Quote:
Originally Posted by Lain94
Preface:
I will admit that I did a major goof up awhile back when I was removing the boards for recapping. I had accidently while being in a hurry and not paying close attention accidently put one of the boards on the wrong way (right orientation but shifter to the right by one pin margin to where one pin was not connected and the others shift over by one). I realized this mistake when turning on the tv and not getting vertical deflection and smelled a horrid burning smell emanating from the tv. I quickly turned it off and fixed the mismatched board and all seemed to be well after that....for awhile. Unghh well I am not making that mistake ever again.
I used my CRT tester on this tv as well. No shorts in the CRT were found and WOW are the color guns strong. This tv was certainly not used much. Sadly, I ran into another issue with this tv recently when I tried to turn it on and adjust purity and convergence for it.
First off I am not longer getting vertical deflection just a horizontal line. But it gets worse, I turn the tv off quickly and after inspecting the tv I notice a burnt/shorted carbon comp resistor (I tested it to verify it was bad) The resistor was on the horizontal output board just above the high voltage cage which houses the flyback. So I replace the resistor with a high quality metal oxide resistor of appropriate wattage and value.
I turn the tv on again and this time I get nothing at all, no filament being lighted up even. Just the hum coming from what I think is the high voltage area. This leads me to believe the issue is regarding the voltage somehow being low or off due to a bad winding in the flyback or perhaps the Double or tripler went bad.
I don't have a high voltage probe yet to test the voltage output so verifying voltage output will have to wait. I did try resetting the circuit breaker switch which I am unsure of if it actually tripped. This did not fix the issue.
I am at a loss at this point as to what may have went wrong exactly.
|
I don't know this model, but some things I wonder if occurred:
I'm have the impresion that the inverted board can be shorted with the inversion since (is the vertical output one?), when you changed the burnt resistor, the TV cannot work anymore. I wonder if this board don't have making shutdown or blowing fuses on TV (or messing with driver/oscillators/controllers).
Certain TV models derive vertical power from flyback, also, to be in mind.