Repair of Electronic choke for 4'tube light

I tried to repair two electronic chokes for 4' fluorescent tubes but cdn't succeed. If any one kindly help me by providing a step by step guide with the test voltages etc. at important points in the circuit, I will be ever grateful. The following things have been already done/checked. Physical checking of any defect/damage/burning marks etc., DC voltage after rectification is OK, Filter capacitor (DC voltage  after rectification ) is checked OK, Other electrolytic capacitors chked to be OK, one of the 13005 transistors was found defective - changed with a new one, but no result. Voltages at the transistor terminals seem to be OK.. May pls write to me directly.

B.N.Bhattacharya
bnber_2004@yahoo.co.in


Downunder35m8 months ago

Sorry, but my crystal seems to have problems getting me an image of the affected electronics.....