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crwdns2933797:0Robert Repaircrwdnd2933797:0crwdne2933797:0
crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Robert Repair
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| [title] Preparation and analysis | |
| [* black] Remove the back cover (10 screws) | |
| - | [* black] BE AWARE: NEVER TOUCH THE HOT SECTION IF POWER CABLE PLUGGED IN!!!!! |
| - | [* black] Main chip is under black metal heat sink, I attached a temperature probe on the heat sink; with this device always shut off when reaching 50deg C in my case; value may vary depending on measurement devices; but effect was quite repeatable |
| + | [* black] BE AWARE: NEVER TOUCH THE HOT SECTION IF POWER CABLE IS PLUGGED IN!!!!! |
| + | [* black] Main chip is under black metal heat sink; I attached a temperature probe on the heat sink; device always shut off when reaching 50deg C in my measurements; value may vary depending on measurement devices; but effect was quite repeatable |
| + | [* black] Reason for overheating could be a) bad thermal conduction/circulation; b) damaged main chip; c) damaged peripheral electronic parts |
| + | [* black] without schematic and with my limited capabilites in in-deep- circuit study a fix for option c) did not seem feasible to me. Same for option b) as the chip is a large QFP - replacement was not a real option for me. So option a) remained. As TV worked remarkably longer just without rear cover, I assumed solution could not be too far away. |