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Viewsonic 930b
any ideas why this monitor won,t work if the room temp is below 65 deg
Fahrenheit? Regards, Rene |
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Viewsonic 930b
"Rene Lamontagne" wrote in message
... any ideas why this monitor won,t work if the room temp is below 65 deg Fahrenheit? Last time an LCD monitor failed here, I was told: 1. Most brands are now made with components bought as cheaply as possible, viz. specifying minimum performance standards (rather than maximum possible standards of function, service life etc.) -- so that most cheap monitors now fail after two or three years. 2. LED monitors last longer than LCD monitors. Frequent replacement of monitors seems OK to most users because video quality is still improving every year. -- Don Phillipson Carlsbad Springs (Ottawa, Canada) |
#3
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Viewsonic 930b
On Feb 9, 9:41 am, Rene Lamontagne wrote:
any ideas why this monitor won,t work if the room temp is below 65 deg Fahrenheit? Regards, Rene It's due to negative thermionic residuals, of course, if contractual disparity exists below some applied higher tangent characteristic of presumptive operational modes. |
#4
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Viewsonic 930b
At Sun, 10 Feb 2013 11:24:12 -0800, Flasherly rearranged some electrons to
write: On Feb 9, 9:41 am, Rene Lamontagne wrote: any ideas why this monitor won,t work if the room temp is below 65 deg Fahrenheit? Regards, Rene It's due to negative thermionic residuals, of course, if contractual disparity exists below some applied higher tangent characteristic of presumptive operational modes. Or perhaps a positive amount of bull****. |
#5
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Viewsonic 930b
On 2/9/2013 8:41 AM, Rene Lamontagne wrote:
any ideas why this monitor won,t work if the room temp is below 65 deg Fahrenheit? Regards, Rene I've had to repair several Viewsonic monitors that had bad electrolytic capacitors in the power supply section. I replaced the factory caps with the same value except the new ones had a higher voltage and temperature rating. Another problem that will show up is cold solder joints, at a lower temperature, the metal parts, leads and solder on the circuit board can actually shrink and break a connection. If you have any experience repairing electronics or you have a friend who repairs gear down to board level, take a look at the circuit board where any through the board components are mounted, if you see cracks around the solder joints, that could be where your problem is. ^_^ TDD |
#6
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Viewsonic 930b
On Feb 12, 7:43 pm, The Daring Dufas the-daring-du...@stinky-
finger.net wrote: On 2/9/2013 8:41 AM, Rene Lamontagne wrote: any ideas why this monitor won,t work if the room temp is below 65 deg Fahrenheit? Regards, Rene I've had to repair several Viewsonic monitors that had bad electrolytic capacitors in the power supply section. I replaced the factory caps with the same value except the new ones had a higher voltage and temperature rating. Another problem that will show up is cold solder joints, at a lower temperature, the metal parts, leads and solder on the circuit board can actually shrink and break a connection. If you have any experience repairing electronics or you have a friend who repairs gear down to board level, take a look at the circuit board where any through the board components are mounted, if you see cracks around the solder joints, that could be where your problem is. ^_^ TDD No (in another sense). Go to an electronics supply house and buy a can of certifiably compressed Witch-Tit Air. While the components are up and running normally, try spraying it topically/regionally to isolate those same cracks (and most anything else otherwise thermodynamically prone to jumping over the wall). I once had one of those things upside down on a blanket, spread across the living room, for board replacements. It was big and nasty and had too many damn screws hidden inside a regular Chinese jigsaw puzzle. I've seen cold air used in electronics repair shops, though, which could be nice to know if one can't use it to duplicate expansion faults prior to going deeper into the disassembly. I do know that in my case, I must of shot off my mouth to the service/warranty dept. So, they inexplicably sent me a replacement board ... must've been based on inadvertent assumption of my self-professed expertise. When I couldn't fix the monitor, however, the next person I talked to said I oughtn't have done what I did, that free shipment for the return and replacement was standard policy. Nice ... the guy in service that sent me that board... quite the joker, eh... |
#7
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Viewsonic 930b
On 2/12/2013 9:39 PM, Flasherly wrote:
On Feb 12, 7:43 pm, The Daring Dufas the-daring-du...@stinky- finger.net wrote: On 2/9/2013 8:41 AM, Rene Lamontagne wrote: any ideas why this monitor won,t work if the room temp is below 65 deg Fahrenheit? Regards, Rene I've had to repair several Viewsonic monitors that had bad electrolytic capacitors in the power supply section. I replaced the factory caps with the same value except the new ones had a higher voltage and temperature rating. Another problem that will show up is cold solder joints, at a lower temperature, the metal parts, leads and solder on the circuit board can actually shrink and break a connection. If you have any experience repairing electronics or you have a friend who repairs gear down to board level, take a look at the circuit board where any through the board components are mounted, if you see cracks around the solder joints, that could be where your problem is. ^_^ TDD No (in another sense). Go to an electronics supply house and buy a can of certifiably compressed Witch-Tit Air. While the components are up and running normally, try spraying it topically/regionally to isolate those same cracks (and most anything else otherwise thermodynamically prone to jumping over the wall). I once had one of those things upside down on a blanket, spread across the living room, for board replacements. It was big and nasty and had too many damn screws hidden inside a regular Chinese jigsaw puzzle. I've seen cold air used in electronics repair shops, though, which could be nice to know if one can't use it to duplicate expansion faults prior to going deeper into the disassembly. I do know that in my case, I must of shot off my mouth to the service/warranty dept. So, they inexplicably sent me a replacement board ... must've been based on inadvertent assumption of my self-professed expertise. When I couldn't fix the monitor, however, the next person I talked to said I oughtn't have done what I did, that free shipment for the return and replacement was standard policy. Nice ... the guy in service that sent me that board... quite the joker, eh... I find most cold solder joints by visual inspection of a board and by wiggling components and watching the leads where they go through the circuit board. Freeze spray can actually damage some components if you're not careful with it. Thermal intermittent malfunctions can be the most difficult problems to find especially with large surface mount components. I have an Apple laptop that has a factory defect where the large surface mount video chip has defective solder connections under the chip. The repair is to heat the chip in order to re-flow the solder without damaging the chip. Regular canned air can be used to cool down circuit boards without drenching them with liquid refrigerant and a hair dryer or heat gun on the low setting can be used to cycle the circuit board temperature. I've come across all sorts of strange malfunctions in electrical/electronic gear caused by temperature changes during my work in the field over the past four decades and I still haven't seen everything but I've seen a lot. ^_^ TDD |
#8
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Viewsonic 930b
On Feb 12, 11:39 pm, The Daring Dufas the-daring-du...@stinky-
finger.net wrote: I find most cold solder joints by visual inspection of a board and by wiggling components and watching the leads where they go through the circuit board. Freeze spray can actually damage some components if you're not careful with it. Thermal intermittent malfunctions can be the most difficult problems to find especially with large surface mount components. I have an Apple laptop that has a factory defect where the large surface mount video chip has defective solder connections under the chip. The repair is to heat the chip in order to re-flow the solder without damaging the chip. Regular canned air can be used to cool down circuit boards without drenching them with liquid refrigerant and a hair dryer or heat gun on the low setting can be used to cycle the circuit board temperature. I've come across all sorts of strange malfunctions in electrical/electronic gear caused by temperature changes during my work in the field over the past four decades and I still haven't seen everything but I've seen a lot. ^_^ TDD You're making my ears hurt, even hearing it - heating chips to re-flow surface-mount wave soldering. Cut&dry PCB swap-outs is about as far as I've come. Do have an approaching-old 6L6 valved amp, though, that may be exhibiting problems. Not sure yet, as I've got to try a fresh matched pair, near-same specified tube substites for duplicating runaway idle currents in one tube position (electron collector plates eventually turn cherry red on questionable tubes of the same nomenclature). Right now I've some "class A" converters stuck up in there, direct base plug-in adapters for running entirely different characteristic tubes at half-reduced output wattages. Great little THD adapters that should be renamed to Can't Do No Harm. Anyway, I've had it apart, and after one look at the component assembly, "styled after" a '59 Fender Bassman couldn't be other than perfectly sensible. Be hard to find something simpler for wetting one's feet to a challenge in electronics (...schematics, tracing current flow, bulky capacitors with lethal voltages -- what more could one ask for?). |
#9
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Viewsonic 930b
On 2/12/2013 11:46 PM, Flasherly wrote:
On Feb 12, 11:39 pm, The Daring Dufas the-daring-du...@stinky- finger.net wrote: I find most cold solder joints by visual inspection of a board and by wiggling components and watching the leads where they go through the circuit board. Freeze spray can actually damage some components if you're not careful with it. Thermal intermittent malfunctions can be the most difficult problems to find especially with large surface mount components. I have an Apple laptop that has a factory defect where the large surface mount video chip has defective solder connections under the chip. The repair is to heat the chip in order to re-flow the solder without damaging the chip. Regular canned air can be used to cool down circuit boards without drenching them with liquid refrigerant and a hair dryer or heat gun on the low setting can be used to cycle the circuit board temperature. I've come across all sorts of strange malfunctions in electrical/electronic gear caused by temperature changes during my work in the field over the past four decades and I still haven't seen everything but I've seen a lot. ^_^ TDD You're making my ears hurt, even hearing it - heating chips to re-flow surface-mount wave soldering. Cut&dry PCB swap-outs is about as far as I've come. Do have an approaching-old 6L6 valved amp, though, that may be exhibiting problems. Not sure yet, as I've got to try a fresh matched pair, near-same specified tube substites for duplicating runaway idle currents in one tube position (electron collector plates eventually turn cherry red on questionable tubes of the same nomenclature). Right now I've some "class A" converters stuck up in there, direct base plug-in adapters for running entirely different characteristic tubes at half-reduced output wattages. Great little THD adapters that should be renamed to Can't Do No Harm. Anyway, I've had it apart, and after one look at the component assembly, "styled after" a '59 Fender Bassman couldn't be other than perfectly sensible. Be hard to find something simpler for wetting one's feet to a challenge in electronics (...schematics, tracing current flow, bulky capacitors with lethal voltages -- what more could one ask for?). The most common cause of problems I've seen in tube type equipment is the changing of component values due to the heat produced by the tube type equipment itself. I've found resistors and capacitors that were way out of spec. Of course in any old gear, the first thing to check is the electrolytic capacitors, they may appear to be fine looking at them but after so many years the things will dry out and cease to function. Heat kills. ^_^ TDD |
#10
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Viewsonic 930b
On Feb 13, 1:02 am, The Daring Dufas the-daring-du...@stinky-
finger.net wrote: The most common cause of problems I've seen in tube type equipment is the changing of component values due to the heat produced by the tube type equipment itself. I've found resistors and capacitors that were way out of spec. Of course in any old gear, the first thing to check is the electrolytic capacitors, they may appear to be fine looking at them but after so many years the things will dry out and cease to function. Heat kills. ^_^ TDD Go through it, measure and replace. Sounds like a good plan. |
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