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MAGNAVOX 32MF301B - Power supply issues    
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tcole90



Joined: 07 Oct 2017
Posts: 5
Location: South Dakora

PostPosted: Sat Oct 07, 2017 10:02 am    Post subject: MAGNAVOX 32MF301B - Power supply issues Reply with quote

I have a MAGNAVOX 32MF301B/F7with power supply BA17F1F0102 that is totally dead, to start out with it blew the main fuse, I replaced Q600 Q601 D640 D610 D607 (all were shorted)and R608 the fuse no longer blows I have around 165 volts on drain of Q600, .2 volts on the gate of Q600, I am supposed to have 3.7 volts. I have checked every part on hot side of the board and nothing is bad, also have checked all other diodes and transistors and nothing is bad...any ideas anyone...I do not have the 24 volt p on voltage or any other voltages on the board, only one that is correct is the 165 on the drain. The schematic can be found here https://www.manualslib.com/manual/756899/Emerson-Lc320em2f.html?page=38#manual
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JTS1957



Joined: 21 Jan 2009
Posts: 2347
Location: Far, Far Away

PostPosted: Sat Oct 07, 2017 12:43 pm    Post subject: Reply with quote

Assuming you checked ALL parts on hot side, you should already have checked/changed THESE.

R600 / R603 / R604 and/or opto (IC601) may be defective.
tcole90



Joined: 07 Oct 2017
Posts: 5
Location: South Dakora

PostPosted: Sat Oct 07, 2017 2:30 pm    Post subject: Reply with quote

Thanks for the help!...Ive checked the 3 resistors you mentioned they all check good and changed IC601, I'm going to try replacing Q601 again, I have checked every part in the hot section of the board and can't find anything bad...I've worked on a number of boards like this and all the other times it was several shorted parts, replaced them and the set fired up..this one has me puzzled as this really is about as simple of a power board as they make.
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