No sound from left hand channel,checked all connections, all secure. Tried different cartridge still no sound. Get all seven channels through my Denon amp so I don't think it's an amp problem.

There must be a bad connection or an internal amp somewhere inside the turntable then.

If you have disconnected the cartridge and touched the leads in that state and you had no sound out of the right channel, then there is nothing wrong with the cartridge at all. You either have a bad lead from the deck to the amp, or a bad connector to the amp. If replacing or fixing the lead does not correct the problem, then you have to look at the pre-amp in your amp as the cause. The amp will have a dedicated magnetic cartridge pre-amp. It's failure on the right channel will not effect any other function, such as tape or radio. You can easily find the cause, by tracing the phono connector wires back (inside the unit) to the first port of call on the PC board. You will either find a single IC doing most of the work of the pre-amp or two IC's, one for each channel. If you are lucky and a single channel IC does the work, replace the right hand one. Otherwise replace the dual channel one.

If you think it's the cartridge, then remember that putting the left channel connector on the right input of the cartridge should see no sound. But if you hear sound by switching the cartridge connections the cartridge is good.
I have noticed that you have tried another amp with the deck and it made no difference. This implies then a faulty lead between the deck and amps.

its an internal problem , take it to a tech and let them fix it. the board for the wx probably has jumped freq. and thats why you can't receive wx.

Actually it's not to hard to connect them. All you need is a stereo record where you know a sound of something is on the right or left channels. I use to have a Goodies LP where a one of them would say "bounce to the left" and the other said "bounce to the right" these coming on the respective channels.
To set it up just stick the red (right) on one of the cartridge pins and white - left on the opposite side - not underneath it. Then connect the other two to the pins below them. Play your test record. And if the sound which is supposed to be on the right channel come on the left - swap the two red and white wires around.
If the sound sounds (tinny spaced) out then swap the same side wires around.
So if you have say Red Green, Make it Green Red. If it is tinny only on one channel, don't switch the other channel around.
For example the right is tinny - do the above - but leave the other White Blue.
By the way some cartridges do have L and R marked on them and + and - for the channel types. " -" being for the green or blue wires.

Generally either a faulty connection to a lead or cartridge. Or a faulty Cartridge. If you switch the left and right channels of the phono leads the missing sound should move to the left and the right come to life. If it does not then there's a fault in the magnetic cartridge pre-amp in your amp.

One is earth for the right, one is earth for the left, one is right channel and the other is left.
You don't need to know the colours to find the left and right channels. Just connect the turntable to the amp switch on. Then with your finger touch each wire one at a time. One will buzz on the left the other will buzz on the right. You might even get a slight buzz from the two earths.
The cartridge might have the left or right channels marked so you can connect them, but if it doesn't just connect the left to one side and the right to the other, then do the same with the earths. try it out, if the channels are the wrong way round change them, if the sound doesn't sound right change them again and again till it sounds right. You won't damage the amp or cartridge from doing this. Unless it's some kind of static effected cartridge!

To find out what the problem is try this, swap over the right and left leads from the deck to the amp. If the problem stays on the left channel there's something wrong with pre-amp in your amp. If it goes to the other channel (right dead) it's the deck. Next remove the wires to the cartridge to the deck with the fault. Make a note of how they fit on the cartridge before you do. With the amp connected to the deck and on. Touch (one at a time) each of the four wires with your finger. Two of them will probably produce no sound. But from one wire you should hear a buzz on the left channel and from another wire a buzz on the Right channel. If you get a Buzz on the left speaker then all the connects are good and the cartridge has gone. If you don't get a buzz, then there is something wrong with the left cable connector between the deck and amp.

There are just two causes, one is the preamp, which can be easily checked by putting the right channel jack in the left terminal. If the sound is normal, then it's likely that the cartridge in the deck is bad, or some wire is loose. However if the sound is still poor then the magnetic cartridge preamp in the amp has a fault. These are normally a single IC, which will have failed. Find the preamp by tracing the wires from the imput socket to the PC board, which may be alone.

If you disconect the wires to the cartridge and with deck plugged in to the amp and switched on, you can touch the ends of the wires with your finger. Though there are four wires, only two should produce a buzz, one in the left, one in the right speakers. If you get a buzz in each channel, the rest of the unit is working fine and you have a faulty cartridge or a poor connection to it. If one channel remains dead, then you have a problem in the wires to your amp or an internal fault inside the deck. If internal I suggest you remove the bottom of the turntable and have a look around.

The first thing I would check has already been done, the only other thing would be fuses. I am preety sure there is a protection fuse at ever channels output to protect against a dead short. I am sure you have already fixed this problem but I thought I would give it a try. Let me know what you found.