I have an optoma EP771 that powers up, shows image and then shuts off. It then blinks the error code for Ballast UART error. The power supply seems good. Not sure if this is a ballast or main board issue. What should I look for? Should I try to order the ballast. Nobody seems to know what this error actually means.
Same thing happened to me. After one minute of running, lamp shuts off and 5 power led blinks and 3 ready led blinks, indicate UART ballast error. Well, I purchased a new lamp, and installed it, and the problem was gone. I looked closely at my old lamp, and it showed a little blister inside, and a tiny spot of white residue, perhaps it was the whole problem there, although I don
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Those 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://homenol.blogspot.com/ http://electronicshelponline.blogspot.com/
If blinks continue without any pause, the main board is faulty.
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to diagnosed where the cause came from, first place to be done disconnect the connector that supply to the inverter board for screen back light which may have shorted line that can cause of suddenly shut off. then tried to turn on the tv with out the ballast board, if the supply from the power supply get stable and the indicator stay with out blinking that was mean the ballast board could be bad. by the way you must replaced first bulged capacitor at the power supply board. hope this can helped good luck.
By what you have told me, the lamp possibly may have blown, so check if the product is still under warranty as you may be able to claim another lamp at no cost what-so-ever!
It is however a definite code to tell you something is wrong!
Hope this helps ;)
cutta, you will most often hear a click on boot then the fans start up and lamp will then fire. The picture will start to show up....at what point does it shut off? and do you hear a click when the tv is turning off? Is it the complete tv shutting down, fans and everything that turns off? Do you see any lights on the the front panel "POWER", "STATUS" or "LAMP", what are they doing?
If you see a Power, Status or Lamp light after it shuts off the below are what they mean if there is an issue.
POWER - STATUS - LAMP - CONDITION/ISSUE:
Off - Yellow - Off - Temp. high/dirty filter/excess room temp
Off - Off - Yellow - 4000 hrs. Lamp usage warning
Off - Off - Blink Yellow - Lamp Cover open
Off - Blink Yellow - Off - Air Filter Cover open
Off - Off - Red - Lamp failure (failed to turn On or broken)
Off - Blink Red - Off - Fan Has Stopped
Off - Red - Off - Circuit failure (short) or DVI cable disconnected
If you want to check for the last "Error Code", after you first turn the TV on, by pressing the front panel ?DEVICE? and ?MENU? buttons at the same time and holding them for 5 seconds, it activates the Error Code Mode.
The ?Power LED Light? blinks/flashes (1/2 sec delay) and then flashes again denoting a two digit Error Code indicating no problem or an error has occured since the last Initalization. i.e. "Power light" blinks 3 times (1/2 second delay) and then blinks 4 times then 1 sec delay and repeats a few times. This would mean "Error 34 - Lamp abnormality". See below for error codes.....
Error Code - Description or issue
12 - No Error detected, check Power Supply
32 - Lamp Cover is open
33 - Air Filter Cover is open
34 - Lamp abnormality
36 - Light Engine (DMD or LAMP Fan stopped)
37 - Exhaust or Lamp Ballast Fan stopped
38 - Lamp temperature high
39 - DMD temperature high
41 - Short is detected
44 - DVI cable between FMT & Engine disconnected.
Sorry for the long answer but it was an open ended question.