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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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HV does not come on for Daytek 1731-D monitor?
I don't think the HV is coming on. No static sound as it fires up and
screen stays black. Just hear a soft ...tic, ...tic, ...tic, two a second my guess is the circuit trying to 'kick start' the HV oscillator Anyone have experience with this monitor? Or, what is likely culprit? Or knows what usually goes wrong? The MOSFET that drives the HV transformer? Schematic is VERY difficult to read, too This monitor has the best red phosphor I've seen and would like to get it up and running again. Help.please - Robert - |
#2
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HV does not come on for Daytek 1731-D monitor?
my experience is that this happens when the HV transformer is shorting
internally or to ground; the HV never reaches full potential, thus is a black screen. the tic is when the HV tries to build and reaches a value high enough that leakage occurs. try dark room to see if you can see visible arc outside of tranny; if not, the leakage is internal. wrote: I don't think the HV is coming on. No static sound as it fires up and screen stays black. Just hear a soft ...tic, ...tic, ...tic, two a second my guess is the circuit trying to 'kick start' the HV oscillator Anyone have experience with this monitor? Or, what is likely culprit? Or knows what usually goes wrong? The MOSFET that drives the HV transformer? Schematic is VERY difficult to read, too This monitor has the best red phosphor I've seen and would like to get it up and running again. Help.please - Robert - |
#3
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HV does not come on for Daytek 1731-D monitor?
nucleus wrote: my experience is that this happens when the HV transformer is shorting internally or to ground; the HV never reaches full potential, thus is a black screen. the tic is when the HV tries to build and reaches a value high enough that leakage occurs. try dark room to see if you can see visible arc outside of tranny; if not, the leakage is internal. Afraid you may be right. ticking is now up to 4 times a second. Neglected to mention that recently now and then the monitor would make a sound, zzziiiitttt and tthe image would get small and pull way to the right, then another sound and return to normal. Not often, just once in a while. Thought that was topical contamination buildup, so I disassembled, cleaned as possible, reassembled and hasn't done that for some time, but has done it again. Confusing the issue is the intermittent pot controlling the blue gun. One of 3 of those really really cheap pots on the PCB on the neck seems to go open and loses the blue gun. Tap slightly and it comes back. Very difficult to remove that board, it's glued on, and soldered into the RF Shielding. Will do that dark room test. May be imagination, but swear the unit has been running hotter than originally. Does that relate? Robert |
#4
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HV does not come on for Daytek 1731-D monitor?
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#5
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HV does not come on for Daytek 1731-D monitor?
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