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SAE

Wondering what differences between TW and China boards???

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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

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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)

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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)

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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...

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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?

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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 ;)

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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.

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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

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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

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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

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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

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