Home |
Search |
Today's Posts |
|
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. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
Advice wanted: running crt filament w/extrnal power supply
I bought a $5, 20"monitor, it was on again/ off again. then it was off
again/off again. It's fairly new, and has about 10 parts/ square inch by the time the filament heater gets to CB w/ flyback, and I have no schematic, so.... I tapped off the CB w/ flyback and cut the original traces and am running to externally located bench PS, 6.00 volts, 0.4 amps, full floating, properly grounded, works fine. I also tapped off the power switch w/ intentions of installing a wall-wart power supply inside the plastic but outside the EMI shielding. I think that will be easier than finding the real problem, as the crt heater is marked plus and minus and when the monitor was working it seemed to drop to 5.3 volts when it went into energy saving mode. No bad solder joints on board visible. Any suggestions or warnings will be much appreciated. Thanks, Chuck Chandler Blacksburg, VA. |
#2
|
|||
|
|||
Advice wanted: running crt filament w/extrnal power supply
"Chuck Chandler" wrote in message ... I bought a $5, 20"monitor, it was on again/ off again. then it was off again/off again. It's fairly new, and has about 10 parts/ square inch by the time the filament heater gets to CB w/ flyback, Sorry for being dense, but what do you mean? Dave |
#3
|
|||
|
|||
Advice wanted: running crt filament w/extrnal power supply
I may work fine if you can locate a useable area to mount a filament
transformer within the existing case. Otherwise it would probably be better to actually find and repair the actual cause. "Chuck Chandler" wrote in message ... I bought a $5, 20"monitor, it was on again/ off again. then it was off again/off again. It's fairly new, and has about 10 parts/ square inch by the time the filament heater gets to CB w/ flyback, and I have no schematic, so.... I tapped off the CB w/ flyback and cut the original traces and am running to externally located bench PS, 6.00 volts, 0.4 amps, full floating, properly grounded, works fine. I also tapped off the power switch w/ intentions of installing a wall-wart power supply inside the plastic but outside the EMI shielding. I think that will be easier than finding the real problem, as the crt heater is marked plus and minus and when the monitor was working it seemed to drop to 5.3 volts when it went into energy saving mode. No bad solder joints on board visible. Any suggestions or warnings will be much appreciated. Thanks, Chuck Chandler Blacksburg, VA. |
#4
|
|||
|
|||
Advice wanted: running crt filament w/extrnal power supply
By usable area, he means one far enough away that the magnetic field from the
transformer doesn't affect the CRT image. That could be very difficult. Arthur Jernberg wrote: I may work fine if you can locate a useable area to mount a filament transformer within the existing case. Otherwise it would probably be better to actually find and repair the actual cause. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Telephone power supply noise | UK diy | |||
Digital Camera power supply | UK diy | |||
Advice on Domestic Electricity Supply 'Quality' | UK diy | |||
Generator Grounding | UK diy | |||
Power supply repair (Sun) | UK diy |