- swapping out K type thermocouples? - 1 Update
- Novice please help electric heater - 1 Update
- VIZIO Model # M550SV 55" randomly shuts off - 2 Updates
| ABC_D <jason.b@noatm.com>: Nov 13 10:46AM -0500 I have a project that involves controlling temperature with a thermostat. The device used is here: https://www.ebay.com/c/595562870 However, since the temperature monitoring location is soon to be well beyond the length of the current thermocouple leads, I am considering swapping out for this: https://www.ebay.com/itm/Extra-Long-200-inch-K-Type-Thermocouple-Wire-for-Digital-Thermometer-Temperature/310752960059?hash=item485a51de3b:g:cqsAAOSw1HVfHfL~ The problem is that the connecting leads don't match. Can this longer thermocouple's ends be cut off and be replaced with the same type of U interface that the current one uses? Thank you. |
| John Robertson <spam@flippers.com>: Nov 12 06:22PM -0800 On 2020/11/12 5:56 p.m., user 18297 wrote: > Would you suggest I find one of those gizmos and replace it, or would it work just as good to solder a wire across there? > Any help would be appreciated. > Thank you Looks like a thermal fuse, the heater overheated the fuse (vent blocked?) and it opened up. Try to find one of the same heat and current rating. You might need the parts manual for your heater to get the correct part. Don't buy the part on Amazon, too many counterfeit parts! Pay a bit more and buy from an appliance (or other bricks & mortar) parts shop. John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
| Hilda Winkler <hildawinkler77@gmail.com>: Nov 12 01:52PM -0800 On Friday, November 6, 2020 at 9:10:58 PM UTC-5, Hilda Winkler wrote: > > We've tried several profiles but they're hit or miss. Ideally it should be reballed or the chip outright replaced. Because of the drop in price for a new TV, we've stopped servicing this model. > > I would go less on the temp, maybe 325C for 3 minutes tops. If it works, considering opening a hole in the back cover and adding a slow moving fan. > after taking the over off, and visually inspecting the boards. I found five bulging caps 220uf, 25v all the same. on the main board. ordered new ones, will post if successful.. I replace the bad caps, not successful, still got the vizio logo frozen on screen, then i tried to heat up the BGA chip, now the set is dead..??? no logo, no back lights. |
| "ohg...@gmail.com" <ohger1s@gmail.com>: Nov 12 03:34PM -0800 > > > I would go less on the temp, maybe 325C for 3 minutes tops. If it works, considering opening a hole in the back cover and adding a slow moving fan. > > after taking the over off, and visually inspecting the boards. I found five bulging caps 220uf, 25v all the same. on the main board. ordered new ones, will post if successful.. > I replace the bad caps, not successful, still got the vizio logo frozen on screen, then i tried to heat up the BGA chip, now the set is dead..??? no logo, no back lights. Reflowing is a bit of an art. You need to get the chip hot enough to reflow the crappy lead free solder that is brittle and flows at a higher temperature than tin/lead that they use these days, but that much heat is close to where the chip dies... temperature over time. You also need to be sure you don't warp the board under the chip while you're doing this. *BUT*(!), you said in your first post you were getting a random shutoff condition, and now you said it was getting stuck on the Vizio logo on the screen. That's a different issue altogether, although it's probably too late now because you might have torched the BGA. The M550SV not starting at all or getting stuck on the boot logo is generally a corrupted NAND chip on the back side of the board. It's a 48 pin surface mount TSOP1 flash (the only one on that board) and isn't easy to change if you don't have surface mount soldering experience. I used to change them when the TVs were pretty new until the BGAs started acting up as the TVs got older and built up miles. Check your connections. If you can get it back to the stuck logo, you can order one of these already programmed from a guy in Texas - I think it's Coppell TV or something close, and change it if you can solder tight pitch smd stuff. If not, keep trolling ebay for a cheap one. |
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