Why does my 64 only say no signal on the t.v.

My 64 only shows a no signal sign on the t.v when it is turned on. I've cleaned the converter pack and the games and replaced the video cord and still nothing.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0

crwdns2942205:01crwdne2942205:0:

Open it up and check all the solder joints around the output are good.

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

crwdns2934285:0crwdne2934285:0