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Accounts are free. Join #retro on irc.fxnet.org, identify with NickServ and type !req. #retro on irc.fxnet.org 6697 ssl · 6667 plain modern + vintage clients welcome 3 people in #retro okawari, synmuffin, thelounge56 nobody on the FTP last upload: Windows XP Dark Edition v7 Rebi... by archiveorg, 3h ago as of 18:56 EDT · releases 2,002 last 24h +236 online 514.7 GB library 1.2 TB members 0 updated 2026-10-05 18:56 Device Electronics Skills Difficulty Easy Time 15 minutes Steps 3 This guide is by Carlos López (España - Spain) on iFixit and is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0. ByteRot mirrors it for non-commercial preservation: formatting changed and photos resized for old browsers; full-size photos and the text are on the FTP in /DOCS/REPAIR. Original guide >> • Some notes on Schottky diodes, or high-frequency diodes, or fast switching diodes, which are widely used in switched-mode power supplies. When these diodes fail, they short-circuit, causing the power supply to stop oscillating and making the device appear dead. This is the first thing to check in switched-mode power supplies, as it is a very common fault. • It has already happened to me with several devices where a diode failure left the unit dead, for example: • Photo 2: CREATE MILK FROTHER STUDIO milk frother, does not turn on, Schottky diode fault. (https://es.ifixit.com/Gu%C3%ADa/Espumador+de+leche+-+CREATE+MILK+FROTHER+STUDIO+No+enciende+aver%C3%ADa+diodo+Shotkky./196452) • PANASONIC Inverter NN-SD28HS microwave - Dead, no power, switched-mode power supply Schottky diode fault. (https://es.ifixit.com/Gu%C3%ADa/Microondas+PANASONIC+Inverter+NN-SD28HS+-+Apagado+Muerto+aver%C3%ADa+de+diodo+schottky+de+la+fuente+conmutada./205460) • Photo 3: Repair of electronic module DA1-B5780116000 for EQUATION dehumidifier, Type: YL-2A15BT, does not turn on. (https://es.ifixit.com/Gu%C3%ADa/Reparaci%C3%B3n+m%C3%B3dulo+electr%C3%B3nico+DA1-B5780116000++deshumidificador+EQUATION+Type:+YL-2A15BT+no+enciende./169027) • Measurement of a Schottky diode IN GOOD CONDITION, OK, properly biased: Negative - Cathode / Positive - Anode. In these diodes, you will find that the measurement provided by the multimeter in ohms is lower than in other diodes; THE FORWARD VOLTAGE DROP is from 0.2 to 0.348 Volts (Even though we are using the ohms scale). • When reverse-biased, it behaves like any diode; it DOES NOT conduct electricity. • A faulty Schottky diode will show a resistance of 0 ohms or very close to it, a "short circuit" in both forward and reverse bias. Therefore, it is relatively simple to locate. • Schottky diodes are very useful, for example, as reverse-polarity protection diodes in devices. In the following document, I use them with an IKEA alarm clock that has 2 batteries in parallel to prevent sulfation. • DEKAD Alarm Clock - IKEA battery holder sulfated - Modification and improvement to prevent the problem. (https://es.ifixit.com/Gu%C3%ADa/Reloj+Despertador+DEKAD+-+Ikea++Portapilas+sulfatado-+Modificaci%C3%B3n+y+mejora+que+evita+el+problema./164142) • Explanatory video, measuring rectifier diodes; the methodology for Schottky diodes is the same. (https://www.youtube.com/watch?v=RAi7ALM8C8E) • End of Guide. This guide is by Carlos López (España - Spain) on iFixit and is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0. ByteRot mirrors it for non-commercial preservation: formatting changed and photos resized for old browsers; full-size photos and the text are on the FTP in /DOCS/REPAIR. Original guide >>

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