I have a broken JL JX500/1D with a busted power supply. I have only taken time to identify the issue, I assume this is the driver IC for the FETS, they don't cross to any thing either. I can't cross this device M18021HN. There is a missing section of the IC that starts MPS. There a 4 power supply transistors, two are burned. Any Ideas? I have added attachment with picture.
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Hello, I have the same issue regarding identifying a replacement for this same chip, M18021. To my understanding, XXT460 (is) are the power transistors. Pls, if anybody has abled to get a cross reference to the above (IC3) I'd really appreciate it.Thanks again.
I ordered chip from http://www.mouser.com/ . I had no luck repairing this amp. It ran for a few minutes and crashed again. I put it up to revisit. I replaced with an MP18021HN. The manufacturer suggests bottom tab be soldered for proper heat dissipation and it it soldered to the board. I may have damaged chip upon installation. As I remember the opposite side of the board has transformer mounted over the IC. I would be interested in any info from anyone having made a successful repair.
Brian
Brian
Re: MP18021HN (JX500/1D)
Thanks for the reply. No wonder I could not find informations about that IC
of my own typo. I used to work as an electronic tech and performed my own rework on circuit boards. Yes, i wondered about such a high current component's underside cavity wasn't soldered at all the which it was supposed to. I looked all over the internet for this part and every authorized dealer were out of stock. Yesterday, i made contacts at Alibaba.com in China and made some orders. Im hoping that I wont get some fake-*** parts like i experienced once in Ebay from a Chinaman. From the look of the circuitry, this car amp is the the most complicated-looking thing compared to other brands that ive worked on before. Im disappointed that JL would not provide/sell me the schematics. This is why I stayed with Soundstream and Fosgates old schools stuff coz they provide free schematics.
Btw, do you have a schematic for this JX model? id like to get a copy if you dont mind. Thanks.
Thanks for the reply. No wonder I could not find informations about that IC
of my own typo. I used to work as an electronic tech and performed my own rework on circuit boards. Yes, i wondered about such a high current component's underside cavity wasn't soldered at all the which it was supposed to. I looked all over the internet for this part and every authorized dealer were out of stock. Yesterday, i made contacts at Alibaba.com in China and made some orders. Im hoping that I wont get some fake-*** parts like i experienced once in Ebay from a Chinaman. From the look of the circuitry, this car amp is the the most complicated-looking thing compared to other brands that ive worked on before. Im disappointed that JL would not provide/sell me the schematics. This is why I stayed with Soundstream and Fosgates old schools stuff coz they provide free schematics.
Btw, do you have a schematic for this JX model? id like to get a copy if you dont mind. Thanks.
Possible mod for JX500
This burning of the two power transistors can be prevented from spreading by
cutting the Drain/ or Source's pin open and install in-line fuses in between. I just remembered that they do this on Rockford Fosgates non-HD punch 45/75/150 series amps.
This burning of the two power transistors can be prevented from spreading by
cutting the Drain/ or Source's pin open and install in-line fuses in between. I just remembered that they do this on Rockford Fosgates non-HD punch 45/75/150 series amps.
I do not have a schematic for this amp, I wish I did. You can get the pin out of the IC and sketch your own. You probably recognized the basic power supply design so there's a start. Usually you can install the driver chip and transistors without the power FETs and see the signal on the scope. This doesn't work on this amp, I did replace the oscillator chip. Probably a way to force it on, but I didn't get that far.
I've got another one coming in with a bad output section, I'll have some reference at that point. This is just a hobby now, so when I get up a a half a dozen amps or so I make a little time to work on them and sometimes, one like this, gets put back until I get interested again. If I remedy it I will post what I learned.
I've got another one coming in with a bad output section, I'll have some reference at that point. This is just a hobby now, so when I get up a a half a dozen amps or so I make a little time to work on them and sometimes, one like this, gets put back until I get interested again. If I remedy it I will post what I learned.
If anyone is still monitoring this I am pretty sure I've crossed this IC out to be able to use a Texas Instruments UCC27201A Driver - it seems to be viable - attached are the two screenshots from the data sheets if anyone wants to check behind me.
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Oh ok, nice, do you know if it's the same part number or another? I'm trying to source these in the US and I was only able to find the TI driver anywhere here (Digikey) Thanks for any help
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It's a different part number and manufacturer so I don't understand the question about the part number.
The LM5101BMA is also supposed to be an equivalent and mouser is showing stock.
The LM5101BMA is also supposed to be an equivalent and mouser is showing stock.