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These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience.
I had AWFUL customer service. (Sherry is DREADFUL her # is 1-877-543-8325 she is in"executive services". Ask to speak to her directly...if you would like ZERO help.)
They WILL NOT extend the warranty, even though they know there is a defect with this AND other models. Zenith name on the front...LG guts in the inside. Ours turns on, screen black and then clicks three times and then turns back off.
3. When red power light starts blinking--COUNT THE BLINKS.
4. THREE BLINKS, pause, THREE BLINKS (ETC) IS SHORT PROTECTION AND A DO IT YOURSELF repair for some people. I have complete instructions for this repair.
5. 5 blinks, pause and 5 blinks etc is short on 140 volt line and while not as easy as 3 blink error code it points to places to look at.
If this told you something you did not know, rate this solution as very helpful as I do this here for free.
Post a comment here when you know what error code is and I will help.
Service manual says 3 flashing red leds = eeprom error (main digital / video pcb).
Suggest you start by implementation of Fujitsu Service Bulletin PDP 0068-01 Main Digital pcb see:-ttp://www.eserviceinfo.com/download.php?fileid=43450
the light bkinks 3 times then two times nothing works.
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