This service manual of the old video cassette recorder VT-LC50EM is very good readable even the tiniest numbers (i.e. IC-pins). The circuits are very clear. Many details of the schematic are very good described but in GERMAN language. Many schematic details - but complete at all. Common background information of several details are enclosed and physical knowledge of the TFT liquid crystal display for example. The manual lacks PCB drawings. If you understand german I would recommend this manual for you.
Text excerpt from page 51 (click to view)
KX-TG8231B/KX-TG8232B/KX-TGA820B
9.5.
9.5.1.
How to Replace the LLP (Leadless Leadframe Package) IC
Preparation
� PbF (: Pb free) Solder � Soldering Iron Tip Temperature of 700°F ± 20°F (370°C ± 10°C) Note: We recommend a 30 to 40 Watt soldering iron. An expert may be able to use a 60 to 80 Watt iron where someone with less experience could overheat and damage the PCB foil. � Hot Air Desoldering Tool Temperature: 608°F ± 68°F (320°C ± 20°C)
9.5.2.
Caution
� To replace the IC efficiently, choose the right sized nozzle of the hot air desoldering tool that matches the IC package. � Be careful about the temperature of the hot air desoldering tool not to damage the PCB and/or IC.
9.5.3.
How to Remove the IC
1. Heat the IC with a hot air desoldering tool through the P. C. board.
2. Pick up the IC with tweezers, etc. when the solder is melted completely. Note: � Be careful not to touch the peripheral parts with tweezers, etc. They are unstable.
When it is hard to melt the solder completely, heat it with a hot air desoldering tool through the IC besides through the P. C. board.
3. After removing the IC, clean the P. C. board of residual solder.
