I have a sharp image/kortek monitor from a showcase chassis identified as a KTM-F model. Here is what I have done so far:
1) no power, no picture. 120 volts are coming into the monitor.
2) checked the power supply, D901 and R604 and R605 for faults. All test fine
3) upon visual inspection, there is a burnt resistor by the flyback, R907. upon further inspection, R907 and R905 are soldered together, and there are some obvious 'hacks' to make up for burnt traces. Upon pulling the resistors, R907 tests fine (1kOhm) and R905 is open. D904 (connected in series) tests fine.
Upon looking up a schematic, (http://technical-department.servegame.com/monitor_schematic_diagrams/sharp_image_si134.jpg) I notice both of these resistors should be 47k ohm. I'm assuming I should replace with original parts, even though one of the resistors is obviously a 1kOhm resistor. The other looks to be under wattage (very small) anyway.
If anyone knows of a fix or why a 1kOhm was in place of a 47K ohm, I'd love to know. Otherwise, I'll pop in the two 47K's and let you know what happens.
1) no power, no picture. 120 volts are coming into the monitor.
2) checked the power supply, D901 and R604 and R605 for faults. All test fine
3) upon visual inspection, there is a burnt resistor by the flyback, R907. upon further inspection, R907 and R905 are soldered together, and there are some obvious 'hacks' to make up for burnt traces. Upon pulling the resistors, R907 tests fine (1kOhm) and R905 is open. D904 (connected in series) tests fine.
Upon looking up a schematic, (http://technical-department.servegame.com/monitor_schematic_diagrams/sharp_image_si134.jpg) I notice both of these resistors should be 47k ohm. I'm assuming I should replace with original parts, even though one of the resistors is obviously a 1kOhm resistor. The other looks to be under wattage (very small) anyway.
If anyone knows of a fix or why a 1kOhm was in place of a 47K ohm, I'd love to know. Otherwise, I'll pop in the two 47K's and let you know what happens.