Recapping a Macintosh LC 475 that has no sound



Old electronic devices with electrolytic capacitors are often affected by capacitor leakage.

This Macintosh LC 475 has no sound – a common symptom of leaky capacitors. Here is a brief tutorial describing the process of replacing old, damaged capacitors in a Macintosh LC 475 logic board.

IMPORTANT ADDENDUM!
I plugged in some headphones and the sound was fine, which indicated that the sound chip was okay. That left three probable options: the audio amplifier, the speaker or the switch that deactivates the speaker when headphones are connected. I tested the speaker, which turned out to be okay, so I decided to replace the mono amplifier IC at U32, and that fixed the problem!

Recapping guide:

Macintosh LC475 & Quadra 605

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Mourad ELGORMA

Fondateur de summarynetworks, passionné des nouvelles technologies et des métiers de Réseautique , Master en réseaux et système de télécommunications. ,j’ai affaire à Pascal, Delphi, Java, MATLAB, php …Connaissance du protocole TCP / IP, des applications Ethernet, des WLAN …Planification, installation et dépannage de problèmes de réseau informatique……Installez, configurez et dépannez les périphériques Cisco IOS. Surveillez les performances du réseau et isolez les défaillances du réseau. VLANs, protocoles de routage (RIPv2, EIGRP, OSPF.)…..Manipuler des systèmes embarqués (matériel et logiciel ex: Beaglebone Black)…Linux (Ubuntu, kali, serveur Mandriva Fedora, …). Microsoft (Windows, Windows Server 2003). ……Paquet tracer, GNS3, VMware Workstation, Virtual Box, Filezilla (client / serveur), EasyPhp, serveur Wamp,Le système de gestion WORDPRESS………Installation des caméras de surveillance ( technologie hikvision DVR………..). ,

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