I have a 3 year old LCD HD Flat screen TV, about 6 months ago it started playing up while turning the tv on. A similar problem to what many people are having, where we switch the tv on, the blue light comes on along with the picture and the sound and then it switches itself back off and the red light comes on flashing. At first we did what everyone has done and that is switch the tv off at the mains for about 30 seconds and switch it back on, and this worked for a little while.
A short time later it was switching itself off more and more and it was taking approx an hour to get the tv to stay on until recently it just went off with the red light staying on and wouldnt do anything else. After looking online i also discovered that this was a common problem mostly caused by capacitors.
I took the back off the tv and noticed 6 bulging capacitors 4 with a black substance leaked out of the top. I de-soldered them, noted their values and bought exact replacements in terms of uF and temperature but with a slightly higher voltage as i discovered that many manufacturers of tv's fitted capacitors designed with a shelf life due to not being enough voltage to cope for long.
I de-soldered the circuit board where i took the capacitors out so that i could fit the replacement parts and did that last night, I replaced the plugs which connected the circuit board to the other boards which i had previously unplugged to get the board out of the tv.
Once I replaced the board and screwed the back cover back on to the tv i powered it up.
The tv ON light (Blue) came on along with the sound of the channel, it didn't switch off at all. But the screen stayed black, there is no picture. Sometimes when there is a black screen when you first switch on a tv you still see the small display in the top corner indicating the name of the channel (AV for example) but there is nothing.
If anyone else has had this problem i would really appreciate hearing from you if you have a fix for it, or if anyone has any idea of what could be wrong i will be very happy to hear from you. I have thought that it may be a dry joint (bad soldered joint) and have thought of taking them back out again and re soldering them in, but i am hoping someone else might have other ideas as i didnt realise how common a problem this is for people.
I paid £1000 for this tv and i cant afford another like it, and i think to have it repaired would cost me about £400, but i know that it is a part issue which would probably cost under £10 to buy and have delivered and fit myself. I cant afford £400 either!
If you can help me, please feel free to email me on LLYRSMITH@AOL.COM