Ohmerone
Well-known member
Or Just a Bad Batch were going Thru?
Several Taiwan, also known as Formosa , is an island situated in East Asia in the Western Pacific Ocean and located off the southeastern coast of mainland China.
Taiwan comprises most of the territory controlled by the Republic of China since 1949...
ese electrolyte manufacturers began using a stolen formula that was incomplete, and lacked ingredients needed to produce a stable capacitor.
The first flawed capacitors were seen in 1999, but most of the affected capacitors were made in the early to mid 2000s, and while news of their failures (usually after a few years of use) has forced most manufacturers to fix the defects, some bad capacitors were still being sold or integrated into designs .
When a faulty capacitor is charged, the Water is a chemical substance with the chemical formula H2O.
Its molecule contains one oxygen and to hydrogen atoms connected by covalent bonds.
Water is a liquid at ambient conditions, but it often co-exists on Earth with its solid state, ice, and gaseous state, water vapor or...-based electrolyteElectrolyteIn chemistry, an electrolyte is any substance containing free ions that make the substance electrically conductive.
The most typical electrolyte is an ionic solution, but molten electrolytes and solid electrolytes are also possible....
becomes unstable and breaks down, producing Hydrogen is the chemical element with atomic number 1.
It is represented by the symbol H.
With an atomic weight of , hydrogen is the lightest and most abundant chemical element, constituting roughly 75 % of the Universe's elemental mass.
Stars in the main sequence are mainly composed of hydrogen Gas
Since these types of capacitors are sealed in an aluminium is a silvery white and ductile member of the boron group of chemical elements. It has the symbol Al and its atomic number is 13.
It is not soluble in water under normal circumstances....
casing, the pressure builds up within the capacitor until either the flat metal top of the capacitor begins to bend, or the rubber sealing plug is pushed down.
Eventually the pressure exceeds the strength of the metal casing and venting occurs, either by blowing out the rubber bottom of the capacitor, or bursting the scored metal vent on the top of the capacitor. When an electrolytic capacitorElectrolytic capacitorAn electrolytic capacitor is a type of capacitor that uses an electrolyte, an ionic conducting liquid, as one of its plates, to achieve a larger capacitance per unit volume than other types. They are often referred to in electronics usage simply as "electrolytics"...
bursts, effects can range from a pop and a hissing noise to a small explosion. Venting is typically messy, and the corrosive electrolyte must be cleaned off the motherboard to prevent further damage.
During those years the caps went into almost every device used Today.
Computers,Tvs,Power supplys Etc.
Even if the cap isn't domed,vented or Bulged, it still may have a high ESR!!
Needs to be measure with the correct equipment or just replace!!
Whens it's cold it may check good, need to warm it up alittle,measure it again!
Even surface mount caps suffered a problem going thru reflow oven as they were
soldered to the pcb,it damaged the rubber seals,causing them to dry up the Electrolytic inside.
The root cause of failure for bulging Taiwanese capacitors has been hypothesized to be dissolution of the aluminum into the electrolyte due to poor phosphate-electrolyte balance, rather than the normal evaporation of the electrolyte that all such capacitors undergo. This hypothesis has been confirmed by analyzing the electrolyte using energy dispersive X-ray spectroscopy (EDS), which confirmed the presence of dissolved aluminum in the Taiwanese capacitors' electrolyte, but not in Japanese ones, and by electrical testing, which confirmed a thinning of the dielectric, because the capacitanceCapacitanceIn electromagnetism and electronics, capacitance is the ability of a body to hold an electrical charge.Capacitance is also a measure of the amount of electrical energy stored for a given electric potential.
A common form of energy storage device is a parallel-plate capacitor...
increased before failure, rather than the normal decrease thorough electrolyte evaporation. The industry standard test failed to capture this behavior, likely because the high voltage used in the test significantly retards the dissolution, whereas it occurs faster at the production environment voltages.
Actually its a good thing,we are getting work out of it, in all types of trades..
Most just vent slowly,causing a slow death and no blown fuse's Or damaged diodes,transistors Etc
I know this is Old Info,but its just a reminder that we need to check them before we
throw in the towel and give up on the board,just because its cheaper now..those
dam video cards are not cheap i seen a few in them.
I got this info at a website,just to have alittle better details of WHY they are failing
like they are..if you like to know more,research the Title.
Electrolyte caps have always failed, but not like these because they were made wrong..
Things to know and watch out for.
I have the tech's just bring in the Mother boards/ video cards,lcds in before they fail
when its a slow time durig the year,for preventive maintance.
Because they will fail!! different brand caps too.
Any BAD Experinces with these or other Electrolyte caps in the past?
Anyone?
Several Taiwan, also known as Formosa , is an island situated in East Asia in the Western Pacific Ocean and located off the southeastern coast of mainland China.
Taiwan comprises most of the territory controlled by the Republic of China since 1949...
ese electrolyte manufacturers began using a stolen formula that was incomplete, and lacked ingredients needed to produce a stable capacitor.
The first flawed capacitors were seen in 1999, but most of the affected capacitors were made in the early to mid 2000s, and while news of their failures (usually after a few years of use) has forced most manufacturers to fix the defects, some bad capacitors were still being sold or integrated into designs .
When a faulty capacitor is charged, the Water is a chemical substance with the chemical formula H2O.
Its molecule contains one oxygen and to hydrogen atoms connected by covalent bonds.
Water is a liquid at ambient conditions, but it often co-exists on Earth with its solid state, ice, and gaseous state, water vapor or...-based electrolyteElectrolyteIn chemistry, an electrolyte is any substance containing free ions that make the substance electrically conductive.
The most typical electrolyte is an ionic solution, but molten electrolytes and solid electrolytes are also possible....
becomes unstable and breaks down, producing Hydrogen is the chemical element with atomic number 1.
It is represented by the symbol H.
With an atomic weight of , hydrogen is the lightest and most abundant chemical element, constituting roughly 75 % of the Universe's elemental mass.
Stars in the main sequence are mainly composed of hydrogen Gas
Since these types of capacitors are sealed in an aluminium is a silvery white and ductile member of the boron group of chemical elements. It has the symbol Al and its atomic number is 13.
It is not soluble in water under normal circumstances....
casing, the pressure builds up within the capacitor until either the flat metal top of the capacitor begins to bend, or the rubber sealing plug is pushed down.
Eventually the pressure exceeds the strength of the metal casing and venting occurs, either by blowing out the rubber bottom of the capacitor, or bursting the scored metal vent on the top of the capacitor. When an electrolytic capacitorElectrolytic capacitorAn electrolytic capacitor is a type of capacitor that uses an electrolyte, an ionic conducting liquid, as one of its plates, to achieve a larger capacitance per unit volume than other types. They are often referred to in electronics usage simply as "electrolytics"...
bursts, effects can range from a pop and a hissing noise to a small explosion. Venting is typically messy, and the corrosive electrolyte must be cleaned off the motherboard to prevent further damage.
During those years the caps went into almost every device used Today.
Computers,Tvs,Power supplys Etc.
Even if the cap isn't domed,vented or Bulged, it still may have a high ESR!!
Needs to be measure with the correct equipment or just replace!!
Whens it's cold it may check good, need to warm it up alittle,measure it again!
Even surface mount caps suffered a problem going thru reflow oven as they were
soldered to the pcb,it damaged the rubber seals,causing them to dry up the Electrolytic inside.
The root cause of failure for bulging Taiwanese capacitors has been hypothesized to be dissolution of the aluminum into the electrolyte due to poor phosphate-electrolyte balance, rather than the normal evaporation of the electrolyte that all such capacitors undergo. This hypothesis has been confirmed by analyzing the electrolyte using energy dispersive X-ray spectroscopy (EDS), which confirmed the presence of dissolved aluminum in the Taiwanese capacitors' electrolyte, but not in Japanese ones, and by electrical testing, which confirmed a thinning of the dielectric, because the capacitanceCapacitanceIn electromagnetism and electronics, capacitance is the ability of a body to hold an electrical charge.Capacitance is also a measure of the amount of electrical energy stored for a given electric potential.
A common form of energy storage device is a parallel-plate capacitor...
increased before failure, rather than the normal decrease thorough electrolyte evaporation. The industry standard test failed to capture this behavior, likely because the high voltage used in the test significantly retards the dissolution, whereas it occurs faster at the production environment voltages.
Actually its a good thing,we are getting work out of it, in all types of trades..
Most just vent slowly,causing a slow death and no blown fuse's Or damaged diodes,transistors Etc
I know this is Old Info,but its just a reminder that we need to check them before we
throw in the towel and give up on the board,just because its cheaper now..those
dam video cards are not cheap i seen a few in them.
I got this info at a website,just to have alittle better details of WHY they are failing
like they are..if you like to know more,research the Title.
Electrolyte caps have always failed, but not like these because they were made wrong..
Things to know and watch out for.
I have the tech's just bring in the Mother boards/ video cards,lcds in before they fail
when its a slow time durig the year,for preventive maintance.
Because they will fail!! different brand caps too.
Any BAD Experinces with these or other Electrolyte caps in the past?
Anyone?
