Here is a Magnavox ZV450MW8 DVD/VCR combo that will only stay powered up for 1 second. I found a short on the 9 volt power supply line keeping it from staying on.
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00:00 Intro
00:57 A look inside
02:24 Power on tests
03:19 System control schematic
04:15 I can make measurements here
04:46 5 Volt measurement
05:54 Some more measurements
07:03 Measuring R1057
08:01 The diagram is different that the unit
10:24 Some more voltage measurements
12:23 MK-168 Tests
13:41 New parts installed
14:55 Tape loading tests
16:28 Mode select switch servicing
20:24 Tests after mode select switch cleaning
22:35 VCR cleaning with ACETONE and COTTON SWABS!
24:01 Optical pickup cleaning
25:09 VCR playback tests
26:38 DVD record tests
29:43 Final thoughts/closing words
