HELP Shorted circuit board?

i have a ipod video 30 gb and it was screwed up all of the sudden it had the sad faced error message and the hard drive just kept clicking. so i opened it up and took out the hard drive (following a do it yourself site) to reset the disk maganger. when i did that i removed the battery ribbon from the clip and when i put it back in i accidentally put it in backwards. sure enough the **** circuit board and face cover in the area of the battery connection heated up pretty **** hot(a short). i put it all back together properly but now it wont turn on or reset. But when i plug it in it says please wait battery very low. But it justs charges for ever and ever. Did i fry my board? is that replaceable without warranty? why was the harddrive clicking before and is the battery still gona be okay? lots of questions but advice is much appreciated!

You can do a search for iPod repairs. Most of the companies will give you a quote on the repair price.
Mort

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Help!!! e66 short circuiting?

Hi there,
I was working and using my e66 perfectly until about a month ago. What happened was that a couple seconds after getting to the main screen upon opening the phone, the camera function would automatically start, putting the phone in camera mode. Then it would be constantly revert back from camera mode to the main ``desktop` screen, preventing me from being able to do anything else. It would also go to the email inbox and back waiting for me to type a message. I tried all resets including the hard reset, removed sim, memory cards as well-no luck.
Any ideas? Does this sound like a short circuit?
Thanks

Maybe problem is from the keypad. does this happen when keypad is locked too?!
Anyway, my advice is take it to Nokia Care center asap.
Click on the Kudos Star, if you find my post helpful!

Can you get an ipod touch 2nd gen working after a short circuit?

I was replacing the screen on my 2nd gen iPod touch, and when I was trying to lift the screen (not the glass, the display) out I accidentally and stupidly touched two chips (I think)on the board in the bottom left (the top two of the set of three brown and silver ones) together with a metal ended screwdriver, it made a quiet high pitched noise and then I couldn't turn on the display ( by pressing the lock button) , I would've turned the iPod off before hand but the touchscreen didn't work at all so I couldn't and looking back at it I really should've just waited until the battery died. But I didn't :(. Please help.

thanks, i actually checked it this morning and it was coming on to the low battery connect to power screen but the screen looked all messed up, i dont know if this was because of the short circuit or because of when i tried to take the screen out after i had short circuited it, either way i have to replace it anyway as it already had dead pixels, the reason i as this is because i dont know wether the other screen will work normally if i put it in, i dont want to fit it to find out it doesnt work.

IMac to tv with hdmi short circuit

I have my iMac (Intel) connected to my Sony tv with an hdmi adapter. It works fine except that sometimes the iMac seems to short circuit and turn off. I read once that my cable may not be appropriate but then I lost that info. Can anyone help?

For the "Arangements" option to appear, the external display must be turned on with the correct input selected and connected to the computer. Then close system prefs, reopen, go to "Display" and "Arrangement" will be along the top.

Macbook air A1237 short circuiting

I have just bought a macbook air A1237 the 13 inch screen - it was second hand and had a few problems.
First problem was once turned on it was show the restart screen and that would be a constant loop, managed to fix that problem so it starts and works properly
Second Problem - No battery, it wont hold charge - obvious fix replace the battery - need to do,
Third Problem - No sound, the tricky one.
The laptop had already been taken to a computer repair shop before i purchased the item - the shop is obvoiusly not competent enough to work on computers due to the fact they could not repair the restart problem (which took a non-computer techie less then 30 mins). and half of the screws from the device are missing - one on the case and all except one on the battery.
I searched around on the net for a fix for the audio and found a tutorial that said remove the sound ribbon and place it above the battery, so i did this and it worked, turned the machine off and screwed the case back together and no sound... removed the case and i had sound ?? screwed the case back on whilst turned on i had sound for 2-4 hours before it went off... Still only works when the device has no bottom on,
On anther note when i had the device with no bottom on i leaned over the machine and got a shock on my chin, didnt think anything of this due to the case being open, so screwed it all back together and thought f**k it, its a machine with no sound.
After talking to a friend who loves his apple products he mentioned that the device could be short circuiting, so i checked the electric shock on my chin again and i got one from the device and every now when using it i get one on my arm or hand??
So my question is - What could be causing the short and why is the device working properly apart from sound when short circuiting ??
Also i have downloaded OS lion - the machine is currently on OS X 10.6.8 and it will not let m upgrade? it starts the upgrade then just crashes ? any ideas?
Ps. Sorry for my spelling.

With the keyboard, if working correctly and marked as such, the "3" should also
have the "#" as an option using the Shift key. There are additional hidden keys
that these same buttons can provide, conditionally, with use of the "fn" function
key; this acts like a super-shift key in certain instances. Some keys on a main
external keyboard are condensed on a portable keyboard, & appear with 'fn'.
To tell what the keyboard can provide in various alternatives, you could find
and activate the Keyboard Viewer from within the System Preferences>
International> Input Menu. With 'visible in menu bar' activated, one can
more readily access it and the ability to tell what keys and shift, opt, etc
combinations, or the fn key, can make appear in documents or elsewhere.
The Keyboard Viewer opens into a small window on the desktop, so keys
that are pressed are highlighted on a tiny screen in there. You can also click
on the tiny keys in there to make them work in a document.
Notice the choices in the Input Menu section, as you can set it so Character
Palette and Keyboard Viewer both appear under the Flag icon in main Menu
bar in the Finder or main desktop. Saves having to open Sys Prefs to see it.
Some of the user interface points of reference change over time or between
versions of OS X. So do some names of things, esp with Mt Lion/Mav. In a
way it's good all older Intel-Macs can't run Mavericks 10.9.2. Less trouble.
Other part sources?
http://www.macrepairs.co.uk/parts/
http://www.applemacparts.co.uk/store/macbook-air-c-8130.html
Anyway, hopefully some of this helps a bit.
Good luck & happy computing!

Swapping circuit boards for an internal hard drive

My story may be a bit long and roundabout, so please try and bear with me as I explain.
My PowerMac G5 is 4.5 years old and over the past few months, the DVD and my secondary internal hard drive, both the originals that came with my computer, have been slowly dying. I finally replaced the DVD drive the other day and was little by little copying the data off my secondary internal drive before it completely failed. One thing that seemed to help the internal drive run more smooth was unplugging the power cable and plugging it back in. A worker at an Apple store's Genius Bar also suggested swapping each internal drive to the bay that the other was originally in, to see if that helped at all.
Anyways, in the end, the drive was giving me so much trouble and I had unplugged/plugged the power cable so many times that eventually the part of the circuit board that holds the pin connectors straight broke off, so now I had no way to get my data off the slowly failing drive. Another visit to the Genius Bar and I was told that the drive was as good as done, but not wanting to believe that the majority of my film projects were gone forever, I contacted a store across the street from my old NYU dorm called Digital Society. They told me that the circuit board on the drive needed to be replaced and that the new board had to be taken from an identical drive. I soon realized that the primary/system drive of my G5 was in fact identical. So, after running Time Machine, purchasing new primary and secondary internal drives, re-installing the OS and doing a Time Machine restore - which was flawless - I took my two drives back to Digital Society where they swapped the circuit boards rather quickly.
Now that I'm back home, I was easily able to recover all my data from my failing drive... only after having its circuit board replaced, the drive is showing no signs whatsoever of the read/write difficulties and failures that it had been showing prior to the circuit board swap, which leads me to a few questions
a) Was it really the drive that had a problem, or the circuit board itself? Is there anywhere I could buy just a circuit board without having to buy a new drive just to get a circuit board? The drives in question are 400 gig Hitachi Deskstar, model #HDS724040KLSA80. While I'm not entirely sure the once failing drive should be trusted again, my old system drive - which now has a busted circuit board on it - still works perfectly fine.
b) If I'm able to get a new circuit board, how easy is it to replace myself? The guy at Digital Society did it very quickly and for a price of $120. Are there any video tutorials?
Thanks!

Lot's of good question Will,
Hard drives are not what they used to be, if your work is important I'd replace them every 3 years & have 2 backups in the meantime.
I doubt you can get the circuit boards separate without buying a while questionable drive.
If I'm able to get a new circuit board, how easy is it to replace myself? The guy at Digital Society did it very quickly and for a price of $120.
1 TB 3 year warranty $99...
http://eshop.macsales.com/item/Samsung/HD103SJ/
1 TB 7 year warranty...
http://eshop.macsales.com/item/Samsung/HE103UJ/
More cheaper drives...
http://eshop.macsales.com/shop/hard-drives/3.5-SerialATA/WesternDigitalCaviar

My imei number in my iphone 4 circuit board doesnt match my box or sim tray,when i go into itunes,preferences,devices and wave the mouse over the iphone,it doesnt tell me my imei number and my phone wont turn on too check it that way,any ideas?,

i need help to find my imei number in i4,phone wont turn on tried all reset procedures,sim tray different to circuit board as advised by apple when it went back for warranty,cant view in devices in itunes either,any ideas?

Try doing a restore in recovery mode or what is known as DFU.
Instructions to boot into DFU can be found here:
http://www.youtube.com/watch?v=34v8HMC9B98
Once in DFU mode, plug into iTunes and click Restore.
I know you said you tried all reset procedures, but I want to be sure.
Note: This will delete all your data on the Phone, hopefully you have a backup.

How do i fix my short circuited ipod

Is there anyway i can fix my short circuited ipod touch.

Not really. Also, the short may have damage some of the chips on the board.

IMac G3 Short Circuit Repair

Hello. I have an iMac G3 400 Ruby (summer 2000 I think). I tried to install LED beat lamps to the speakers, which worked for some time, however, a bad connection (I found this) in the wires leading to one of the LED's caused a short-circuit of the speaker when I turned on the machine. Smoke came out of the iMac before I could unplug it.
Now the iMac doesn't turn on. The green power LED comes on, but that's it. The screen stays dark, but sometimes lights up just a little. There are no sounds, and I can't hear the hard drive as usual.
I think the damage might be in the logic board or the analogue board. Where exactly do the speakers connect to on these computers? If it's the logic board, that will be easy to replace; I am very wary about opening up the CRT compartment to change out the analogue board.
Where do the speakers connect to and could that be where the damage is?
Thanks
-Nathan

Try following this procedure to reset the PMU to see if there is any improvement.
http://mrjcd.com/junk/PMU.jpg
Hopefully, the smoke came from insulation burning off the internal speaker wires, and not anything burning out on any board.
Most people here would not have experience attempting anything that would cause a short out like you describe, so the only way to diagnose the problem may be to swap components one at at time. The main logic board would be a good place to start.

Short Circuit on Inductor

Hi..
I have a simple query. How does Multisim behave to a short circuit? I take a DC source connected to an inductor. When I make it short, it should show me a msg like "The inductor gets burnt" or something like that. In stead, it shows a straignt line in an oscilloscope.
I can't prove this thory in Multisim, "A short circuit is an accidental low-resistance connection between two nodes of an electrical circuit that are meant to be at different voltages. This results in an excessive electric current (overcurrent) limited only by the Thevenin equivalent resistance of the rest of the network and potentially causes circuit damage, overheating, fire or explosion."
I shall be glad to receive the exact solution.
Solved!
Go to Solution.

Do not know if this will help, but there are components in the database in BASIC>RATED VIRTUAL. that actually simulate being "blown" by excessive current or voltage.
Another option would be to have two simulator circuits on screen at the same time. One with the fault and one without it. Hook Multisimeter/O-scopes to both circuits to demonstrate how the fault effects the voltages/currents in the circuit.
Multisim usually does not scream at you when a short occurs as most voltage sources are idea and really not affected by shorting across them. The ideal sources can handle the current within the simulator without "blowing" so to speak. I know this isn't what happens in reality, but everyone needs to keep this in mind when designing a circuit. Always be sure of the current draw from the source and wheither the "real" source can handle it as well as well as the "real" components in that circuit.
One other point. I notice you said you were using an inductor. All of Multisim inductors are ideal and have no internal resistance. Therefore, in a DC circuit they would only be a intial impedence there as the voltage was switched from 0VDC to 12VDC and then it would act as a short anyway. They are pure reactance only and this means that only in an AC Circuit would they display resistive properties. In order to model the DC resistance of an inductor in MS you have to have a series resistor tied to it.
I agree with you that there should be some type of warning that a short is occuring in the spreadsheet or somewhere.
I hope some of my ramblings have helped here.
Message Edited by lacy on 09-02-2008 05:18 PM
Kittmaster's Component Database
http://ni.kittmaster.com
Have a Nice Day

I am trying to use the RS232 to control a circuit board. It would have to simultaneously output SerialClock, DataIn, and Chip Select signals, while also receiving DataOut signals; therefore 4 signals total. Does anyone know if it this is possible?

I am trying to splice 4 wires out of the RS232 serial cable (the 9-pin type) and wire them to a circuit board. The 4 wires would control 4 signals: DataIn, DataOut, SerialClock, and ChipSelect. The serial clock would synchronize the DataIn and the ChipSelect is asynchronous. DataOut must coincide with SerialClock also; therefore there are 3 signals that must be able to switch concurrently. All the handshaking enabled by RS232 is thus unnecessary in my opinion. Does anyone know of how this can be done?

I am trying to splice 4 wires out of the RS232 serial cable (the 9-pin type) and wire them to a circuit board. The 4 wires would control 4 signals: DataIn, DataOut, SerialClock, and ChipSelect. The serial clock would synchronize the DataIn and the ChipSelect is asynchronous. DataOut must coincide with SerialClock also; therefore there are 3 signals that must be able to switch concurrently. All the handshaking enabled by RS232 is thus unnecessary in my opinion. Does anyone know of how this can be done?

My printer makes a short-circuit on my telefphoneline when I plug it in so my fax can't function

My printer makes a short-circuit on my telephone line when I plug it in so my fax can't function
When I print (both not wireless and wireless) I can print maybe one or more pages and the the print stops half way in a pageprint for 30 sec to 1 or 2 minutes - and then continues the printing
I bought the printer on jan. 11, 2011
Do I miss to install a driver or.... is there a problem with the printer?

You need to put the iPod into disk mode before it will show up on your desktop; if it is in disk mode and won't show up, open the Finder's preferences and check what's set to show up on the desktop.
(10434)

Broken coax cable from circuit board to Airport Extreme

I picked up this 1.25Ghz-DP/1024MB/FW800 off the internet knowing that it did not come with either the Airport Extreme or the Bluetooth (1.1) module. No big deal, since I have an AE and would be looking for the BT Module. To my surprise, its "AE/Bluetooth-ready" status was compromised by the removal of the AE card using a pair of side cutters (or some other crude cutting tool), leaving a frizzy antenna cable running back down into the space between the chassis and the case. It would appear that the BT antenna is intact, for what it is worth.
I know there would be some challenges, but I am wondering if the part is available that includes the circuit board, the antenna, and the antenna coax leading from the circuit board back to the connector on the AE. Or maybe the part numbers?
I plan to use this for an older version Digidesign's Pro Tools, so I am going to remove the two four-port cards (one FW, one USB) and replace them with the PT Mix Core and Farm(s). I would prefer not to go with the USB dongle, since I know there can be flakiness with USB and PT. My alternative to taking the plunge with a soldering iron and some parts would be to get an AEBS nearby and connecting with ethernet.
The computer sees the card in System profiler, but without the antenna fully deployed, it fires blanks. Are the resources for the connector and cable that could be put together to paste it back in place or better yet, a place to get the complete unit to change it out. I guess I would be looking for the BT module, too as long as I am at it, but that is not a critical issue.
Thanks---Dave Iverson

Hi Dave,
Here is a third-party external extension antenna that might replace the existing stub:
http://www.macwireless.com/html/products/antennas_boosters/whips.php
Installation in a G4 mini-tower is easy; you only need to remove a PCI slot cover on the back to run the cable outside the box. I have no personal experience with this; just something I found in searching after I read your post.
Danny,
Welcome to Apple Discussions!
Looks like the above product should work for an iMac. Check the list of instructions on the page I linked to see if they list your computer. I suspect you have to take something apart to run the cable. Also check the iMac G5 forums to see if someone there has already figured it out for that model. The iMac G5 hardware is nothing like the G4 mini-towers that are the subject of this forum area, so your chances of getting the right answer for your specific computer are better in the other forum I linked.
If you are having trouble figuring out how to start your own thread (so many people do that I must ask), see this Apple info:
http://discussions.apple.com/ann.jspa?annID=650
Allan

Pl/sql boolean expression short circuit behavior and the 10g optimizer

Oracle documents that a PL/SQL IF condition such as
IF p OR q
will always short circuit if p is TRUE. The documents confirm that this is also true for CASE and for COALESCE and DECODE (although DECODE is not available in PL/SQL).
Charles Wetherell, in his paper "Freedom, Order and PL/SQL Optimization," (available on OTN) says that "For most operators, operands may be evaluated in any order. There are some operators (OR, AND, IN, CASE, and so on) which enforce some order of evaluation on their operands."
My questions:
(1) In his list of "operators that enforce some order of evaluation," what does "and so on" include?
(2) Is short circuit evaluation ALWAYS used with Boolean expressions in PL/SQL, even when they the expression is outside one of these statements? For example:
boolvariable := p OR q;
Or:
CALL foo(p or q);

This is a very interesting paper. To attempt to answer your questions:-
1) I suppose BETWEEN would be included in the "and so on" list.
2) I've tried to come up with a reasonably simple means of investigating this below. What I'm attempting to do it to run a series of evaluations and record everything that is evaluated. To do this, I have a simple package (PKG) that has two functions (F1 and F2), both returning a constant (0 and 1, respectively). These functions are "naughty" in that they write the fact they have been called to a table (T). First the simple code.
SQL> CREATE TABLE t( c1 VARCHAR2(30), c2 VARCHAR2(30) );
Table created.
SQL>
SQL> CREATE OR REPLACE PACKAGE pkg AS
2     FUNCTION f1( p IN VARCHAR2 ) RETURN NUMBER;
3     FUNCTION f2( p IN VARCHAR2 ) RETURN NUMBER;
4 END pkg;
5 /
Package created.
SQL>
SQL> CREATE OR REPLACE PACKAGE BODY pkg AS
2
3     PROCEDURE ins( p1 IN VARCHAR2, p2 IN VARCHAR2 ) IS
4        PRAGMA autonomous_transaction;
5     BEGIN
6        INSERT INTO t( c1, c2 ) VALUES( p1, p2 );
7        COMMIT;
8     END ins;
9
10     FUNCTION f1( p IN VARCHAR2 ) RETURN NUMBER IS
11     BEGIN
12        ins( p, 'F1' );
13        RETURN 0;
14     END f1;
15
16     FUNCTION f2( p IN VARCHAR2 ) RETURN NUMBER IS
17     BEGIN
18        ins( p, 'F2' );
19        RETURN 1;
20     END f2;
21
22 END pkg;
23 /
Package body created.Now to demonstrate how CASE and COALESCE short-circuits further evaluations whereas NVL doesn't, we can run a simple SQL statement and look at what we recorded in T after.
SQL> SELECT SUM(
2           CASE
3              WHEN pkg.f1('CASE') = 0
4              OR   pkg.f2('CASE') = 1
5              THEN 0
6              ELSE 1
7           END
8           ) AS just_a_number_1
9 ,      SUM(
10           NVL( pkg.f1('NVL'), pkg.f2('NVL') )
11           ) AS just_a_number_2
12 ,      SUM(
13           COALESCE(
14             pkg.f1('COALESCE'),
15             pkg.f2('COALESCE'))
16           ) AS just_a_number_3
17 FROM    user_objects;
JUST_A_NUMBER_1 JUST_A_NUMBER_2 JUST_A_NUMBER_3
              0               0               0
SQL>
SQL> SELECT c1, c2, count(*)
2 FROM   t
3 GROUP BY
4         c1, c2;
C1                             C2                               COUNT(*)
NVL                            F1                                     41
NVL                            F2                                     41
CASE                           F1                                     41
COALESCE                       F1                                     41We can see that NVL executes both functions even though the first parameter (F1) is never NULL. To see what happens in PL/SQL, I set up the following procedure. In 100 iterations of a loop, this will test both of your queries ( 1) IF ..OR.. and 2) bool := (... OR ...) ).
SQL> CREATE OR REPLACE PROCEDURE bool_order ( rc OUT SYS_REFCURSOR ) AS
2
3     PROCEDURE take_a_bool( b IN BOOLEAN ) IS
4     BEGIN
5        NULL;
6     END take_a_bool;
7
8 BEGIN
9
10     FOR i IN 1 .. 100 LOOP
11
12        IF pkg.f1('ANON_LOOP') = 0
13        OR pkg.f2('ANON_LOOP') = 1
14        THEN
15           take_a_bool(
16              pkg.f1('TAKE_A_BOOL') = 0 OR pkg.f2('TAKE_A_BOOL') = 1
17              );
18        END IF;
19
20     END LOOP;
21
22     OPEN rc FOR SELECT c1, c2, COUNT(*) AS c3
23                 FROM   t
24                 GROUP BY
25                        c1, c2;
26
27 END bool_order;
28 /
Procedure created.Now to test it...
SQL> TRUNCATE TABLE t;
Table truncated.
SQL>
SQL> var rc refcursor;
SQL> set autoprint on
SQL>
SQL> exec bool_order(:rc);
PL/SQL procedure successfully completed.
C1                             C2                                     C3
ANON_LOOP                      F1                                    100
TAKE_A_BOOL                    F1                                    100
SQL> ALTER SESSION SET PLSQL_OPTIMIZE_LEVEL=0;
Session altered.
SQL> exec bool_order(:rc);
PL/SQL procedure successfully completed.
C1                             C2                                     C3
ANON_LOOP                      F1                                    200
TAKE_A_BOOL                    F1                                    200The above shows that the short-circuiting occurs as documented, under the maximum and minimum optimisation levels ( 10g-specific ). The F2 function is never called. What we have NOT seen, however, is PL/SQL exploiting the freedom to re-order these expressions, presumably because on such a simple example, there is no clear benefit to doing so. And I can verify that switching the order of the calls to F1 and F2 around yields the results in favour of F2 as expected.
Regards
Adrian

Is there a gerber view to view printed circuit board gerber files?

Please advise to which gerber viewers are good for Mac products. I use windows at work but have Mac products and operating systems at home? Do you havea suggestion for a free gerber viewer for printed circuit boards gerber viewers.

There are several. Gerbv, MCN Gerber Viewer, Kicad and more. I have a list at:
http://www.rau-deaver.org/PCBLinks.html

HELP Shorted circuit board?

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