Component name on a laptop motherboard.

[nagper]

Sorry for the lame question... I have got an acer aspire 1670 laptop motherboard. Could anyone please tell me the name of the component on the picture below under the red arrow?
resistor? diode?

https://picasaweb.google.com/lh/photo/EwW_EhV_Vqeoit6lwXqvAphKRpdbdZMR2g80XAskZZg?feat=directlink

Thank you!
Peter

 

[mozzo]

I agree

 

[malcolmsanford]

Yes, most likely a decoupling capacitor for one of the chips. You'll find labelling for most smt chips on the motherboard somewhere and diff manufacturers use diff conventions, but usually similar.

No not for capacity, it's purely to uniquely identifying a component on a motherboard ... bears no resemblance to it's capacity (unless coincidental).

You may find getting someone to measure it a bit of a challenge, you'll need someone with an ESR meter that can be used with smt components. You could try one of your local electronics companies, if you have any in your area.

Sorry when you say measure it, do you mean see if it's working or what it's capacitance is ? ... if it's the latter then it's a capacitance meter that's needed. The ESR is normally for fault finding.

Spot on Tel, the ESR will work fine with comps in place, capacitance won't.

It's unusual for one of the smt ones to fail, more usual for the large electolytics to go, often in the PSU (cause of many failures). Most of the more modern motherboards have started to use solid capacitors now for better reliability (circa 10 years claimed by some manuf).

Top posts there my man, as someone that uses a computer but as no idea how they work really, I still trying to adapt to telly's without valves ........................think a thank you is in order

 

[telectrix]

no valves now malcolm, and very few CRTs. don't you just miss the little white dot that used to stay in the middle ofr the screen for a minute after you switched off. and all the little knobs round the back to adjust the picture size etc.

 

[malcolmsanford]

no valves now malcolm, and very few CRTs. don't you just miss the little white dot that used to stay in the middle ofr the screen for a minute after you switched off. and all the little knobs round the back to adjust the picture size etc.

Stop it now your getting me all emotional ....................my favourite was the epilogue followed by the national anthem and the public service advise to unplug your set from the wall socket ..............or in my Nan's case the light pendant

I still can see my old nan in the miners mansions with fire, telly, light, radio, iron all plugged into the lights .....ahhhhhhhhhhhhhh where's my hovis

 

[telectrix]

and don't forget the box bodged onto the back of the set to get ITV when it first started.

 

[malcolmsanford]

We were all right mate ...........................radio rentals gave us that new fangled telly that picked up ITV, though it was an extra half a crown a week I think

 

[telectrix]

once worked for Rediffusion. first cable T|V system. channel selector on windowsill, got wireless as well.

 

[malcolmsanford]

get in .......................2 way family favourites on a Sunday followed by the Navy lark lol ............................god where is philisan

 

[topquark]

and don't forget the box bodged onto the back of the set to get ITV when it first started.

Couldn't get ITV when it came out only BBC1/2 for ages.

 

[mozzo]

I guess I better not mention RRL and MFM control boards for 10mb harddrives, 640kb memory and 5.25 floppy
I was not involved in domestic electrics back in the day but judging by all the old houses with old wiring that I have been to to unvestigate faults it would seem that anybody was doing house wiring before competent persons scheme came along to try to sort things out.
When is it going to be a criminal offence to do electrics without being competent / licensed

 

[topquark]

RRL? Do you mean RLL?

 

[topquark]

That's what I did my first IBM PC training on the original old IBM PC, just before I started working at Hursley

 

[malcolmsanford]

I guess I better not mention RRL and MFM control boards for 10mb harddrives, 640kb memory and 5.25 floppy
I was not involved in domestic electrics back in the day but judging by all the old houses with old wiring that I have been to to unvestigate faults it would seem that anybody was doing house wiring before competent persons scheme came along to try to sort things out.
When is it going to be a criminal offence to do electrics without being competent / licensed

No your quite right bad workmanship is something that as not just happened, it as always been a part of our industry and afraid to say it will always be.

The trouble is poor tradesman coupled with DIY'ers and Stan from down the pub who can dabble a bit is a fact of life. Yes there are many a death trap out there, but I still wager you can find just as many VIR installations that are as sound now as when they were installed 50 odd years ago.

One of the last lofts I got up in was a friends Victorian house and there was the lead sheathed Twin cable, dressed around the loft on buckle clips and out of curiousty I IR it and still got 500 on the meter, my mate reckons he remembers the rewire done when he was a kid and that must have been 50 odd years ago, all the cables dressed into adaptable boxes and then single down to roses that had been fitted in the 70's. It was a work of art, and most likely would have lasted another 50 years.

 

[Engineer54]

No your quite right bad workmanship is something that as not just happened, it as always been a part of our industry and afraid to say it will always be.

The trouble is poor tradesman coupled with DIY'ers and Stan from down the pub who can dabble a bit is a fact of life. Yes there are many a death trap out there, but I still wager you can find just as many VIR installations that are as sound now as when they were installed 50 odd years ago.

One of the last lofts I got up in was a friends Victorian house and there was the lead sheathed Twin cable, dressed around the loft on buckle clips and out of curiousty I IR it and still got 500 on the meter, my mate reckons he remembers the rewire done when he was a kid and that must have been 50 odd years ago, all the cables dressed into adaptable boxes and then single down to roses that had been fitted in the 70's. It was a work of art, and most likely would have lasted another 50 years.

I'll wholeheartedly second that opinion Malcolm, ...You often here on these forums about how bad these cables and installations are, when in reality it has only ever been the striped tails of these cables that have been any problem. That, ...was mainly caused by heat from enclosed incandescent light fittings and overloaded socket outlets etc... I've never striped back a lead sheathed or TRS/ CRS cable and found the insulation perished or cracking up, on any cable that had not been abused. By abused, i mean cables that had been subjected to continuous overheating or overloading beyond there rating by homeowners adding additions and additions... (extra socket outlets, multi gang adaptors etc)

I would also rank those old buckle clips, superior to the modern day plastic clips in both appearance and longevity. Plastic clips seem to degrade with age and crack, whereas those old tinned copper buckle clips seemed to just last forever...lol!!! As you say, you can make a surface installation look a work of art with them!! I wonder how many sparks these days even bother to clip cables in loft spaces, probably more don't, than do ...lol!!!


When i rewired my parents old house, i actually used the pulled out 7/029 TRS to wire up the garage sockets, and when i checked the wiring prior to selling the house in 2001, ...all was still in excellent condition, and probably still there to this day, all installed in Galv conduit and Galv trunking with MK metal-clad accessories!!!
That old rubber cable stands up to the freezing UK weather far better than today's PVC cables ...lol!!

 

[mozzo]

yes, meant RLL topquark. Good ole days. As for the cabling, i have IR tested to 500V a few rubber cables and if they test ok then I leave well alone, upgrade the CU and move on.