68kMLA Classic Interface

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Quadra 950 sound chip

Posted by: julys on 2024-08-13 14:33:27 Hello! This chip exploded on my Quadra 950 logic board and there is no more sound through the built in speaker. Stereo audio through jack works. Anyone knows what is the type of the chip? The explosion damaged the marking on the chip. Thx!

Posted by: nyef on 2024-08-13 15:08:44 I don't have a board to examine, but based on the photo you've shown I can see that it's a Philips part, in that particular in-line package that suggests a need for good thermal dissipation (thus, power handling capacity). It's in the speaker path, so probably an audio amp, and then there's the remains of the marking, ending in either 856 or 056. Some quick digging suggests that it's probably a TDA7056 "3 W mono BTL audio output amplifier", which is specifically noted for being able to drive an 8-ohm speaker at 1 watt with a 6v supply and no heatsink.

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