (LGIT / YPNL-T024E 2300KFG073C-F)
Power Supply (PSU): 6709900017A YP4201
PWM Power: ICE1PCS02 (PFC), DM0565R
MOSFET Power: W26NM60 (PFC)
MainBoard: LP61A EBU33925301 PP61A / C LP61A / C PN61A / LN61A
IC MainBoard: VCT6973G, TPA3100D2PHPR, TEA6420D, AT24C32AN, ICL3232CBNZ
Tuner: TAFM-W103
Specifications 42LE2R
LG 42LE2R
General recommendations for repairing TV LCD
Possible malfunctions
- LG 42LE2R 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.
With such manifestations, the power module 6709900017A usually fails. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches (W26NM60 (PFC)) and rectifier diodes for a probable short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
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) ICE1PCS02 (PFC), in the absence of external damage and a short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
Sometimes, for diagnostic purposes, inverter protection must be disabled. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the LP61A 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 board - VCT6973G, TPA3100D2PHPR, TEA6420D, AT24C32AN, ICL3232CBNZ. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
Before changing the tuner TAFM-W103, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
For owners of 42LE2R TVs, we recommend that you contact qualified personnel with the necessary work experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
schematic diagram ------------> LG CHASSIS: LP61A, FACTORY MODEL: 42LE2R-ZJ
The appearance of the MainBoard LP61A is shown in the figure below:LP61A
The appearance of the power supply
Main features of the device LG 42LE2R:
Installed matrix (LCD panel) LC420W02 (SL) (A2).
The matrix control uses the Timing Controller (T-CON) 6870C-0100A.
To power the backlight used inverter 6632L-0326B.
The necessary supply voltages for all nodes of the LG 42LE2R TV are generated by the power module 6709900017A, or its analogs using ICE1PCS02 (PFC), DM0565R microchips and W26NM60 (PFC) type power switches.
MainBoard - the main board (motherboard) is an LP61A module, using VCT6973G, TPA3100D2PHPR, TEA6420D, AT24C32AN, ICL3232CBNZ and others.
The TAFM-W103 tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC420W02-SLA2
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 930.25x523.01 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit)
Response Time: 8/10 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 20 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V