- Vizio no pic - 5 Updates
| Stu jaxon <stankowalski02@gmail.com>: Jul 28 01:37PM -0700 On Saturday, July 27, 2019 at 1:58:24 PM UTC-4, John-Del wrote: > 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. I'm outta fuses, any idea where i can find them..?, the Length is about.1/4 in, or 6.25mm. i searched and searched all I can find is the small ones. |
| Stu jaxon <stankowalski02@gmail.com>: Jul 28 01:56PM -0700 On Saturday, July 27, 2019 at 1:58:24 PM UTC-4, John-Del wrote: > 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. oops, the length on the fuse is 2/8 or 6.25mm. |
| Stu jaxon <stankowalski02@gmail.com>: Jul 28 03:30PM -0700 On Saturday, July 27, 2019 at 1:58:24 PM UTC-4, John-Del wrote: > 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. I tested FB416 near the lvds cable both sides to ground on the main board, a short on both sides, .6 ohms. removed the lvds cable from the Tcon board short went away. is there anyway to test the panel for a short.? |
| John-Del <ohger1s@gmail.com>: Jul 28 03:55PM -0700 On Sunday, July 28, 2019 at 6:30:03 PM UTC-4, Stu jaxon wrote: > > 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. > I tested FB416 near the lvds cable both sides to ground on the main board, a short on both sides, .6 ohms. removed the lvds cable from the Tcon board short went away. is there anyway to test the panel for a short.? It's unlikely the panel is causing the problem. The only TV I know of that would blow the TCON because of a shorted display is the Vizio E701i-A3. You need to acquire another TCON, and *before* you power the TV up, measure the resistances of the fuses and ferrite bead to ground with all the boards connected. If you pick up the short, you bought another bad TCON. If there are no shorts at this point, power up the TV with the two ribbons disconnected from the display. If the backlights stay on and the TV runs for 10 minutes or so, unplug the TV and reconnect the ribbons to the display and try again. If the TCON shorts with the ribbons reconnected, then you have a bad display taking out the TCON. I would suspect Windex Syndrome (cleaning solution sprayed on the screen in such a volume that it drips below the front mask and attacks the bonded address boards). |
| Stu jaxon <stankowalski02@gmail.com>: Jul 28 04:21PM -0700 On Sunday, July 28, 2019 at 6:55:54 PM UTC-4, John-Del wrote: > It's unlikely the panel is causing the problem. The only TV I know of that would blow the TCON because of a shorted display is the Vizio E701i-A3. > You need to acquire another TCON, and *before* you power the TV up, measure the resistances of the fuses and ferrite bead to ground with all the boards connected. If you pick up the short, you bought another bad TCON. > If there are no shorts at this point, power up the TV with the two ribbons disconnected from the display. If the backlights stay on and the TV runs for 10 minutes or so, unplug the TV and reconnect the ribbons to the display and try again. If the TCON shorts with the ribbons reconnected, then you have a bad display taking out the TCON. I would suspect Windex Syndrome (cleaning solution sprayed on the screen in such a volume that it drips below the front mask and attacks the bonded address boards). OK, Thanks for all your help. now I have to order a new tcon board and fuses. and there are no tcon boards available for this tv that i found. |
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