Menu
Forum
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Car Audio Discussion
General Car Audio
Car Audio Build Logs
Car Audio Equipment
Subwoofers
Speakers
Amplifiers
Head Units
Car Audio Help
Wiring, Electrical and Installation
Enclosure Design & Construction
Car Audio Classifieds
Car Audio Classifieds
Car Audio Wanted
Classifieds Member Feedback
Gallery
New media
New comments
Search media
SHOP
Shop Head Units
Shop Amplifiers
Shop Speakers
Shop Subwoofers
Shop eBay Car Audio
Test
Forum
Search
Search titles only
Search titles only
Log in / Join
Search
Search titles only
Search titles only
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Menu
Reply to thread
Forum
Car Audio Equipment
Amplifiers
What's wrong with this amp? PICS inside
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="shizzzon" data-source="post: 6159947" data-attributes="member: 590338"><p>Here is the situation, amp is irrelevant, here is the scene-</p><p></p><p>Stock alternator, car on, over 14v at idle, starting battery up front, XS D3100 batt in the back(reads 13.0 float), so i gots plenty of battery power for this amp which requires a 200A fuse.</p><p></p><p>I start to oscope the amp on a 48hz tone set to repeat.</p><p></p><p>Every now and then, there would be a "THUD" sound that would quickly come from the amp. Unknown as to why but we continue to scope anyway. I do not know if it's relevant or not.</p><p></p><p>Anyways, subsonic set to off, LPF set all the way up, bass boost OFF, phase 0, gain - all the way DOWN.</p><p></p><p>All settings on HU were flat, sub preout set to 15, Kenwood HU. Volume goes to 35.</p><p></p><p>I start the scoping process-</p><p></p><p>I want the user to reach a volume of 27 before i start turning up the gain.</p><p></p><p>Once he reaches approximately volume 20-22, this amp audibly appears to be outputting some decent serious power considering the gain is all the way down!</p><p></p><p>Once the volume is adjusted just a couple more notches, not even reaching 27 yet, here is what i know-</p><p></p><p>Voltage output on speaker leads- 28.5-28.7v (rated at 1.8kw@1ohm so not all the way there yet)</p><p></p><p>Sine wave on scope was still 100% clean.</p><p></p><p>immediately there was a "click" inside the amp as if something was switching then immediately smoke poured out the speaker wire\power\ground side.</p><p></p><p>The amp was extremely hot on the power\ground side.</p><p></p><p>Amp was taken apart and here are the pics-</p><p></p><p>Before i show pics, there was a chip that was cracked with model number - KIA494AP = Korea Voltage Mode PWM module Controller is what i pulled from it.</p><p></p><p>that and multiple FETs are fried, here are pics-</p><p></p><p><img src="http://i303.photobucket.com/albums/nn147/shizzzon/IMAG0086.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i303.photobucket.com/albums/nn147/shizzzon/IMAG0087.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i303.photobucket.com/albums/nn147/shizzzon/IMAG0088.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i303.photobucket.com/albums/nn147/shizzzon/IMAG0089.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i303.photobucket.com/albums/nn147/shizzzon/IMAG0091.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i303.photobucket.com/albums/nn147/shizzzon/IMAG0092.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>And of the Chip, looks like a resistor got fried too-</p><p></p><p><img src="http://i303.photobucket.com/albums/nn147/shizzzon/IMAG0090.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="shizzzon, post: 6159947, member: 590338"] Here is the situation, amp is irrelevant, here is the scene- Stock alternator, car on, over 14v at idle, starting battery up front, XS D3100 batt in the back(reads 13.0 float), so i gots plenty of battery power for this amp which requires a 200A fuse. I start to oscope the amp on a 48hz tone set to repeat. Every now and then, there would be a "THUD" sound that would quickly come from the amp. Unknown as to why but we continue to scope anyway. I do not know if it's relevant or not. Anyways, subsonic set to off, LPF set all the way up, bass boost OFF, phase 0, gain - all the way DOWN. All settings on HU were flat, sub preout set to 15, Kenwood HU. Volume goes to 35. I start the scoping process- I want the user to reach a volume of 27 before i start turning up the gain. Once he reaches approximately volume 20-22, this amp audibly appears to be outputting some decent serious power considering the gain is all the way down! Once the volume is adjusted just a couple more notches, not even reaching 27 yet, here is what i know- Voltage output on speaker leads- 28.5-28.7v (rated at 1.8kw@1ohm so not all the way there yet) Sine wave on scope was still 100% clean. immediately there was a "click" inside the amp as if something was switching then immediately smoke poured out the speaker wire\power\ground side. The amp was extremely hot on the power\ground side. Amp was taken apart and here are the pics- Before i show pics, there was a chip that was cracked with model number - KIA494AP = Korea Voltage Mode PWM module Controller is what i pulled from it. that and multiple FETs are fried, here are pics- [IMG]http://i303.photobucket.com/albums/nn147/shizzzon/IMAG0086.jpg[/IMG] [IMG]http://i303.photobucket.com/albums/nn147/shizzzon/IMAG0087.jpg[/IMG] [IMG]http://i303.photobucket.com/albums/nn147/shizzzon/IMAG0088.jpg[/IMG] [IMG]http://i303.photobucket.com/albums/nn147/shizzzon/IMAG0089.jpg[/IMG] [IMG]http://i303.photobucket.com/albums/nn147/shizzzon/IMAG0091.jpg[/IMG] [IMG]http://i303.photobucket.com/albums/nn147/shizzzon/IMAG0092.jpg[/IMG] And of the Chip, looks like a resistor got fried too- [IMG]http://i303.photobucket.com/albums/nn147/shizzzon/IMAG0090.jpg[/IMG] [/QUOTE]
Insert quotes…
Verification
Post reply
Forum
Car Audio Equipment
Amplifiers
What's wrong with this amp? PICS inside
Top
Menu
Home
Refresh