Today my IBM E74 started smelling like it has an internal short. I suspect a capacitor. It works normally. After diconnecting power I tried to pen the case but could only release the 2 bottom latches of the back shell. The back shell does not want to release on the top. I did see 2 slots and inserted a small screwdriver but no success!
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There is a short within the HT section and this can be possible with the failure of the flyback transformer or the driver transisitor. So if you are equipped please open the back panel and check for shorting on the driver, also when powered this can heat up which confirms that the flyback is shorted. replace with the same type.
It sounds as if you have a component that has changed value enough in value to cause a high current draw, but has not completely shorted out. this phrase from you "so I did a stupid thing and bypassed the internal fuse and it turned on and worked" Not as stupid as you would think because it confirms what I said above, the 6.3 amp fuse tells me that the current draw normally is about 3 amperes since the normal rule of thumb is to double the value of the current to select the type of fuse. a five amp fuse should as well as a 4 amp fuse (it's best and recommended to use the exact fuse type). Now back to your issue. I would suspect that a transformer in the power chain has developed a shorted winding, or a capacitor begun to develop a short or excessive absorption.
I would suggest that you have the set looked at by a qualified TV technician.
i have the same problem. actually its a common problem for many T21 and other old IBM laptops.
i searched that you have to take all power (batery, adaptor)
press the power 10 times and press it for 30 secs then reinsert the battery or adaptor and try to power it on.
they say its done to discharge a certain capacitor that got overcharged after overcharging the battery.
that worked for me before but now my T21 wont start any more with this process.
In my 20 years of working on microwaves, I have never seen a capacitor fail in any way but a dead short, but it's possible that it's failure may occur in a less abrupt manner.
The internal structure of a capacitor is essentially a rolled up sandwich consisting of two thin layers of foil separated by a very thin insulator.
While a "perfect" capacitor consumes no power, in the real world, things can happen to change that.
A defect could increase the capacitve reactance or other internal resistance and allow internal heat buildup or expansion, which could lead to an intermittent short when it's warmed up a bit.
After a while, the short could become permanent - sort of like arc welding, if you're familiar with that.
So, while it's quite possible that this is the pathology that lead to a fully shorted capacitor, I think that's what you have, no matter how it happened.
Generally speaking, if the high voltage capacitor is shorted, the fuse will blow as soon as you hit the START pad. When the HV cap fails, I've never seen one do anything but short.
If it's a few seconds or so into cooking, it's usually the high-voltage transformer. There may or may not be a burning smell. The cooling fan often will dissipate the smell.
What can happen to the transformer is an expansion of the windings to the point where a couple of hot spots eventually make bare spots which touch, then the short causes the fuse to blow. When it cools, they aren't shorting anymore.
It's possible it's the mag or something else, but not too likely.
You can (carefully!) disconnect the primary leads from the HV transformer then run the oven, making sure the wires are free and clear. If the fuse blows, the problem is in the low-voltage side. If it doesn't the trouble is in the HV side.
If you broke a seal (tamper tag) or left any other evidence that you were inside the microwave, your warranty will be voided.
Some parts may be covered, but the labor warranty usually expires sooner. Be careful.