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crwdns2944351:0crwdnd2944351:0Combi microwave oven Siemens HTHB86P IGBT Replacementcrwdnd2944351:0crwdne2944351:0

crwdns2933797:0Sandra Hillercrwdnd2933797:0crwdne2933797:0

crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Sandra Hiller

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Combi microwave oven Siemens HTHB86P
Type
replacement
Thing
Replacing an IGBT(Insulated Gate Bipolar Transistor)
Title
Combi microwave oven Siemens HTHB86P IGBT Replacement
Introduction
Advance warning: a microwave oven uses high voltage. Disassembling it, if you are not knowledgeable, can lead to life-threatening situations, even quite some time after the plug has been unplugged.
This microwave oven was presented to me for repair by my sister. After years of faithful service, the unit had completely failed. My brother-in-law discovered that the main fuse in the unit had blown and replaced it, but the new fuse had a particularly short life.
Several tips from colleagues have been incorporated into this report.
A microwave tube needs high voltage to function. Some microwaves generate this high voltage (about 8000V) by means of a large transformer. This microwave, however, does so in a different way, namely by means of a so-called "inverter," a circuit board equipped with a relatively small transformer, and several switching semiconductors. My brother-in-law discovered that the fuse no longer blew when he disconnected the inverter board.
Time Required Min
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Time Required Max
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Imageid
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Difficulty
Moderate
Conclusion
Now, reassemble your microwave, and you'll find it fixed! - Worked for me anyway.
Author
Roland
Public
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  • Multimeter x1 added.
  • Soldering Workstation x1 added.
  • Large Needle Nose Pliers x1 added.
  • Flathead 3/32" or 2.5 mm Screwdriver x1 added.
  • iFixit Thermal Paste x1 added.
  • Clear Nail Polish x1 added.

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