GoKawiilTektronix TDS7104 scope revived after CMOS battery failure
A hobbyist purchased a Tektronix TDS7104, a 1 GHz, 4-channel oscilloscope from the early 2000s, at a Silicon Valley flea market for $300 after negotiating down from $700. The unit initially powered on and ran fine, but hours later it failed to boot properly, throwing a CMOS battery error at the BIOS screen. The author documents the process of diagnosing and repairing the aging instrument to restore full functionality.
GoKawiil's interpretation of the reporting above, not reported fact.
High-end legacy test equipment like the TDS7104 still outperforms many modern budget oscilloscopes in bandwidth and sample rate, making refurbishment projects appealing to engineers and hobbyists on a budget. Cases like this highlight common failure points in decades-old lab gear, such as dying CMOS batteries and embedded Windows systems, that buyers should anticipate before purchasing used equipment.
- The Tektronix TDS7104 offers 1 GHz bandwidth and up to 10 Gs/s sampling, exceeding many current hobbyist scopes.
- A dead CMOS battery caused a boot failure hours after the scope initially worked fine.
- The scope runs on Windows 2000 Pro Embedded and uses standard BNC connectors, unlike costlier Tektronix-specific models.
Panasonic CR2032 Lithium Coin Batteries — The classic dead-CMOS-battery BIOS error that stalled this TDS7104 is fixed with one of these coin cells, and every PC-based bench instrument eventually needs one. Keeping a fresh multipack of Panasonic CR2032s in the drawer means your next flea-market find boots on the first try.
See Panasonic CR2032 Lithium Coin Batteries on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: tomverbeure.github.io — Electronics Etc..., 2026-09-01
Published there as: “Refurbishing a Tektronix TDS7104 Oscilloscope”
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