Sharp primo 21V-W70M service manual

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.

http://electronicshelponline.blogspot.com/

Unlock procedure and to override the password lock to many popular brand TVs are given.
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.

https://www.google.com/search?q=sharp+tv+21V-FK200M+Password

Service Manuals

https://www.google.com/search?q=sharp+tv+21v-fk200m+service+manual

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Check whether the audio is muted by accidental press at remote control button. Enter its sound menu, and check it. If muted, as you know there will be no audio output. If not muted, check the speaker/s. If found OK; check and replace the damaged component/s at its audio output section circuit board. If needy, replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/
Check the voltage goes to audio amp circuit section.
Check speaker/s [If there is two speakers, both of it should be checked for coil continuity]
Check whether the audio is muted.
If all these are OK, check and replace the audio output IC.

http://elektrotanya.com/sharp_20lk31_20lk61_chassis_sn-70a.pdf/download.html

Try asking in English without all the acroknyms. I do not recommend opening one up and repairing it yourself.

Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
Do a search by type in the brand name of your device at its search box.

Short circuited component at its main board. Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
Give a special attention to its horizontal output transistor. Replace it, and check. Check this device for collector to base, or collector to emitter leak. Even a slightest leak, will cause sivere problem.

Check the input voltage to IC. If it is absent, the IC won't work. If you wish to get some details, check the site linked here. http://electronicshelponline.blogspot.com/ Pull up older posts.

TV sharp premo ret race line model no 20 W 70M

These sets are quite outdated, there are fewer and fewer repair shops out there for them.
The problem is most likely the power supply (internal), this can be repaired quite simply if you know what to look for. Other problems may or may not include a blown IC, fuse, lamp, or the tube itself.
The cheapest option you've got is to buy a new TV I'm afraid.

check the regulator maybe its busted