Hi, I got pioneer VSX 1122 recently, it keeping power problem after a while power when i check inside i found that TOP258 ic is the root cause its overheating and causing shutdown the SMPS, i just checked the data sheet of TOP258, ther its clearly mention about thermal protection, i dont know what causing TOP258 overheat , is it because internal fault of top258?
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Pioneer VSX- Shutdown after 1 minute- SMPS problem
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Re: Pioneer VSX- Shutdown after 1 minute- SMPS problem
Originally posted by rievax_60 View PostIt can be a fault with the TOP258. I have seen this many times with Power-Integration SMPS ICs. Or there might be high ripple on the secondary rail because of high capacitor ESR.
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Re: Pioneer VSX- Shutdown after 1 minute- SMPS problem
Always inspect the snubber circuit too.
https://www.badcaps.net/forum/showthread.php?t=64602Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Re: Pioneer VSX- Shutdown after 1 minute- SMPS problem
Originally posted by budm View PostAlways inspect the snubber circuit too.
https://www.badcaps.net/forum/showthread.php?t=64602
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Re: Pioneer VSX- Shutdown after 1 minute- SMPS problem
Just download the specsheet of the IC:
https://cdn.badcaps-static.com/pdfs/...1193a9ddeb.pdf
Look at Application Examples and read about the Clamping network.
Also study more here:
https://www.eetimes.com/author.asp?doc_id=1280601
https://www.maximintegrated.com/en/a...dex.mvp/id/848
https://www.digikey.com/en/articles/...power-switchesLast edited by budm; 10-10-2017, 10:46 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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