PC Peripherals SHOCKING Cabinet - HELP!!!

max_ds said:
That doesnt mean the earthing is fine. Connect a bulb across live and earthing and see whether it glows. If yes then the earthing is fine.
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yeah, I already told him that in my previous post. If the bulb does not glow across the line and earth pins, then it means that the earthing is not proper.

@draz: Just check that once more, connect an bulb across the earth and line pins of the socket. If the bulb doesnt glow, then somewere the earth line is broken or not properly outside and you can call the electitian to fix it.
 
Stick said:
Before doing anything Just check that the Back part of your mother Board may some where touch the Cabinet. If not than check (if your mother board is fit to cabinet using Screw) whether you use BUSHIER (my dealer call it same) with Screw, if not, use same, it is a circle made from plastic or wood (may be) which have whole in middle, put same in between screw and cabinet whole to fit mother board to cabinet.
Click to expand...

A bush musnt be used in all holes, but only in non-metalized holes

Read this How to Install a Motherboard | Hardware Secrets
 
have checked the below of the mobo but nothings touching the cabinet other than the mobo screws .
Click to expand...

You find it the PROBLEM man, MOBO SCREWS fited in Cabinet and Power Pass from MOBO to Cabinet through SCREW. Use PVC screw to fit mobo with Cabinet. Some cabienet come with same and you only have to press your MOBO on it and screw automatically get inserted in MOBO SEREW HOLE.

Finally if no way is left just paint the Cabinet with Thin COLOR coat !
 
Hmmmmm.
Still I am thinking that its GROUND Problem. As the purpose of GROUND is to throw away the excess and body currents.

But, if it is not a GROUND problem, do these tests -

1. take power from a totally difference source, like from different room, not another point in the same room. Use a REAL 3pin extension cord.... borrow it from friends / relatives. Then start your PC, Test for ZAP.

2. If still, ON your PC, then take a TESTER and touch the body of the PC. If it glows very high then it must be 220volt, else 12 to 24 Volt.

A. if it is 220volt, remove the SMPS/PSU from the cabinet but keep all the connection intact. So, there will be no metal-metal contact between PSU and cabinet. Turn ON the PC. Now test with TESTER if - i. only PSU zapps ii. only Cabinet zapps. individually....

If only PSU zapps and cabinet NOT, then the problem is with you PSU. go for RMA.
else...... :huh: can't suggest anymore from here.....:no:

B. if it is of low-volt like 12-24volt check the cables of the PSU, may have some leak.
​
@max_ds and @Stick

Friend, its not true. Motherboard should be used with metal screws. As if a PSU malfunctions and sends higher volt, good motherboard tries to drain the excess current to GROUND via the cainet itself.

SOURCE: Peter Norton's Hardware Guide book.

also written in your given link -
max_ds said:
Read this How to Install a Motherboard | Hardware Secrets
Click to expand...

One of the most common mistakes while installing a motherboard is using these washers on all holes. This cannot be done. The metalized holes were metalized to make the proper grounding with the system case.
Click to expand...
 
No man its not the mobo screws, i mean the mobo gets on 12v supply doesnt it? then how could it give a shock?
Also metalized holes must have a metal screw without the bush and non metallized holes musht have a bush. Check the link i posted above.

it has to be the electrical wiring or the spike guard.

Try this :
1)Remove the power cord of the pc
2)Get another working spike guard from the friend. It must have three led lights and a colour code. It will tell u if any connections are wrong.
3)Plug this spike guard in the place from where u unpluged the power cord i.e. ups or stabilizer or directly from the socket.
4)Check the leds using the colour code
 
Friend, its not true. Motherboard should be used with metal screws. As if a PSU malfunctions and sends higher volt, good motherboard tries to drain the excess current to GROUND via the cainet itself.
Click to expand...

Are yaar, now days every one have Wooden Table/furniture for PC, how can you r theory stands than.

I gains suggest check MOBO and Screw Connection and UPS.

I nearly spend Rs.2500/- actually electrician is my Friend, he works for 3.00 pm to 9.00 pm and only Charge me Rs.100/- other wise any one in my area takes Rs.350/- for same work, he make New Connection from Building Main Board to my Room, inside room he make New Connection, he use 12mm wire but all is fail nothing is work, my H/W dealer to fail (Or Cheated) and in Agony I sold of Mobo,cabinet and Procy to him and buy New one and All Problem get solved automatically.

Conclusion SMPS/Power Supply is bad with OLD system.
 
Motherboard discarges through ground means it discharges through the earthing connected to the cabinet and not actual ground , so wooden tables dont matter.

neways
screw the motherboard as mentioned in the article
and then check the earthing using a spike guard
 
max_ds said:
Motherboard discarges through ground means it discharges through the earthing connected to the cabinet and not actual ground , so wooden tables dont matter.

neways

screw the motherboard as mentioned in the article

and then check the earthing using a spike guard
Click to expand...

Thanks for the ANSWER.
 
i dint read the whole thread, but there seems to be two problems here
1) the voltage reaching the PC case...
2)the earthing not removing the voltage

IMO #1 shouldnt happen in the first place, and is caused due to faulty internal wiring. even if #1 occurs, #2 should not occur. proper earthing usually takes care of any voltages reaching the case. however the case doesnt seem to be earthed.

the output of a PSU is all DC voltage. I doubt if DC can give us the same perception of shock as AC. so doubt if the mobo is responsible. AC stops at the PSU itself. so check the PSU's casing, whether it gets a voltage when you switch it on
 
greenhorn said:
i dint read the whole thread, but there seems to be two problems here
1) the voltage reaching the PC case...
2)the earthing not removing the voltage

IMO #1 shouldnt happen in the first place, and is caused due to faulty internal wiring. even if #1 occurs, #2 should not occur. proper earthing usually takes care of any voltages reaching the case. however the case doesnt seem to be earthed.

the output of a PSU is all DC voltage. I doubt if DC can give us the same perception of shock as AC. so doubt if the mobo is responsible. AC stops at the PSU itself. so check the PSU's casing, whether it gets a voltage when you switch it on
Click to expand...

man, I have told him loooooooooooooooooooooooooooooooooong time ago.
 
1)Change ur psu. it is leaking a small amount of current (ac) to ground through one of the high voltage transient suppressors inside the psu.
A fairly common problem in smps.
try switching the psu first if the problem remains then.....

2)it could also be due to ur monitor. the monitor and the cabinet share a common ground (via the video cable) and there is a smps inside a monitor.
so disconnect the video cable from the gfx card and check.
 
ok. First thing i will buy today is get that wired holder to check and rubber slippers :)

also the powersafe guy checked the psu by directly connecting it to the socket and there was no zap on the psu. so the psu shud be fine i guess.

todays agenda a thorough check of the earthing.

Also really appreciate all the help.
Thanks everyone
 
hey

I tried the bulb test.

So when i put the wires in live and neutral - the bulb glows.

but when i put the wires in live and earthing/ground - the bulb does not glow.

Same case with other sockets in my room.

when i tried the same test in the living rom - Poof - the fuse tripped and the entire house electricity was shut down.

after that i didnt try it agian.

I have called the electrician now. lets see if he can fix it as all the wires are concealed in the walls for this house.
 
hey... the electrician checked up and found that only my room doesnt have proper earthing...baaahhhh

also he cant add earthing as of now as al wires r concealed and my owner wont allow breakin walls.

Hey what can I do to fix this now?????? Any ideas?
 
As I said, if the bulb does not glow with live and earth, the cabling is not done properly or broken. Now one solution you can try without messing the walls (might work or not).

Make/get a switch board (plastic/wodden) with a 3 pin socket and switch. make the wiring such that the live and neutral are connected to a plug which you can plugin to the socket in the switch board. Get some length of thick insulated wire preferably with a single copper core and connect one end the earth pin of the board and the other end you can attach to a small metal pipe or rod and put it deep into the earth. outside your window or some place. This sould work most probably.

Another thing we tried with success back in the school days was to make a wooden switchboard in a similar manner and connect a clip (the insulated kind used in the science labs) at the other end of the earth wire and when ever its plugged in, the clip was connected to the window in the room. :eek:hyeah: A bit risky thing to do, but it used to work and anyway nobody ever bothered with the window when the old 186 machine was running. :p
 
owner has to allow adding the earthing. I think its compulsory. otherwise it may be fatal. You should try to get you electrician to take the earth from the working socket to the other rooms using ducted wiring. also you are paying maintainence to your owner aren't you? be serious about his and tke this up with the owner.
 
pastrykunal said:
owner has to allow adding the earthing. I think its compulsory. otherwise it may be fatal. You should try to get you electrician to take the earth from the working socket to the other rooms using ducted wiring. also you are paying maintainence to your owner aren't you? be serious about his and tke this up with the owner.
Click to expand...

Yeah, that would be the first logical thing to do. Ask the owner to get the earthing done as your stuff is getting damaged without the earthing. See if the electitian can do the earthing without damaging the walls like using PVC ducts. you can talk to your house owner about it. But these days people with houses in cities care less about the tenants as they can easily find another tenant even if one threatens to leave for some reason.
 
yup. you r dead rite. The owners hardly care for the nagging tenants.

am stayin in second floor so doing my own earthing mite me some prob with some stupid rule in our appartments that there should not be any external wiring to any appartments.
Anyways i am calling one more electrician tomm.

have sacrificed my 17" monitor to this freaking zap...dont wanna screw my new lcd
 
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