20 Most Recent Sharp 20F640 20" TV Questions & Answers

If you wish to get more details, check this link. http://electronicshelponline.blogspot.com/ Selecting the view option, either to Mosaic / Time slide, can be selected by the drop-down list, at the top left of the display window, will make surf easy. You can also do a search, by type in the brand name/model number/IC used, in the search box at the top right of the display window.

Sharp 20F640 20"... | Answered on Oct 13, 2013

Look for any loose solder terminals at its main power regulator circuit section. Re-solder all suspected solder terminals, by applying a little more solder to each terminals. If you wish to get more details, check this site. Pull up older posts there. Check the site with patience, as it has over 2350 posts now. All are related to electronic equipment repair help. Search the site by 'Timeslide' option. It will make search easy.

Sharp 20F640 20"... | Answered on Apr 22, 2013

you need to use red blue and green component cable to connect this to a hi definition player. hdmi to analogue is not possible without expensive circuitry as well i know you can buy hdmi to phono leads but they will not work for this kind of application. what outputs does the blue ray player have?

Sharp 20F640 20"... | Answered on Jan 11, 2013

At the rear of the tv there may be two controls on the right hand side marked "screen" and "focus".If the set is newer,you will have to remove the cover and look to your right.You will see a dark object with a black or red wire coming out of it's top.That is your flyback transformer.On this you will find these two controls.Adjust your focus with the one so marked.Be careful to only adjust this control while you watch your picture clear.PROMPLY put the cover back.

Sharp 20F640 20"... | Answered on Aug 28, 2011


An outdoor antenna is more better than indoor antenna. If we fix an indoor antenna, especially in rooms in a flat type structure buildings, due to its iron network structure reinforced inside its concrete will oppose a considerable obstruction to tv signals to get through. Moreover, if any paerson walk through these telescopic type antenna, picure will get shiver of it will be distrurbed.

So buy an outdoor antenna, and hoist it at suitable place, where there are no obstructions comes between the signal path of the transmitter and the antenna. Get an antenna, whcich has as many as cross elemets, if it is a yagi type. As number of elements increses, the sensitivity and seletivity of the antenna will also increase, resulting in good and detailed picture clarity. OK

Sharp 20F640 20"... | Answered on Nov 30, 2010

sharp 21sl71w

Sharp 20F640 20"... | Answered on Aug 16, 2008

Most places listed "1 tuner" in specs. Was finally able to find a site where it listed the type of tuner which confirmed that it was not HD compatible. That was all I needed. Sorry I troubled you with this, I shouldn't even have been on your site with this Q. Thanks for responding. Potter1

Sharp 20F640 20"... | Answered on Apr 26, 2008

Good day. It would have been a different scenario if the problem is your tube. The one that your having is a mere problem with the loose contacts in your units circuitry. Also, the terminals of your deflection yoke must be reoldered..


Sharp 20F640 20"... | Answered on Mar 29, 2008

first check speakers if ok then replace audio output chip.

Sharp 20F640 20"... | Answered on Jan 18, 2008

The "cricket" sound you heard can mean any number of things:

1. A component in the power supply that sets the frequency failed, causing a high frequency (hence over-voltage) in the SMPS, which then also failed. The initial failure may have occurred in a small high-voltage capacitor in the power supply (around 160V or so rated)

2. A failed horizontal drive or vertical stage, which drew so much current that the switching semiconductor in the SMPS failed.

Note that such failures often occur like dominoes (one, then two, then three, and so on). Sometimes the fuse itself will not even blow out. The best thing to do is to first remove the line-output transistor and then replace the switching semiconductor(s), nearby zeners, capacitors, and fuse if blown. Then turn the unit on and check for about 105V on the collector terminal of the line transistor. If that's fine then turn unit off, replace the line transistor.

Of course the above procedure is only a guide; the precise steps taken will depend on your exact make and model. Also, if the above sounds mind boggling then rather take it down to your nearest repair shop. Good luck.

Sharp 20F640 20"... | Answered on Jan 18, 2008

your power supply must have gone defective due to some parts failure. if it is ok check horizontal section.

Sharp 20F640 20"... | Answered on Sep 22, 2007

If you wish to get some details; check the site linked here. Pull up older posts.
Circuit diagrams of many popular brand TVs and other devices are given.

Sharp Televison... | Answered 3 days ago

Not finding what you are looking for?
Sharp 20F640 20" TV Logo

Popular Tags

13 questions posted

Ask a Question

Usually answered in minutes!

Top Sharp Televison & Video Experts

The Knight
The Knight

Level 3 Expert

76115 Answers

Jaime Hernandez

Level 3 Expert

2337 Answers

Cindy Wells

Level 3 Expert

6004 Answers

Are you a Sharp Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

View Most Popular

Sharp Televison & Video

  • Sharp Televison & Video

Most Popular Question


  • Televison & Video