Jump to content


Photo
- - - - -

Wondering what differences between TW and China boards???


  • Please log in to reply
35 replies to this topic

#1 SAE

SAE

    Geek

  • Members
  • PipPipPip
  • 576 posts

Posted 24 June 2004 - 04:49 PM

Hi all. You know the differences between China and TW LP B/Infinities was one of the most discussed topics on DFI (besides warm/cold boot, hehe)... and I remember some electrical engineers saying they could not find differences (hello uwackme :D ).

Hmm. I just examined my China board and then compared it to the dead TW one.

1st pic: PCB

The China one looks brownish, TW is black...

[bIMG]http://www.xtremesystems.org/forums/attachment.php?s=&postid=478194[/bIMG]

The more interesting fact is the FB SMD caps... :D

[bIMG]http://www.xtremesystems.org/forums/attachment.php?s=&postid=478197[/bIMG]

[bIMG]http://www.xtremesystems.org/forums/attachment.php?s=&postid=478198[/bIMG]

So does anyone know what this means? Different values for them? I did not find any table to determine those...

ViperJohn? Anyone else?


ADMIN NOTE: PLEASE BE AWARE THERE IS A LIMIT ON POSTING PICTURES...ANYTHING OVER 800x600 IS TO HAVE THE BIMG TAG SO THE PAGES DO NOT SCROLL. THANK YOU

#2 Popcicle

Popcicle

    Member

  • Members
  • PipPip
  • 352 posts

Posted 24 June 2004 - 06:54 PM

Those are surface mount resistors. There will be a
number on the resistor iself. That number according to
their spec sheets will determine the resistance in OHMS
of that resistor. (across that bridge)

#3 Oberon

Oberon

    Member

  • Members
  • PipPip
  • 54 posts

Posted 24 June 2004 - 07:54 PM

not a number. resistors are normally classified by a series of colored bands. A few for the base resistance, one for eht multiplier, and one for a range above and below the specified resistance (a percentage)

#4 SAE

SAE

    Geek

  • Members
  • PipPipPip
  • 576 posts

Posted 25 June 2004 - 01:26 AM

Guys... that's not an ordinary SMD resistor, it's an inductive one, more like a capacity iirc. It's made from ceramic (and I always thought destroying them reveals a tiny tangle of wire)

The color code I was referring to has nothing to do with the color rings on normal resistors... no number, no color ring code there...

#5 AdvModDev

AdvModDev

    New Member

  • Members
  • 37 posts

Posted 25 June 2004 - 03:18 AM

I always thought the China plant was only responsible for end assembly of DIMM, AGP, and other slots. But the primary reason for China boards at all was cheaper overall production costs.

@SAE: maybe the color is irrelevant? Have you meausured them?

#6 SAE

SAE

    Geek

  • Members
  • PipPipPip
  • 576 posts

Posted 25 June 2004 - 03:51 AM

Resistance:

TW: dark grey caps: 500 mOhm (FB42/3)
light grey one: 1.076 kOhm (C9D5)

CHINA: white caps: 600 mOhm (FB42/3)
rosé one: 1.084 kOhm (C9D5)

diode test:

TW: dark grey caps: 0.001 kOhm (FB42/3)
light grey one: 1.09 kOhm (C9D5)

CHINA: white caps: 0.001 kOhm (FB42/3)
rosé one: 1.094 kOhm (C9D5)

rectangular signal output:

TW: dark grey caps: 0.001 kOhm (FB42/3)
light grey one: 1.745 kOhm (C9D5)

CHINA: white caps: 0.001 kOhm (FB42/3)
rosé one: 1.7 kOhm (C9D5)



Hmm. Weird ;)

#7 Popcicle

Popcicle

    Member

  • Members
  • PipPip
  • 352 posts

Posted 25 June 2004 - 04:48 AM

They would be allowed a certain % of + or -
on thier called for spec.

#8 Alexia

Alexia

    Geek

  • Members
  • PipPipPip
  • 508 posts

Posted 25 June 2004 - 11:38 PM

Everyone please stop with the thread crapping and get back on subject. This is not appropriate here.

Threats WILL NOT BE TOLERATED!

PMs have been sent to those involved.

#9 ViperJohn

ViperJohn

    Certified Geek

  • Members
  • PipPipPipPip
  • 1614 posts

Posted 26 June 2004 - 12:05 AM

Originally posted by SAE
Hi all. You know the differences between China and TW LP B/Infinities was one of the most discussed topics on DFI (besides warm/cold boot, hehe)... and I remember some electrical engineers saying they could not find differences (hello uwackme :D ).

Hmm. I just examined my China board and then compared it to the dead TW one.

ViperJohn? Anyone else?


The only difference I see in the SMC's in the picture is they are made by different manufacturer.
Nothing unusual about that as any sane MB makers will have at least two sources for components
like that.

With the exception of Electrolytics and Tantalums SMC's of the size are normally never marked.
They simply are not big enough. To determine the value they must be desoldered and tested with
a capacitance meter.

Viper

#10 ViperJohn

ViperJohn

    Certified Geek

  • Members
  • PipPipPipPip
  • 1614 posts

Posted 26 June 2004 - 12:07 AM

Originally posted by Popcicle
Those are surface mount resistors. There will be a
number on the resistor iself. That number according to
their spec sheets will determine the resistance in OHMS
of that resistor. (across that bridge)


Those are surface mounted ceramic capacitors in the pictures.
Viper

#11 ViperJohn

ViperJohn

    Certified Geek

  • Members
  • PipPipPipPip
  • 1614 posts

Posted 26 June 2004 - 12:13 AM

Originally posted by SAE
Resistance:

TW: dark grey caps: 500 mOhm (FB42/3)
light grey one: 1.076 kOhm (C9D5)

CHINA: white caps: 600 mOhm (FB42/3)
rosé one: 1.084 kOhm (C9D5)

diode test:

TW: dark grey caps: 0.001 kOhm (FB42/3)
light grey one: 1.09 kOhm (C9D5)

CHINA: white caps: 0.001 kOhm (FB42/3)
rosé one: 1.094 kOhm (C9D5)

rectangular signal output:

TW: dark grey caps: 0.001 kOhm (FB42/3)
light grey one: 1.745 kOhm (C9D5)

CHINA: white caps: 0.001 kOhm (FB42/3)
rosé one: 1.7 kOhm (C9D5)

Hmm. Weird ;)



Capacitor values are not measured in ohms. They are measured in Farads (actually picofarads in this case). A cap will read open unless it is shorted or is a large size then it will read an ohmic value until it is charged by the measuring device.

Viper

#12 SAE

SAE

    Geek

  • Members
  • PipPipPip
  • 576 posts

Posted 26 June 2004 - 05:07 AM

Originally posted by ViperJohn
Capacitor values are not measured in ohms. They are measured in Farads (actually picofarads in this case). A cap will read open unless it is shorted or is a large size then it will read an ohmic value until it is charged by the measuring device.

Viper



I know... but I don't have this good equipment... ;)

C = Q/Uc :D