Hi
There are many causes for a black screen on LCD's.
- Power supply failure
- Main board failure
- Faulty inverter board or CCFL failure
You do not give much detail about everything that can be observed without opening the unit: Does the front LED power on and stays on?
Does it switch to standby instantly?
Is there any sound other than the "clicking" you have mentioned? How about TV programs audio?
If I understand correctly, you can get the unit to power up by using a hairdryer??
If that is the case the fault may very well be a loose connector or a broken track. In some instances the heat expands and flexes the circuit boards, restoring the connection and you get a picture. Why not try instead gently tapping the boards with the handle of a screwdriver to see if you can get a picture that way. If you do there is your answer.
Where did you read about the use of a hair dryer?
It should NOT be used!!! Heat is the enemy of electronic components in particular IC's and capacitors, it shortens the life of IC's, dries capacitors rendering them useless thus making repairs more difficult and costly.
Hope this helps.
I have the same problem with a Samsung pn43d450. The problem with mine was 2 blown 1000mFd 25v hi-temp capacitors. The clicking sound is a relay switch turning on and off. I ordered 2 new caps off eBay for $2.00, desoldered the old ones and replaced.
I only reccomend this if you have basic soldering skills, own a slider sucker, are smart enough to unplug the TV first and can visually identify a capacitor that is "puffed" or "blown". Otherwise pay someone or order a complete board to replace.
Personally I would check out ShopJimmy.com for a replacement power supply board. what u are doing sounds dangerous. I would not feel safe with it plugged in to an outlet all the time. The boards are fairly easy to replace. just be careful the Caps can hold a powerful charge. The board usually run from $30 to $100+ still cheaper that a new TV. I have fixed several here lately. When u get the back of the TV off and can see the power supply board, Take several pictures of it so you won't forget how to re install the new one.. also get a close up of the part number off the board itself. It is usually on the bar code sticker. This will save you time. And don't remove the old board till u have the new one on hand.Hope this helps.
Fault with main board. Damaged component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
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