Technical description and composition of the LG 15LC1RB TV, panel type and applicable modules. The composition of the modules.LG
Model: 15LC1RB ZG
Chassis / Version: CL-81
Panel: LC150X02 (TL) (01)
Lamp backlight: 4 Lamp CCFL
T-CON: 6870S-0215D (TL) (01)
Inverter (backlight): integrated into PSU
PWM Inverter: OZL68GN
MOSFET Inverter: APM4548A
Power Supply (PSU): 68709D0011A REV: 1.0
PWM Power: ICE3BS02
MainBoard: 68709M0005K
IC MainBoard: TDA15521E \ N1, 24C32, TPA3005D2
Tuner: TAEW-G053P 6700VS0003H
Control: IR: 68709S0112B
Specifications 15LC1R
LG 15LC1RB
General recommendations for repairing TV LCD
Possible manifestations of defects
- The LG 15LC1RB TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light up and do not blink.
Most often, with such manifestations, the main power module 68709D0011A is found to be faulty. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, it is necessary to check the serviceability of power switches and rectifier diodes for possible breakdown (short circuit).
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a 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. 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), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned 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 to the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. 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 turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the EAX31483004 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements TDA15521E \ N1. BGA chip malfunctions are usually easy to detect by warming up.
The malfunction of the TAEW-G053P 6700VS0003H tuner is established after checking the software and all the supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
We recommend the owners of the 15LC1RB 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!
Service manual and schematic diagram ------------------> LG 15LC1RB Chassis СL-81
The appearance of MainBoard 68709M0005K is shown in the figure below:68709M0005K
Main features of the device LG 15LC1RB:
Installed matrix (LCD panel) LC150X02 (TL) (01).
The matrix control uses the Timing Controller (T-CON) 6870S-0215D.
To power the backlight, a converter is used, combined with a power supply, controlled by the OZL68GN PWM controller. As power elements of the inverter, keys of the APM4548A type are used.
The necessary supply voltages for all nodes of the LG 15LC1RB TV are generated by the power supply module 68709D0011A, or its analogs using ICE3BS02 microcircuits.
MainBoard - the main board (motherboard) is a 68709M0005K module, using TDA15521E \ N1, 24C32, TPA3005D2, and others.
Tuner TAEW-G053P 6700VS0003H provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC150X02-TL01
Type: a-Si TFT-LCD, Panel
Diagonal size: 15.0 inch
Resolution: 1024x768, XGA
Display Mode: TN, Normally White, Transmissive
Active Area: 304.128x228.096 mm
Surface: Antiglare (Haze 13%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 500: 1
Display Colors: 16.2M (6-bit + FRC)
Response Time: 5/11 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 20 pins
Voltage: 5.0V