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China MIN DONG TV-MD 14/22 repair
perjmolsen:
--- Quote from: princess prin prin on January 13, 2019, 12:25:06 pm ---Don't connect the jumper yet. Do the lightbulb test at the HOT collector (with HOT out of circuit). If you have steady light and b+ voltage put the HOT back in and reconnect the jumper and test the chassis. Don't keep the yoke connected to the chassis.
The horizontal inductance on the label seems quite high for the resistance. I would expect it to be half of that.
--- End quote ---
OK :)
Status.
1. I connected the light bulb to the middle leg at the hot (with the HOT out) - NO light 0V
2. Put solder on the yellow marked pin at the flyback, so it now where solder in, still with connected light bulb to middle pin at the HOT (still with the HOT out) - A light for 1 sec came on.?!? but when out quickly If i tried a second time to turn on no light - only light for at short time the first time i turned it on.
3. Removed the solder at the yellow marked pin at the flyback, moved the wire to the pad of the yellow marked pin at flyback - and i still have 113V...
What do that tell?... is my flyback dead?
princess prin prin:
Measure the resistance across middle pad of the HOT and ground. Is it very low/zero ohm?
perjmolsen:
--- Quote from: princess prin prin on January 13, 2019, 03:08:20 pm ---Measure the resistance across middle pad of the HOT and ground. Is it very low/zero ohm?
--- End quote ---
Yes OL/zero ohm between middle pad at HOT and the ground
(when testing i have not solder the yellow marked pin)
princess prin prin:
Suck solder off the flyback pin connected to the middle pad of the HOT, i.e. the pin just below the yellow one. Then measure resistance across that pin and ground. If it's 0 ohm the flyback is bad (primary and secondary windings are shorted). If the resistance is very high/infinite, measure the resistance across the middle pad of the HOT and ground.
perjmolsen:
--- Quote from: princess prin prin on January 14, 2019, 03:35:02 am ---Suck solder off the flyback pin connected to the middle pad of the HOT, i.e. the pin just below the yellow one. Then measure resistance across that pin and ground. If it's 0 ohm the flyback is bad (primary and secondary windings are shorted). If the resistance is very high/infinite, measure the resistance across the middle pad of the HOT and ground.
--- End quote ---
Hi
Well both are reading OL (and i have checked that there is ground to the point) :)