- Vizio no pic - 2 Updates
| Stu jaxon <stankowalski02@gmail.com>: Jul 27 09:52AM -0700 On Saturday, July 27, 2019 at 12:01:14 AM UTC-4, Jeff Urban wrote: > I don't know if it works on all of them today, but if you take your fingers and bounce them kinda hard and you see glimpses of light the backlight is working. You might be missing power to the Tcon or have a bad Tcon. Unfortunately I do not recommend putting any money into this new junk. > Best course of action now is to always save the box and get he longest FACTORY warranty they have after you buy a new one. > Only other thing is to look for bad caps. Either the bulge or not but I got other ways of testing them. I did bounce the ribbon cables around, no flicker, than again the main board fuse f701 is blown, no 12v on either side fb401. how do i find the fuse ratings for the main board, and you said you have other ways of testing the caps on the tcon..? |
| John-Del <ohger1s@gmail.com>: Jul 27 10:58AM -0700 > I changed the fuse f701 on the main board before you posted. I installed the original tcon board, and powered on the tv, and got no pic, no audio, and the backlights went on and then off, no blown fuse. so, i installed the new tcon board recently purchased from ebay, and the fuse f701 blew. I should have removed the ribbon cables, I tested some caps on the original and found that three metal cylindrical caps are shorted. I know it makes no sense. but anyways, I returned the new board back to ebay, and am going to purchase a new one. I want to make the tests you mentioned but am out of fuses, so how i can i find the ratings on them, it's a smd white fuse with a number 5 on it, any ideas..? The two fuses on the main are marked with a T. According to my notes, that makes them 5A 32V. Again, you're not differentiating what boards are what. Did you blow fuses on both mains? One more time: replace the fuses on one of the mains and install the complete set of boards. Do not turn the TV on. Read the resistance of the fuses on the main and FB416 near the LVDS connector on the main to ground. They should have no less than several thousand ohms on any of those points. If you get a low reading, disconnect the TCON. If the short goes away, your TCON is shorted. Install you second TCON and read again. If the short reappears, your second TCON is shorted. If you get a low ohm condition to ground on the fuses or the FB, you'll blow fuses every time you plug it in. Those caps are bypass filters to ground and will read short if the source they're on is feeding a shorted device. Those larger caps might also be bypassed by low value low ESR ceramic caps, any of which will present a short across any of the parts paralleled in the circuit. |
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