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Re: good picture but no sound
Confirm it's faulty... Check your menu to see if there is an option to turn internal speaker on or off, it may be off... It may also be called "Internal Mute"... you can also check if you are getting sound output through the headphone jack.
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It sounds like a shotgun estimate to me--those are Sony part numbers for circuit boards--Google each number to see if available. Also Google the model number with "parts".
I have heard this song before--some shops only want to collect some money and are not interested in fixing the set.
A way out for them is to say part not available---If they only looked at the set in your home that is not good enough--a complete exam would require it being in a shop with the proper test equipment to really see if 2 boards need to be replaced--also in a shop they might be able to find something that cannot be found in the home.
Keep in mind (our shop) that the techs in the shop (the top ones) rarely go to the home---you usually get a less experienced tech there.
Do some research and if find the boards are available point that out to the shop you had out and let Sony know about this.
With no sound and no picture it would not be the INVERTER, (no such part as "converter") You have a main board problem and it would cost around $300 to fix. These flat panel sets only last about 2 years, as much as they cost! You need to get a older type CRT television, pawn shops, tv shops, and yard sales have these, they are made much better than these newer sets and last 10 to 15 years or more. They also can be cheaply repaired when they breakdown.
That usually indicates that the power section driver board (one of them) has failed on you.There are three boards each of which can fail and cause this. Usually it is the Y or Z board.
Bad news is to know which one you need to be able to test inside the tv. Good news is the boards are fairly cheap around $35. So you probably will have to take it to a repair shop to get it fixed. Unless they really try to do a number on you as far as prices it is worth fixing. However be a bit cautious here and get and estimate and find the price of a new tv. If the markup on the parts and the labor gets close to the new tv cost then you will need to decide if it is worth fxing or replacing. Ie used tv or new tv with warrenty.
im not a pro but in my case the sound was there but the picture was not. i just took off the back of tv ,removed the blacklight protective cover removed the backlight board(long board left side of tv ) reconnected it without the metal cover and tv works as good as new. i got it fixed to at the repair store and one week later it started again i paid $197.40. just when i got ready to buy a new tv i took it apart and saw it was not hard to put it back together. saved alot of money $197 for repair and $1400 on the one i would have bought .
Well i have the same tv , and when i took it apart i switched a few wires around and i managed to get it working again, i can send some pictures of what i did because, i really had no clue what i exactly did by switching the wires.
On alot of these Toshiba TV sets, there is a fuse called F860 that will blow and the light will flash because of bad solder connections on C 810, and C 809, on the negitave terminal. I have seen many of these boards condemed by non-authorized Toshiba repair shops. Good Luck