MAGNAVOX FUNAI 32MF301B/F7 blows fuse

[Tedybear]

Re: MAGNAVOX FUNAI 32MF301B/F7 blows fuse

Ehhh.... There is something to be said about a simple design. Although it would have been nice for the designers to use some safe guards to prevent blowing/shorting ALL the semi conductors out. (From the look of that repair kit--I'd say that was probably common)

S-

[triplefour]

Re: MAGNAVOX FUNAI 32MF301B/F7 blows fuse

wow :o

[tom66]

Re: MAGNAVOX FUNAI 32MF301B/F7 blows fuse

It is not a simple design - it is a CHEAP, crap design. There is a difference. Instead of a controller IC with clever logic in it which can detect a myriad of faults, they've got a ton of passive components, including multiple semiconductors which has no fault detection at all (save from the mains fuse.)

On a normal PSU the FET might blow... this may take out the controller but that's all. (A shorted diode on the secondary would never cause this with a good design.)

On this PSU if anything causes excessive load on the output it'll eat a bunch of FETs/transistors and in the worst case can damage the transformer and nearby passive components making it a right pain to fix.

[triplefour]

Re: MAGNAVOX FUNAI 32MF301B/F7 blows fuse

ahh so basically they skimped on any "expensive" IC's and just used a pile of cheap resistors instead? think ill be trying to avoid these! cause even if i repair it, its bound to fail again eventually...and be a pain in the ass to fix every time!

not that im going to quit on this one or anything....