Must pin connections be robust for a sensor to work even if power light is on?

Published: 12/01/2019
Must pin connections be robust for a sensor to work even if power light is on?
Source: RASPBERRYPI.STACKEXCHANGE.COM

Not really an electronics hobbyist but the title says it all. Working with a few sensors found some easy others difficult. Currently have an MFRC522 RFID sensor with the power light on (can I presume that all wiring must be correct for this to even occur?). However read/write programs produce either errors or stall. Wondering if soldering might solve issue. TIA

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