Crackling Noise On Bt Line
TV Basic Repair Guide Common Problems This post is for those who want to know the common problems that we will encounter in repairing Television set. I will be posting some common problems and their possible solution and tricks to repair this problem. CRT TV Circuit BoardMade In China Universal BoardDEFECT Single Vertical Line In The Center. POSSIBLE HINTS 1. Check first the vertical IC. Some Vertical ICs may have loose contacts on solder joints on its legs because of the heat and cold condition on its operation. Check the supply voltage if present in the main vertical section, sometimes 2. If the supply voltage is missing, check the line from flyback having 1. Defective yoke, maybe there is a broken or burn part of the coil inside it. If the supply voltage is present, possible problem is that the Vertical IC is defective or the Vertical Sync coming from the Jungle IC, better to check also the jungle IC in this situation. DEFECT HORIZONTAL LINE ONLYPOSSIBLE HINTS 1. Defective yoke, maybe there is a broken or burn part of the coil inside it. Loose contact connection on one of the legs of the yoke on the main board. Defective non electrolytic capacitor. DEFECT NO SOUNDPOSSIBLE HINTS 1. Check if the supply voltage for audio ampifier is present, if not check the line. If the supply voltage is present, try doing a hum test by touching the input of the audio IC, refer to the datasheet to find the input pin of the IC. Replace the audio IC if everything is done. DEFECT NO POWER POSSIBLE HINTS 1. Check first the power cord. If the power cord is ok, check the fuse note the fuse is burnt, dont replace it right away. Check first the circuit if their is a short on the circuit specially on the primary power section, check all the diodes surrounding the main power IC3. If their is no shorted diode and no short on main IC, now check the Horizontal Output if it is busted or shorted. Liked this post share it with your friends and peer 
