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?
-
-
Re: Pioneer VSX- Shutdown after 1 minute- SMPS problem
It 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. -
Re: Pioneer VSX- Shutdown after 1 minute- SMPS problem
I replaced TOP258 with new one, now everything fine no over heating no shurdown.
Comment
-
Re: Pioneer VSX- Shutdown after 1 minute- SMPS problem
Dont forget to check the caps around for high ESR to prevent the TOP from blowing again.Comment
-
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=24809Comment
-
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=24809Comment
-
I have two such machines which is having this issue. After shutdown the system starts on its own in a minute. It does not start immediately. It takes around 20-40 seconds before it starts again on its own. This is driving me crazy and not sure where to start ..
Some very important points :
- Laptop does not auto starts after shutdown if adapter is connected.
- It will only auto start after shutdown if the laptop is in BATTERY only mode.
- I have tried replacing batteries with a known
- if I shutdown the laptop with adapter connected and lets say remove the adapter after 5-10
-
I was trying to reset the Pulse Meter and re-adjust the Panel-1/2 settings in the SM on an exceptionally old Pioneer LX5090 (51k power-on hours according to it's SM). I did this many times on much less aged specimens (with 10-20k hours) without issues. After following the usual workflow, I noticed the darkest gray shade showed up black with bright sparkles. I tried to adjust some other parameters but it didn't disappear. Then I went on and restored the old values of the parameters I don't usually touch (although I did this from memory, so I might have made an error). After that, I started going...03-26-2023, 11:20 AM -
Just as the title says, I have an ASUS X75VD-TY237H, MB model X75VD - soldered on i3-2370M + 4GB DDR3 RAM.
The laptop works almost fine except for two issues:
1. It will shut down at exactly 50 minutes. Not a soft shutdown, but just like somebody pulled the plug on it (battery does hold charge). It just goes off, as if Intel's stupid HPET kicks in. The thing is, I very highly doubt the ME is at fault - if it was ME, it would shut down at exactly 30 minutes after power on - I've had a Samsung NP300E5C do this because its chipset (HM70 for Samsung) would not support... -
This relic from a technology path that came to a dead end (but still has historical interest) was brought in with a dead SMPS, which is based around a MK1210 device. I got it going after a battle. It seems to have a strange design - if it's not getting feedback that the secondary is OK it cause the big FET to go into full conduction and overloads resulting in a blown fuse at best or something worse! I'm using a Dim Bulb Tester (70W/230V) which thankfully has saved the day a number of times whilst repairing.
Now, it loads a CD OK. The motor voltage output (which is built onto the SMPS... -
Hi all, I just need to know that, can i use SMPS type power supply to test and short circuit detection on a laptop motherboard?
I saw 95% of repair guys are using only Linear bench power supply. linear bench power supply is pricy, thats why i planned to get one SMPS supply.
i know that in linear power supply the noise will be very low comparing to SMPS supply....
Comment