Switching power supply for halogens does not go to generation?

Question

Power Supply

In short, as a result of a short circuit in a switching power supply for halogens (on two transistors), the diode bridge and transistors broke through. Changed diodes and transistors. The transistors pokotsalis and it was impossible to read which ones were there. I looked at the scheme, soldered field workers. I think it would be necessary to upgrade right away --- I stuck a ferrite ring more, the primary is a little thicker, the number of turns is about the same as in the native one. I removed the secondary, instead of it I made two secondary --- one for starting (3 turns with a thick wire to a 15 watt 12 volt light bulb), the other is a thinner wire about 15 turns. And working conders stuck a larger capacity. So, we approach the problem - it doesn’t start, with this 15 stubborn light bulb, when turned on, it starts working, but the generation fades out within half a second. In short, how not to jump with this winding, it does not want to start. Move on, the chain to another secondary load does not start, it was experimentally found that it works if a load with a resistance of less than 0.7 ohm is connected to it !!!. That is, it's almost kz. I hook a nichrome spiral - it starts up and the spiral instantly heats up and begins to sag. Transistors are cold. Koroch toiled toiled - I can not defeat this trouble. I need to run was from a 15 watt light bulb. And the second winding is already purely working. I tried to increase the number of turns in the windings on a small ring, which are pulled up to the bases of the transistors - doubled it - zero changes. What to do? I hook a nichrome spiral - it starts up and the spiral instantly heats up and begins to sag. Transistors are cold. Koroch toiled toiled - I can not defeat this trouble. I need to run was from a 15 watt light bulb. And the second winding is already purely working. I tried to increase the number of turns in the windings on a small ring, which are pulled up to the bases of the transistors - doubled it - zero changes. What to do? I hook a nichrome spiral - it starts up and the spiral instantly heats up and begins to sag. Transistors are cold. Koroch toiled toiled - I can not defeat this trouble. I need to run was from a 15 watt light bulb. And the second winding is already purely working. I tried to increase the number of turns in the windings on a small ring, which are pulled up to the bases of the transistors - doubled it - zero changes. What to do?