JVC AV-48WP74 convergence
I have a JVC AV-48WP74 rear projection big screen. It has convergence problems. I've changed convergence IC's before and this time it is not working out for me. I have put in two sets of brand new convergence ICs and they have had the same out come. It will not power up, the power light just flashes but if I put the original ones back in, it powers up fine. The convergence is off but it powers up. I've changed any bad resistors but if the original ones work then that cant be the issue. My supplier said that he could send me new ones but he doesn't think that it would solve the problem. What could the problem be?
Televison & Video - JVC - AV-48WP74 48" Rear Projection HDTV-Ready Television
Answers & Comments
The ICs are most likely defective if the old ones allow the set to power up.
Use pin 1 or 2 for ground then test pins 3 and 4 for- 27.1 to -28.1V thats the supply volts. Then pins 8,12 and 17 for -28.8V and Pin 10 for 28.5 volts. Those are the output volts. Check both ICs that way.
If the input volts are correct but the outputs are not then the ICs arent functioning