Official service manuals are typically reserved for authorized technicians, but several reputable archives host these documents for personal repair use: Elektrotanya
Always disconnect the AC power cord before handling the power supply unit (SMPS). The primary filter capacitor can store dangerous voltages exceeding 400V DC for several minutes after the TV has been unplugged. Use a dedicated capacitor discharge tool before touching any components on the primary side. lg lj7 chassis service manual
Identify the chip location using the schematic map in the manual. lg lj7 chassis service manual
Master Guide to the LG LJ7 Chassis Service Manual: Repair, Schematics, and Troubleshooting lg lj7 chassis service manual