{"id":1725,"date":"2024-01-18T18:39:44","date_gmt":"2024-01-19T02:39:44","guid":{"rendered":"https:\/\/www.davebaar.com\/wordpress\/?p=1725"},"modified":"2024-03-09T18:44:43","modified_gmt":"2024-03-10T02:44:43","slug":"ryobi-and-skil-charger-repairs-after-overvoltage-condition","status":"publish","type":"post","link":"https:\/\/davebaar.com\/wordpress\/2024\/01\/18\/ryobi-and-skil-charger-repairs-after-overvoltage-condition\/","title":{"rendered":"Ryobi and Skil Charger Repairs After Overvoltage Condition"},"content":{"rendered":"\n

Recent repairs for a friend. 7 separate devices (6 tool battery chargers -5 Ryobi units and one Skil charger) and an oven controller were brought to me after having failed due to an extreme overvoltage condition in an off-grid cabin.<\/p>\n\n\n\n

All of the chargers are fixed now, after a significant number of fairly straightforward component replacements.<\/p>\n\n\n\n

In this case, the “defensive”, sacrificial components in the circuit designs <\/a>-mainly varistors, current fuses, and solid state thermal fuses – sort of did what they were designed to do and blew into open or shorted failure as designed, but not quickly enough to save a significant set of early stage power supply components. There were some spectacularly blown electrolytic capacitors and varistors, a fried transformer, and some failed switching ICs, but everything past the power supply stages of the circuits turned out to be OK.<\/p>\n\n\n\n

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Repaired Ryobi Fast Chargers<\/figcaption><\/figure>\n\n\n\n\n\n\n\n

The total blown parts list from this single incident is remarkable:<\/p>\n\n\n\n

9 blown capacitors -including some big ones<\/p>\n\n\n\n

5 varistors<\/p>\n\n\n\n

2 switching ICs (TOP250EN series)<\/p>\n\n\n\n

5 fuses<\/p>\n\n\n\n

one thermal breaker on a charger transformer<\/p>\n\n\n\n

a really fried transformer on the oven controller board<\/p>\n\n\n\n

All 6 chargers are fixed and working now. Still waiting for a replacement transformer for the oven controller.<\/p>\n\n\n\n

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visibly blown capacitor and varistor<\/figcaption><\/figure>\n\n\n\n
\"\"
Skil charger: this one had an open circuit thermal fuse adjacent to the primary winding that I replaced.<\/figcaption><\/figure>\n\n\n\n\n\n
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More blown capacitors -Ryobi fast charger<\/figcaption><\/figure>\n\n\n\n
\"\"
Ryobi standard speed charger adapter. These can be cracked open with e.g. a wide chisel and a hammer. Note the blown capacitor and blown varistor beside it.<\/figcaption><\/figure>\n\n\n\n
\"\"
Ryobi fast chargers, working OK post repair.<\/figcaption><\/figure>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Recent repairs for a friend. 7 separate devices (6 tool battery chargers -5 Ryobi units and one Skil charger) and an oven controller were brought to me after having failed due to an extreme overvoltage condition in an off-grid cabin. All of the chargers are fixed now, after a significant number of fairly straightforward component […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1725","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/davebaar.com\/wordpress\/wp-json\/wp\/v2\/posts\/1725","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/davebaar.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/davebaar.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/davebaar.com\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/davebaar.com\/wordpress\/wp-json\/wp\/v2\/comments?post=1725"}],"version-history":[{"count":5,"href":"https:\/\/davebaar.com\/wordpress\/wp-json\/wp\/v2\/posts\/1725\/revisions"}],"predecessor-version":[{"id":1743,"href":"https:\/\/davebaar.com\/wordpress\/wp-json\/wp\/v2\/posts\/1725\/revisions\/1743"}],"wp:attachment":[{"href":"https:\/\/davebaar.com\/wordpress\/wp-json\/wp\/v2\/media?parent=1725"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/davebaar.com\/wordpress\/wp-json\/wp\/v2\/categories?post=1725"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/davebaar.com\/wordpress\/wp-json\/wp\/v2\/tags?post=1725"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}