Cornerstone Monitor - missing blue color
I'm trying to repair my cornerstone monitor which is missing the color blue.
I've tracked it down to a driver chip (I think) - VPS10 (CRT Display video amplifier) If I disconnect the input pin (pin 10) the signal is the same shape as the other two colors - red and green. The moment I connect the input back the amplitute of the signal almost halves. I've checked the output pins as I thought it might be pulling the input down - but no go. All resistors/caps/diode check out ok. Does it sound like the chip is faulty - is this a common fault? Can anyone recommend a replacement - the local exeltroniucs shop doesnt stock them :( |
I would try the IC at the point where you are, and from your description. I
have not serviced the particular make and model of monitor you have, but have had similar experience with others. -- Jerry G. ====== "John Dough" wrote in message ... I'm trying to repair my cornerstone monitor which is missing the color blue. I've tracked it down to a driver chip (I think) - VPS10 (CRT Display video amplifier) If I disconnect the input pin (pin 10) the signal is the same shape as the other two colors - red and green. The moment I connect the input back the amplitute of the signal almost halves. I've checked the output pins as I thought it might be pulling the input down - but no go. All resistors/caps/diode check out ok. Does it sound like the chip is faulty - is this a common fault? Can anyone recommend a replacement - the local exeltroniucs shop doesnt stock them :( |
They do have a history of fail, you can purchase he http://www.ljecc.com/
"John Dough" wrote in message ... | I'm trying to repair my cornerstone monitor which is missing the color blue. | | I've tracked it down to a driver chip (I think) - VPS10 (CRT Display video | amplifier) | | If I disconnect the input pin (pin 10) the signal is the same shape as the | other two colors - red and green. The moment I connect the input back the | amplitute of the signal almost halves. I've checked the output pins as I | thought it might be pulling the input down - but no go. All | resistors/caps/diode check out ok. | | Does it sound like the chip is faulty - is this a common fault? Can anyone | recommend a replacement - the local exeltroniucs shop doesnt stock them :( | | |
Thanks - managed to source a chip - replaced it, and it works like a bomb!!
"Techforce" wrote in message ... They do have a history of fail, you can purchase he http://www.ljecc.com/ "John Dough" wrote in message ... | I'm trying to repair my cornerstone monitor which is missing the color blue. | | I've tracked it down to a driver chip (I think) - VPS10 (CRT Display video | amplifier) | | If I disconnect the input pin (pin 10) the signal is the same shape as the | other two colors - red and green. The moment I connect the input back the | amplitute of the signal almost halves. I've checked the output pins as I | thought it might be pulling the input down - but no go. All | resistors/caps/diode check out ok. | | Does it sound like the chip is faulty - is this a common fault? Can anyone | recommend a replacement - the local exeltroniucs shop doesnt stock them :( | | |
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