Am having trouble finding an A6351 chip to replace the fried one in the 5VSB circuit of my ATX-300-12Z power supply. Have read previous discussions about this chip here but haven't seen mention of a source for them. Thanks.
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Re: Need A6351 I.C.
http://www.findchips.com/
finds one vendor with no stock, but give them a call to see if they can special order.Last edited by retiredcaps; 09-04-2010, 06:05 PM.--- begin sig file ---
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Re: Need A6351 I.C. for Bestec ATX-300-12Z
Chip is out of production. A couple of options-
1) buy a better newer PSU
2) buy a new 300 on ebay ($25 and up)
3) hope Everell catches this thread and has a spare from one of his "experiments"
4) Ask in the "Wanted" section for either the PSU or the chip. There may be a few hanging about under somebody's workbench...
Always try to give as much info in the thread and first post. A "chip hunter" may get passed-by, but a Bestec PSU hunter may grab more attention.
Welcome to the Forums!
Toast
EDIT: Would you please update your location in your profile. Hate to go digging up something for you only to find you're in Europe and shipping is OMG!Last edited by Toasty; 09-04-2010, 11:24 PM.veritas odium paritComment
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Re: Need A6351 I.C.
EDIT 2: Did you figure out what killed it to begin with? If so, what?veritas odium paritComment
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Re: Need A6351 I.C.
Welcome to the forum, surfwatcher. It would be helpful to know your location. Are you in the USA, or Europe, or Asia? This is a worldwide forum.
At the moment I don't have a dead Bestec to rob parts from. Once repaired they are (in my opinion) a great power supply and works well.
My suggestion: stop by some computer repair shops and ask for a dead Bestec power supply. The woods are full of them! Most people don't like them - so that is to your advantage. The Bestec ATX-250 12Z and ATX-300 12Z, as well as some of the other ATX-300 models all have that chip.
Bestec puts glue on some of the parts. The glue is yellowish, brownish, or black, depending on how much heat abuse. Get a very small screwdriver and remove ALL of it because it causes shorts and resistive paths between parts (this may be why it failed). AND replace all bulging capacitors.
I am currently working on a "throw away" Bestec ATX-250 12Z. I am modifying it to put active PFC in it. So far I have removed the mains capacitors and replaced them with the new main cap. I have wound and installed the booster coil. And I have installed the large filter cap across the bridge diode. Now I am ready to do some "cut and paste" on the circuit traces. Once I get the "big" parts installed and wired in, I will build a small breadboard for the CS1500 APFC chip. You will find numerous little projects on this forum you can do using a Bestec.Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)Comment
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Re: Need A6351 I.C.
Thanks for the input and suggestions. Will take everell's advice and try to pick up an unwanted Bestec from a repair shop.Comment
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There are some specialty tools needed to do this task. The replacement MEC1503 chips can be acquired from Aliexpress. Do not buy the bare chips as... -
Common SPI bios chip programming Questions and Answers
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Q: I have a bios request,i can`t post my backup as i can`t read from the chip.
A: If you can`t read from it how do you expect to write to it ?.
Q: Why is my bios chip unreadable ?.
A: The programmer is faulty or has a worn or broken zif socket.
The USB cable is frayed,connector pins worn or some other physical damage.
Not enough amperage or voltage to power the programmer properly.
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