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either is sound IC has blown, or the sound section of the tuner needs a repair. I have repaired many tuners for sound. Some technicians never repair a tuner hence it would need a replacement if it can be physically removed. If a tuner is printed on the main board the whole board may need to be replaced.
Its problem of convergence board and need to be replaced. You can buy this board at Part Store.
Please replace the board if you have basic electronics knowledge or get help of tech person.
Sounds like you have a tuner or intermediate frequency amplifier problem. This would be on the main board. The tuner is were the coax connector is hooked up. I would change the main board that has the tuner on it. The intermediate stage (amplifiers) will be on this board as well. Did the set get wet? If moisture got in the tuner it will act the way you described.
It depends if the connector broke the tuner it is attached to. Most times the chassis of the set would need to go into the shop. I would generally charge $80.00-$120.00 if the tuner was still good - a new tuner would cost $60-$100 more if bad
The better solution is to use the video audio inputs (if on satellite or cable box) or use the video inputs by changing channels through the VCR (if on cable or antenna and a VCR is available)
whats wrong with the old tuner? did the connector break? depending on the damage the connector can be replaced to replace the tuner right out i would call a medium difficult level. it invovles removeing the signal board the board with the tuner on it simply unsoldering and replacings care should be taken not damage surface mounted components. at the shop it is possible we repair these tuner which involves opening the can tuner and soldering a new connector to the can of the tuner.
If you are decent with soldering iron you can repair it yourself. Remove the back, and remove the signal board from the unit. Unsolder the Tuner from the board( If I've lost you already, call a TV shop for repair) Remove the shields on the tuner and inspect for damage to the tuner itself. If the board is in good shape, replace the RF connector with RCA # 215543. you'l have to unsolder the old ends connector ( the wire thats still there broken ) from the board, then attach the new end, and solder to the board. Then using high heat, solder the Connector to the tuner housing. Replace tuner on board, hook everything back up, and you should be in business.
There is a fairly common problem with those symptoms. Try removing the srs-wow board, stand-up audio board next to the tuner. If the picture clears up it's likely QD01 on the srs-wow board loading down the scl & sda lines. QD01 is an Njm1136d Toshiba p/n# 23009142.