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2014 Accord Sport SQ Build keep_hope_alive
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<blockquote data-quote="keep_hope_alive" data-source="post: 8411569" data-attributes="member: 576029"><p>Just tapping the pins wasn't consistent and the HU circuitry didn't like the parallel connections. It was randomly muting output. So I removed the IC to also get a confirmation of the chip used.</p><p></p><p><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/2014%20Accord%20Sport/2014AccordHeadUnitMod/20150705_160604.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>This is the actual IC</p><p></p><p><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/2014%20Accord%20Sport/2014AccordHeadUnitMod/STI_TDA7851F_Datasheet.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>I removed the IC pins and decided to solder the RCA stranded wires directly to the board</p><p></p><p><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/2014%20Accord%20Sport/2014AccordHeadUnitMod/20150705_165713.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/2014%20Accord%20Sport/2014AccordHeadUnitMod/20150705_180333.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>I changed the location of the RCA jacks which fit much better</p><p></p><p><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/2014%20Accord%20Sport/2014AccordHeadUnitMod/20150705_181847.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i38.photobucket.com/albums/e128/phat_funky_beats/2014%20Accord%20Sport/2014AccordHeadUnitMod/20150705_182559.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>works great. I didn't get the channel assignments correct. This is the channel assignment</p><p></p><p>IN1 = Front Right</p><p></p><p>IN2 = Front Left</p><p></p><p>IN3 = Rear Left</p><p></p><p>IN4 = Rear Right</p><p></p><p>This surprises me because the circuit layout wasn't symmetric, was completely different than the similar IC I suspected, and i expected an attenuated rear with the front channels having the parallel inputs as seen on the board.</p><p></p><p>The good news is that both front and rear outputs sound the same. I observed bass roll-off in the output compared to my 9887 but it sounded MUCH better than the speaker outputs. Volume 39 of 40 had no clipping and sounded great - a signal level that matched the AUX input on my HU.</p></blockquote><p></p>
[QUOTE="keep_hope_alive, post: 8411569, member: 576029"] Just tapping the pins wasn't consistent and the HU circuitry didn't like the parallel connections. It was randomly muting output. So I removed the IC to also get a confirmation of the chip used. [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/2014%20Accord%20Sport/2014AccordHeadUnitMod/20150705_160604.jpg[/IMG] This is the actual IC [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/2014%20Accord%20Sport/2014AccordHeadUnitMod/STI_TDA7851F_Datasheet.png[/IMG] I removed the IC pins and decided to solder the RCA stranded wires directly to the board [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/2014%20Accord%20Sport/2014AccordHeadUnitMod/20150705_165713.jpg[/IMG] [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/2014%20Accord%20Sport/2014AccordHeadUnitMod/20150705_180333.jpg[/IMG] I changed the location of the RCA jacks which fit much better [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/2014%20Accord%20Sport/2014AccordHeadUnitMod/20150705_181847.jpg[/IMG] [IMG]http://i38.photobucket.com/albums/e128/phat_funky_beats/2014%20Accord%20Sport/2014AccordHeadUnitMod/20150705_182559.jpg[/IMG] works great. I didn't get the channel assignments correct. This is the channel assignment IN1 = Front Right IN2 = Front Left IN3 = Rear Left IN4 = Rear Right This surprises me because the circuit layout wasn't symmetric, was completely different than the similar IC I suspected, and i expected an attenuated rear with the front channels having the parallel inputs as seen on the board. The good news is that both front and rear outputs sound the same. I observed bass roll-off in the output compared to my 9887 but it sounded MUCH better than the speaker outputs. Volume 39 of 40 had no clipping and sounded great - a signal level that matched the AUX input on my HU. [/QUOTE]
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