Laptop Repair Question(Volt Converter Numbers) , can't post in repair forum. - Page 1
Forum section: electronics / beginners

author: tehmagicsmoke
author_rank: Contributor
timestamp: October 21, 2015, 07:03:09 am
content: I am working on several laptops. The current one is a dell inspiring e1705. I'm having trouble finding manuals for my laptops. But my main question is: I found one part that let the magic smoke out its a 8pin Fairchild a67an-second line-fds-third line-6690as. I can't find the same exact numbers, I have found the with the first line: paadb, and pkxay. I assume they are the same just different generations, but will still work, is this correct?

author: Rasz
author_rank: Super Contributor
timestamp: October 21, 2015, 07:16:02 am
content: its just a fet switch

author: amyk
author_rank: Super Contributor
timestamp: October 21, 2015, 08:12:16 am
content: https://www.fairchildsemi.com/datasheets/fd/fds6690as.pdfYou can buy them here:http://www.digikey.com/product-detail/en/FDS6690AS/FDS6690ASCT-ND/3042578

author: tehmagicsmoke
author_rank: Contributor
timestamp: October 21, 2015, 08:42:38 pm
content: Yah, fet switch, that's what I meant... ok, I admit I'm a bit of a noob.But am I correct in assuming it is just the newer number, improved design replacing an older obsolete design?In my spare parts I have a csi 18-second line-24wc0(I think it's 0 and not o any way to know without googling?)2wi-third line-0552c, and a atmel 422-second line-24c16an-third line-si27 a. I'm going to do some googling, but I assume these will not work as a substitute. One is out of a kitchen scale and one is from a wireless phone.Thank you for bothering to reply, good help is hard to find on the series of tubes.

author: Rasz
author_rank: Super Contributor
timestamp: October 21, 2015, 09:07:53 pm
content: Quote from: tehmagicsmoke on October 21, 2015, 08:42:38 pmuh oh, you need to replace it with same model or direct counterpart, not some random garbage pulled from home appliance just because it has the same packagepieces you mention are serial epromssecond thing is repairing is not blindly replacing components, you need to figure out what led to burning of this fet, is there a short behind it? was the board water damaged? otherwise it will again burn as soon as you power it up

author: tehmagicsmoke
author_rank: Contributor
timestamp: October 22, 2015, 12:42:34 am
content: Yah it was very water damaged, the outside looked clean, but the inside looked like hurricane Katrina got inside. I am pretty sure that there are other things burnt out since no lights come on. The burnt chip looks like it's on a graphics card module, which I've never seen in a laptop, but the laptop is made for video and media.Ive looked on fairchild site and others to see if the number i have is just obsolete, and since I haven't gotten a specific response I will ask fairchild before I order.Thanks again guys.

author: amyk
author_rank: Super Contributor
timestamp: October 22, 2015, 03:52:33 am
content: QuoteWhat are you waiting for? Just order one. If you can still buy them and there is nothing about them discontinuing or NRND'ing the part, assume that they're still in production.

author: tehmagicsmoke
author_rank: Contributor
timestamp: October 22, 2015, 04:43:02 am
content: Thanks amyk and rasz. I saw your Google tip to use "schematic" in the search. I'm sure I will put that tip to good use repairing about 10 laptops I have.The thing I'm waiting for is to stop being a cheapskate. I don't want to pay for shipping.I'll be starting work soon and working on other laptops while I look for what failed before that part, and is keeping bios from booting, maybe it's dos, I think it's an xp.Thank again.

author: Rasz
author_rank: Super Contributor
timestamp: October 22, 2015, 10:30:38 am
content: Quote from: tehmagicsmoke on October 22, 2015, 12:42:34 amdo you have ultrasonic cleaner? decent ones are ~$600

author: tehmagicsmoke
author_rank: Contributor
timestamp: October 23, 2015, 03:57:52 am
content: I used water to spray it clean and the used 91%OH and a toothbrush.Shizz, for that price I'll just eat the f***in' pcb and laptop. Still tracing the source of the power issue.Thanks, have a good drunken night guys, yesterday was muh birfday. I'm celebrating with some MarcStevens.net and Christopher Cantwell.