I am currently the owner of two secondhand tvs - one is Hitachi C28WF56ON (CRT 28") The picture is very nice but the sound lets it down a bit. I was told it is around 2 years old and is still available to buy from comet.
The other tv is a JVC AV28T25EK with a silver stand that looks quite impressive but the picture is quite grainy even after tweaking with the picture menu. The blacks are very black indeed and I cant seem to grey them out a bit. However the sound on this set is wonderful.I was told it is 4 years old.
Please could anyone give me a pointer as to which tv is best to keep - any comments or help with a grainy picture would be most appreciated.
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after 4 or 5 yrs (depending on usuage ) in some TVs on mainboard & CRT tube's circuit board at some soldering joints cracks develops ... then due to loose contact TV behaves as you have described ........ when you are hitting that lightly on its side then these cracks at soldering joints are getting connected temporarly & for few seconds or minutes you are getting normal picture ....... so solution is most of the soldering joints on mainboard & on CRT circuit board has to be resoldered ....... only good tv service engineer can do this without shorting joints or damaging components..... so in your place contact few TV service engineers & ask them how much they will charge for resoldering joints on mainboard & crt tube's circuit board ......
if using digi-box its a scrat problem refit/replace. if your on stardard might be feed cable fault- remake and if none of these it's a sreen fault - require new t.v.or replacement- check with manufactor made need update
Sounds like U have an antenna or feeder problem. Get it checked out/ check it out. If in a strong signal area, try a simple indoor antenna for comparison. If in a marginal reception area, it could be your antenna is inadequate.
you have to get into the tv to do the adjustment. take the cover off and then look for the CRT tube and follow the yoke cables that will lead you to the printed circuit. you should see some small tiny knobs there. something like vertical phase or horizantl Phase..you need the verital to adjust the vertical size of the pic..good luck