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Remember that this guide is a complete teardown of the Nintendo DS Lite. Depending upon what you’re up to, you can get by with following only a portion of the steps outlined. This teardown covers everything I’ve done to repair somewhere around 100-200 DS Lites in terms of disassembly. I do not cover mainboard component removal, but you can learn about this by searching for user john_gotts on Instagram. You can see how I fix DS Lite mainboards, and how I fix other consoles such as the DSi and 3DS lines.
It is true that you can remove the mainboard, lower screen, digitizer, and screen cover as one assembly. If there is nothing wrong with this assembly, then I recommend doing that. However, you should be comfortable with removing the flex cables on the DS Lite. As illustrated, use the smallest flat head bit you can find and be very gentle and you will have no problems. This is a good skill to acquire if you want to tackle other Nintendo handheld consoles.
I've worked on about 250 DS Lites and I've never had this issue. I recommend that you introduce as few foreign objects as possible or else the screen may not seat properly. [I have never blown a fuse, in fact, though I've repaired a few dozen of them.]