Acute Gastroenteritis: This is a common condition in children, often caused by viral infections, and can be exacerbated by the ingestion of non-food items, which might have happened while playing with electronic components. The symptoms of fever, abdominal pain, and vomiting are consistent with this diagnosis.

Intestinal Obstruction: If the child ingested small parts from the electronic components, there's a risk of intestinal obstruction, which could cause severe abdominal pain and vomiting.
Food Poisoning: Although less likely given the context, if the child had access to spoiled food or contaminated water while playing, food poisoning could be a consideration.
Infectious Gastroenteritis due to other pathogens: Bacterial or parasitic infections could also cause these symptoms, especially if the child's environment or the items they played with were contaminated.

Button Battery Ingestion: If the child ingested a button battery from the electronic components, it could cause severe burns to the esophagus or intestines, leading to perforation and potentially life-threatening complications.
Heavy Metal Poisoning: Some electronic components may contain heavy metals like lead or mercury. Ingestion of these could lead to severe poisoning, which might not immediately present with typical symptoms but could have long-term devastating effects.
Septic Peritonitis: If the vomiting is a sign of a perforated viscus (due to obstruction or other causes), the child could develop septic peritonitis, a life-threatening condition requiring immediate surgical intervention.

Foreign Body Perforation: Although related to intestinal obstruction, the specific scenario where a foreign body (like a sharp object from electronic components) perforates the intestine is less common but serious.
Toxic Ingestion (other than heavy metals): Depending on what was in the box of electronic components, there could be a risk of ingesting other toxic substances, though this would be rare and highly dependent on the specific contents of the box.