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When the Plasma TV is plugged in, there're a fewindications of normal operation. Knowing this will help usunderstand what's going on with the unit when anabnormality occurs.1.There is a click from the relaysRL402andRL403when they are activated.2.The LED in the Optical Jack inside the DT board turns on for approx. 4seconds.3.Immediately after that, one of the Tuner LEDs (Right) turns on(Solid Red)for approximately 20 seconds.4.The LED in the Optical Jack inside the DT board turns on again for approx.1 second and both LEDs (tuner and optical jack) turn off.5.Then you will hear another click from the relaysRL402andRL403indicating that they are no-longer engaged. (Note: At this time the Tunerand the Optical Jack LED turn off.)5
Are there any blown caps on the PSB-power supply board. Most sets have sammy boards and they used very shotty caps. If there are no visual clues being a poped cap at the top (X) they simply often do vaporize and dry out. The YSUS-Main and the 2 Y buffer boards control the picture OSD-on screen display. Your not getting any of that. So power supply is where you start first. The YBU-upper and the YBL-lower control the upper and lower OSD the Ysus main control both of them. Usually if you have one in the door you have to replace all 3. But not always. If you were to replace any of the boards I would replace the YSUS-Main, or get the board reworked at a pc repair shop that does board level test and repai. Its more cost effective.
That blink don't mean nothing. Measurements need to be made. Don't just buy the board troble shooting would need to be done to see witch board is bad. Also look on the fron of the set and see how many time the led flashes. That wher your error code comes from..
to test all y sub boards remove the main power connection to the y main and turn the tv on if it powers on one of those boards are bad.. remove both sub boards. and plug in the y main. if it powers on then that board is good either, put your multimeter on 2k omh and test the upper ysub boards black connector, the top 2 pins with negative to the 5th pin positive. you should read 500-1k ohm if its way under 100 there is a short.
the bottom ysub board place the multimeters black probe on the bottom 2 pins of the black power conection and the red on the 4th pin.. results are the same.