Vanquish CMH lighting system Controller Board

[Gadjet]

Ok so let me run you through the chain of events, the controller stop coming on no video, after checking the board they were lots of shorts on the board. I removed the screen a couple disappeared, then I removed the cpu and more disappeared, lastly I removed the memory chip and all shorts were gone. (The 2 chips circled in red are the memory and cpu) Also there is an issue with the 5v test point that is circled it’s reading 12v and so is a 3.3v regulator next the power jack.

Ordered a new CPU and Memory chip and installed them, reconnected the screen and all shorts are gone. Reconnected the power to check the 5v point and 3.3 regulator and the chip you see in the picture started smoking. Now my issue is what is that chip “CA7 TL” ( the Amazon screen shot is the regulator that’s next to it that was read 12v)

All help is Appreciated, Thanks

[truclacicr]

https://www.mouser.com/datasheet/2/3...08-3223887.pdf

[harp]

Now my issue is what is that chip “CA7 TL”.................. SY7208

[Gadjet]

Thanks, harp sucks Mouser has them markered as obsolete I just got the CPU and Memory from there. @truclacicr Thanks for a place where I can purchase it another 2 wks is going to suck as well. Got another question either of you have an idea of why it went up in smoke I was able to plug it up no problem before replacing the 2 chips. Was it the 3.3 regulator?

[lotas]

If you replace everything, then it won’t turn on exactly, since the STM32f429... controller has firmware and without programming the required firmware, nothing will start.

[harp]

after checking the board they were lots of shorts on the board. I removed the screen a couple disappeared, then I removed the cpu and more disappeared, lastly I removed the memory chip and all shorts were gone........... can you describe how that your "shorts lots of" look like? How you determine its location? I feel that you desoldered maybe good ic that had parallel connection with short. After dicsonnected screen, have you checked on connector of screen, and on board connector have discover reading short on power rail? The same on desoldered ICs. Low ohms reading not always represent short, or short can be still elsewhere on board............. Also there is an issue with the 5v test point that is circled it's reading 12v ........... if the 5v rail has 12v on it, when you power up device in that conditiion you fry everithing on that rail and maybe on other lower rails feeded by "5v". You must be sure that all voltages are ok before replacing anything, and after you replacing and before powering up, make sure that all power rails have expected resistance (and changed to better regard to past reading), because in the proces may create short (solder bridge, nocked, dislocated component or caps shorted from heatgun)............ I am sorry for the mess, from recently I cant quote properly... https://www.badcaps.net/forum/genera...28#post3474728

[Gadjet]

lotas ok that's not good, I'll double-check the old CPU with the new memory and update the post.

[stj]

what resistance do you consider a "short"?
and did you check both polarities?

[CapLeaker]

You have full power of the input of the voltage regulator on its output pin?