Hello
When you use SD card,some pins will be occupied,such as 10,11,12,13;and when you use TFT Shield,almost all pins will be occupied,such as 2-13.So,it’ll occur a clash while using them together,then the image drawn is just garbled lines of colors.
If you want to show picture through SD Card & TFT Shield,might you can use TFT Shield v2.0.
Best Regards
Jacket