The problem started with sound but no power. I have some experience in this area, and removed the board and checked all the solder and relaced one area now I have pic. but it is barely visible and there is red,green,and blue lines zig zagging across the whole screen. any suggestions???
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Unfortunately you will need an experienced TV tech. This unit will need 2 ICs STK392-110 for 1 has shorted and caused damage to the 2nd as a result blowing 1 or 2 pico fuses in the power supply. It is an involved job and may be somewhat costly depending on the pricing in your area. Hope this helps
Sound like you lost Vertical Deflection.Youshould not have a line across the screen because this could destroy the threeCRT Red, Green, and Blue (Picture tubes) if left on to long.There is a protection circuit built in to protect your CRT’s.Check on the PCB-SIGNALboard (Tuner located on this board) transistors Q-206 Collector should be around 1 Volt Base and Emitter 0V. If the voltage atthis point is greater then 5 Volts the Vertical output IC-401 (Mounted on heat sink 7 pin inline IC) is bad, Part # LA7845. Pin Voltages should be PIN 1= 0V, 2= 34V, 3= 32V, 4= 3V, 5= 3V, 6= 33v, 7= -6V. Data sheet located at http://pdf1.alldatasheet.com/datasheet-pdf/view/40357/SANYO/LA7845.html
The part you are describing is actually the red picture tube, not a lamp. The tube will come dry and you will need to disassemble the lens assembly on the old tube, drain the coolant (antifreeze), reassemble the parts and seal on the new picture tube, fill with fresh coolant, install the new tube, reconnect all wires including the dangerous high voltage lead, then realign the yoke and entire convergence circuits. This is not something that should be attempted by anyone without experience. If you try it yourself and the seal is not working perfectly, the coolant will drip down on your main boards and the set will be ruined. If you slip while lowering the new tube in the chassis there is a good chance you will crack the tube's neck, and that tube will be useless too.
This sounds like one of the 9 volt regulators on the small signal board is going bad, supplying less than 8 volts. I have seen this is several of those sets. The IC needs to be replaced and if you do not have experience in servicing projection TV's then I suggest letting a qualified tech handle it for you.