Vizio image cleaner12/31/2023 ![]() Conclusions: I am assuming that the die temp must get way above the 52C measured at the heatsink, in order for the chip to go crazy, and so the heatsink and compound may not be doing a good job of sinking the heat, so replacing the compound may solve the problem, but probably not, In any case the new tests should be interesting. Then the face of the heatsink will be polished to a mirror finish by rubbing it on a sheet of glass with jeweler's rouge, thermal compound will be carefully reapplied, the heatsink and main board will be reinstalled and, and the temperature tests will be repeated, with and without the fan. I am still waiting for the ARCTIC COOLING MX-4 Thermal Compound, to arrive, at which time I will, uninstall the main board, remove the heatsink, clean the old compound off, and identify and take pictures of the the BGA Chip (if possible). ![]() The fan was installed, see pictures and the temp rose to 34C over 11 minutes, and was then left on for 8 hours with no problems. The paper clip piece fits well into one of the 12V slots on the PS input plug. A ring terminal was soldered the ground lead and a small piece of paper clip on the hot. 3) A junk box Hanano Ball ball bearing fan, 51mm X 51mm X 6mm was modified. Display remained normal, and TV was switched off and allowed to cool. 2) An ordinary household fan on low was directed at the back of the TV from a few feet away, and the temp increased over 11 minutes to a stable reading of 38C. 1) With no added cooling whatsoever, the temp increased over 43 minutes to 52C, at which point the the display started to flicker to the striped pattern, and the TV was shut down, and allowed to cool. Greetings EEVBees: -I took some temperature readings using a Fluke 87V and thermocouple of the heatsink on the mainboard of the Vizio M320SL, all with the back removed. ![]() "In the heat of battle, my father wove a tapestry of obscenity that as far as we know, is still hanging in space over Lake Michigan." Ralphie Parker Best Regards Clear Ether Also, could you (or anyone) please tell me if a reflow is likely to buy me any delay in the inevitable? -As always, thanks for the outstanding help. I realize you said leaded, but did you possibly mean unleaded? I have heard far more about tin whiskers from unleaded solder taking out BGAs (which I assume this is) than high heat melting the (lower melting temp) leaded solder balls. At present I could also buy a guaranteed used board on eBay, for $95, but by the time I decide I need one it is likely to be gone, but I will probably be able find smashed screen units cheaply for the foreseeable future. I will not be calling SJ until such time as I am ready to consider purchasing one. It seems unlikely that the kit would include the chip in question, nay? If anyone has any idea what is included in such a kit, please advise. ShopJimmy is selling a repair kit for all three boards for $88 plus shipping, see below link. I shall proceed with any and all low cost repair attempts and report back. Dear Tom: -Damn! I was rather afraid that might be the problem.
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