I-Appliance BBS
The Official Source for Internet Appliance Upgrades and Mods		 Amazon Honor System Click Here to Pay Learn More
BBS Main List | Sign In | Sign Up | Search | Help | Linux-Hacker.netReply to Thread | Printer |

Home / I-Opener Areas / I-Opener Technical Stuff
Slight problem with a V4b

New MessageSlight problem with a V4b (modified 0 times) Ragnar1
Profile
Gang,
I was trying to remove Q16 from my V4b to move to another iopener where I had broken a pin on its Q16. I was using a 30watt iron. I hadn't had a problem removing other machines Q16. Even with the 30watt iron I can't get Q16 removed. And I think I fried it or the big capacitor to the right. Evidently the iron touched up against it while I was trying to remove Q16. Now I can't get the V4b to work. I am not getting any voltage to the processor. AT Q16 I get 3.3Vs on the right tab, but get nothing on the three left tabs. Consequently I get 0Vs at R160. All other voltages found on the board are good. I tried putting in one of my datels but I get the same problem. No voltage to the processor. My guess is the the big cap next to Q16 is fried. Does anyone know the part number and a place to order one? On the top of the cap are the numbers 99 , 1000 , 6X. Can anyone translate for me? TIA.
03-27-2002 11:36:48

New MessageRE:Slight problem with a V4b (modified 0 times) Linuxguru
Profile | Email
I don't have an open unit in front of me, so I'm guessing that this is a 1000uF, 6v electrolytic, and the year of manufacture is 1999. Electrolytics are easily damaged by heat, but before you remove it, test the circuit as follows:

1) Remove the CPU (you did remove the CPU before trying to remove Q16, didn't you?).

2) With the IO powered off, check the DC resistance between Vcore and GND with a multimeter. If it settles at less than about a few ohms, you've got a short and the cap is a good candidate for replacement.

3) Smaller values for this cap may also work, at the risk of high-frequency instability and higher ground bounce on Vcore. Use only SMT caps; the lead impedance on regular leaded caps is too high.

4) The FET Q16 is also easily destroyed, but more easily by static than by heat.

03-27-2002 13:56:00

New MessageRE:Slight problem with a V4b (modified 0 times) Linuxguru
Profile | Email
Oh, I forgot to ask - why the eff are you fingering a working V4b? It's worth much more than just a parts machine. If at all you want to extract parts, it should be the other unit with the damaged Q16 that should be used as a parts machine.
03-27-2002 14:00:16

New MessageRE:Slight problem with a V4b (modified 0 times) Ragnar1
Profile
Linuxguru

1. Of course

2. and 3: Thought so, just wanted comfirmation. Merci beaucoup.

4. That's nice to know.

5. I have two V5's, one V1 and this here V4b. I have also hacked a couple of V3's for friends. And now that I know what I know thanks to the many people on this board, I don't feel that a V4b is all that special. It's definitely the best one for a beginner to have, but I am comfortable hacking any version to do what I would like it to do. And to tell you the truth, if I get another one I would just as soon have a V1 or V2. I like these machines, but only if I can get them to ~600 mhz speed. At the best of times my phone modem only downloads at 50k bps at best. To me these machines are, at best, convenient toys to play with. The paradox of value, I guess.

Thanks,
Ragnar

03-27-2002 17:22:58

New MessageRE:Slight problem with a V4b (modified 0 times) Ragnar1
Profile
Oh,
And by the way, I call my V4b Lazarus. It has already came back from the dead six times. This will hopefully be the seventh. But it looks like a real Frankenweenie, though.

Rangar

03-27-2002 18:01:40

New MessageRE:Slight problem with a V4b (modified 0 times) Ragnar1
Profile
Found the problem. Does anyone have a spare Q16 that they would like to send me?
Ragnar
03-28-2002 19:57:27

New MessageRE:Slight problem with a V4b (modified 0 times) Reverend_Jones
Profile
Jack at http://www.badflash.com has Q16, $2 each.
03-28-2002 21:10:10

New MessageRE:Slight problem with a V4b (modified 0 times) mp3boombox
Profile | Email
I have a DEAD io board which i got off someone for an other part but if you need parts i got them. its a v1 but 99% of the parts stay the same regardless of version. Oh i have removed some parts so ask if your intrested.
04-08-2002 12:03:46

Reply to Thread | Printer |
All times are PSTPowered by UltraBoard v1.62


Copyright © 2000, Netmake Inc. All Rights Reserved.
See Terms and Conditions for more information.




i-opener opener laptop notebook computer help drivers dll free windows dos repair fix linux mac macintosh 2000 95 98 nt pc configure hardware software sound video netscape explorer network networking lan wan software cmos fat bios printer card mouse modem ide scsi cd rom controllers scanner tape hard drive cgi scripts source code mp3