No picture just get a white screen. Can it be reset somehow?
You haven't mentioned, whether there is sound is Ok or not. Anyway, according to your description I understand that there is no sound too. Assuming this I advice you to replace its tuner. If there is only a white screen, that is a raster only with no grains, tuner or chroma Ic may in trouble. In your case it may be chroma Ic itself. If chroma ic fails there will be no grains. In most of the modern TVs One Chip Micom is used. That 90% of tha sections are integrated to one Ic. Video If, Chroma, vertical and Horizontal Oscilator, sync: circuits, System Control etc. If any of these section inside the said ic fails, replacement of that Ic is the only remedy. You just check the chroma Ic first. If it is fauty, it will heat up more, such that we can't touch it. It will be heated upto 50 to 65 degreeC during operation. But not more. To check this, open the back cover of the Tv, locate the said Ic [it will be larger in size normaly have more than 50pins of connections on both sides; say it as DIL type, means Dual In Line], switch on the tv; without touching its any internal parts, wait for two or three minutes, switch off the set and plug out the mains chord from wall socket; and just touch it with your bare fingers and feel the heat effect. If it is too hot that you can't touch it; it is the faulty. Be caucious during this process. Never touch it with power supply is energised. Keep the power plug out from the socket, before doing anything inside the Tv and keep the children away from you.
Oct 17, 2010 |
Haier HLT71 7 in. Portable TV