- Vizio no pic - 3 Updates
| str00ntz@aol.com: Jul 26 01:19PM -0700 > > > Old Tcon board... .4 ohms both sides,.. lvds unplugged .3 ohms... TV on .2mv on FB TV lvds unplgged pins closest to FB 2v- .3 mv.. hope i covered everything... > > Standby till Monday. I have a donor set of boards for that model but it's for the version with a separate TCON and FRC, so I don't have the combo TCON that you do. Still, the voltages from the main should be the same on the LVDS harness. I'll put the boards together and get some voltage readings. > I found both fuses on the main boards are open f701,.. circled in yellow, the fuses are next to cn701 harness from the power supply. https://imgur.com/a/yf8cz7v Stan, you have two original boards and two replacement boards. It's important to identify if any particular voltage or resistance is on the original, the replacement, or both! I have a main for a similar model that I was able to power up. With the TV ON, at fuse F701 there should be 12V on both sides of the fuse if the fuse is good.. F702 should have 24V, same conditions. Near the LVDS output harness on the main is a ferrite bead smd FB416. There should be 12V on that. With the TV powered down, the main disconnected from the TV, and enough time gone by to make sure voltage is bled off the main, there should be a resistance of no less than several thousand ohms. If those resistances are OK, plug the main back into the TCON. If the resistance drops anywhere to the tens of ohms or lower, the TCON is bad. Make sure you runs these tests on all boards in every combination. |
| Stu jaxon <stankowalski02@gmail.com>: Jul 26 07:56PM -0700 > With the TV powered down, the main disconnected from the TV, and enough time gone by to make sure voltage is bled off the main, there should be a resistance of no less than several thousand ohms. > If those resistances are OK, plug the main back into the TCON. If the resistance drops anywhere to the tens of ohms or lower, the TCON is bad. > Make sure you runs these tests on all boards in every combination. 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..? |
| Jeff Urban <jurb6006@gmail.com>: Jul 26 09:01PM -0700 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. |
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