Question about Toshiba Televison & Video
Screen quickly flashes and power led light blinks 10 times from the time I plug it in and powers off. During the process I hear just brief static noise and no picture.
Are you able to remove the back and get some voltage readings?
Posted on Apr 11, 2022
Testimonial: "I’ve got the back off and I checked the fuse and I know it’s fine. I have no clue where else to check."
You have one of three issues, bad main, power board or backlights, first thing to test is the main board, look on the power supply at the legend and look for one marked PS_on or INV_on, measure that pin using frame as ground and see if you have from 3.2 to 3.6 VDC with the set powered on but not working. I want to see what you find there before going on.
Larry I could not see a PS_on or INV_on
I replaced power supply and it still flickers the Toshiba screen and the led still blinks 10 times.
Anyone have a suggestion?
It don't make any sense replacing boards without doing the testing to find out what board is bad. Your power supply board has it marked pwon, it's pin 12, test that for just over 3 vdc, if you see it test the backlight on pin, should see around 3 vdc (pin 13), if either voltage isn't there replace the main, if both look ok your backlights are defective and I think this will be your issue.
Larry, I found those pins and no voltage at all. Guess I need a new main board.
Let me double check something, you have the red lead on the pwon pin, black to frame ground then push the on button on the TV and don't get any voltage, correct?
On my Power Supply the closest I could find is at the connector which goes to main board. On mine it is pin 12 (PWon) reads .33 VDC and pin 13 is listed as listed as BLon at .13 VDC. I did use the power button this time. It takes a bit for it to turn on after it turns off.
Larry sorry about the comment you posted con PWon. I thought I read PSon from your comment. I was a Army Instructor and I was good at teaching Omh’s law so I was always stuck teaching that. I’m retired Army April 8, 1989- 30 September 2011. Before the Army was a Marine from 9 May 1984-7 April 1989. I was a mechanic and retired as a motorSgt. Thank you for your assistance
Larry, I replaced the main board. Now when I push the power button the red led light stays on with no picture or sound. If I press the on/off button again I’ll get a full screen and it flashes off and when it does the speakers make a one second speaker static noise. The red led light now flashes 5 times. ????? I guess maybe the bulbs are bad?
×
300 views
Usually answered in minutes!
×