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![]() I have a Nikkai QM82 800W inverter (12V DC - 230V AC 50Hz) which has some severe burning and an exploded chip. It's also sold under the Skytronic brand name in the UK, and as Power-Up in Europe - I think they are all made by the same manufacturer in Taiwan. Sold recently by Maplins in the UK. Can anyone look inside one and tell me the values for: U8 (most important! This chip is destroyed!!) R45 R47 R49 R51 Q17 Q18 Q19 Q20 Any help at all would be appriciated! TIA Richard |
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On Tue, 19 Aug 2003 08:06:37 +0100, MacMan85
wrote: | | | I have a Nikkai QM82 800W inverter (12V DC - 230V AC 50Hz) which has | some severe burning and an exploded chip. It's also sold under the | Skytronic brand name in the UK, and as Power-Up in Europe - I think | they are all made by the same manufacturer in Taiwan. Sold recently by | Maplins in the UK. | | Can anyone look inside one and tell me the values for: | | U8 (most important! This chip is destroyed!!) | | R45 | R47 | R49 | R51 | Q17 | Q18 | Q19 | Q20 | | Any help at all would be appriciated! Sorry to mention this, but if an electronic device has "severe burning and an exploded chip" It is probably scrap. If you repair one bit, this will reveal another failed bit. :-((((((((( Dave Fawthrop Killfile and Anti Troll FAQs at http://www.hyphenologist.co.uk/killfile. Agent Korean Spam filter From: {å|¿|¾|®|¥|Â|À|ç|¤|¶|§|±|ª|º} or Subject: {å|¿|¾|®|¥|Â|À|ç|¤|¶|§|±|ª|º} |
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On Tue, 19 Aug 2003 08:45:59 +0100, Dave Fawthrop
wrote: On Tue, 19 Aug 2003 08:06:37 +0100, MacMan85 wrote: | | | I have a Nikkai QM82 800W inverter (12V DC - 230V AC 50Hz) which has | some severe burning and an exploded chip. It's also sold under the | Skytronic brand name in the UK, and as Power-Up in Europe - I think | they are all made by the same manufacturer in Taiwan. Sold recently by | Maplins in the UK. | | Can anyone look inside one and tell me the values for: | | U8 (most important! This chip is destroyed!!) | | R45 | R47 | R49 | R51 | Q17 | Q18 | Q19 | Q20 | | Any help at all would be appriciated! Sorry to mention this, but if an electronic device has "severe burning and an exploded chip" It is probably scrap. If you repair one bit, this will reveal another failed bit. :-((((((((( I agree, my experience of repairing switch-mode power supplies is that is that if it is more than the two main switching transistors (and associated resistors) then normally they are not worth repairing. |
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You'll spend more money fixing it than you will buying a BETTER one
that DOESN'T explode when overloaded. May I recommend TrippLite brand which is damned near indestructable and more reasonably priced than boat dealer inverters costing thousands for no reason other than greed. (Tripplite has a $50K insurance policy. If it destroys your load, they'll buy you a new one, at least in the USA) On Tue, 19 Aug 2003 08:06:37 +0100, MacMan85 wrote: I have a Nikkai QM82 800W inverter (12V DC - 230V AC 50Hz) which has some severe burning and an exploded chip. It's also sold under the Skytronic brand name in the UK, and as Power-Up in Europe - I think they are all made by the same manufacturer in Taiwan. Sold recently by Maplins in the UK. Can anyone look inside one and tell me the values for: U8 (most important! This chip is destroyed!!) R45 R47 R49 R51 Q17 Q18 Q19 Q20 Any help at all would be appriciated! TIA Richard Larry W4CSC Maybe we could get the power grid fixed if every politician regulating the power companies wasn't on their payrolls. |
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Larry Posted Snip----
You'll spend more money fixing it than you will buying a BETTER one that DOESN'T explode when overloaded. May I recommend ----End Snip And I thouroughly recommend the hint hint in Gripper's post The detail in OP suggests experience, though experience would suggest that SMPSU in the state reported would most likely not be worth the time expense and effort required Good luck either way Jimbo -- remove jukebox to reply http://www.witzend.org.uk http://www.by-users.co.uk http://www.by-user.co.uk |
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If you want a replacement try A.R.D. electronics..they offer a 1000w
inverter for £ 100.00 Runs my fridge a treat despite all this hot weather ! http://www.ardelectronics.com/ Steve "Jimbo" wrote in message ... Larry Posted Snip---- You'll spend more money fixing it than you will buying a BETTER one that DOESN'T explode when overloaded. May I recommend ----End Snip And I thouroughly recommend the hint hint in Gripper's post The detail in OP suggests experience, though experience would suggest that SMPSU in the state reported would most likely not be worth the time expense and effort required Good luck either way Jimbo -- remove jukebox to reply http://www.witzend.org.uk http://www.by-users.co.uk http://www.by-user.co.uk |
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su4704 Posted Snip----
If you want a replacement try A.R.D. electronics..they offer a 1000w inverter for £ 100.00 Runs my fridge a treat despite all this hot weather ! http://www.ardelectronics.com/ ----End Snip Pardon???? Jimbo -- remove jukebox to reply http://www.witzend.org.uk http://www.by-users.co.uk http://www.by-user.co.uk |
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On Tue, 19 Aug 2003 20:34:21 GMT, "Jimbo"
wrote: Larry Posted Snip---- You'll spend more money fixing it than you will buying a BETTER one that DOESN'T explode when overloaded. May I recommend ----End Snip And I thouroughly recommend the hint hint in Gripper's post The detail in OP suggests experience, though experience would suggest that SMPSU in the state reported would most likely not be worth the time expense and effort required Good luck either way Jimbo Thanks, Neil, for the info - most useful. To the people who suggested, rightly, that it might be more trouble to fix than it's worth, you are right - if I was only interested in getting a working inverter. As an electronics engineer who's been designing SMPS for 30 years, I'm interested in this one because of the extent of the failure, and the failure analysis is every bit as interesting as getting the beast working again. It's very rare for a failed SMPS to destroy quite so many components - and the original failure in this one appears to be a blown electolytic in the 12V regulated supply, which seems to have short-circuited a 7812 linear regulator and allowed a catastophically high voltage into the output driver oscillator. Very interesting is the fact that it hasn't blown any of the input fuses! As an educational excercise, it's fascinating! Regards, Richard |
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On Wed, 20 Aug 2003 14:55:00 +0100, MacMan85
wrote: On Tue, 19 Aug 2003 20:34:21 GMT, "Jimbo" wrote: Larry Posted Snip---- You'll spend more money fixing it than you will buying a BETTER one that DOESN'T explode when overloaded. May I recommend ----End Snip And I thouroughly recommend the hint hint in Gripper's post The detail in OP suggests experience, though experience would suggest that SMPSU in the state reported would most likely not be worth the time expense and effort required Good luck either way Jimbo Thanks, Neil, for the info - most useful. To the people who suggested, rightly, that it might be more trouble to fix than it's worth, you are right - if I was only interested in getting a working inverter. As an electronics engineer who's been designing SMPS for 30 years, I'm interested in this one because of the extent of the failure, and the failure analysis is every bit as interesting as getting the beast working again. It's very rare for a failed SMPS to destroy quite so many components - and the original failure in this one appears to be a blown electolytic in the 12V regulated supply, which seems to have short-circuited a 7812 linear regulator and allowed a catastophically high voltage into the output driver oscillator. Very interesting is the fact that it hasn't blown any of the input fuses! As an educational excercise, it's fascinating! Regards, Richard My experience of SMPSU's is that the Switching Transistors Gallantly lay down their lives in an attempt to save the Fuse, bless them. In this case it sounds like its taken out the Tranny as well, hands up all those who have taken out a Tranny? |
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