I'm not sure if this could be related, but you have to be careful when you use Isopropyl alcohol. The reason is the most Isopropyl alcohols sold in drug stores are mixed with 30% of water. This is enough to damage some sensitive electronic parts. You have to make sure that you're using 99% of alcohol concentration. When people talk about Isopropyl alcohol in their electronic repair guide, they some times neglect to mention this extremely important detail.