Question about Televison & Video
Channel Master Digital Analog Converter Box Model No. CM-7000, Has A Module D2A_R12, Manufactored By DeltaCom Electronics LTD. 03.DEC.2007, Has A Part With m1100 16V, ; I Checked Other Parts Identical, And They In Both Directions Give A Reading, But E1 In Both Directions Goes Infinite. What Is This Part And Where Can I Buy This Part. Now Remember All The Others E2, E3, E4 etc. Gives A Reading. Also Have Checked All Fuses(All Good) F1 - F5, FF1 - FF2, FT1 - FT2, FW1 - FW2 etc. Unit Has Red Power Light But Does Not Turn On When I Push Power Button Or With Any Remote Control.
E1 is a 100 uF 16 VDC capacitor. I have been repairing these units lately and have experienced some of the same symptoms (LED goes red but doesn't transition to green after 30 seconds like it should). I have been able to repair some of these units. Make sure the power supply is working properly before spending significant time on the D2A board. The power supply is responsible for supplying 12, 5, and 3.3 VDC to the D2A board. A defective PS will measure 14.5 instead of 12, 6 instead of 5, and 2.9 instead of 3.3. The AC ripple should be about 5 mV on the 3.3 and the 5 volt supplies when loaded. The 12 volt can be as high as 50 mV on a good PS. The culprits are C12 (1000uf) and C10 (470 uf) which are the filter capacitors for the 3.3 and 5V outputs respectively. C12, the capacitor for the 3.3 V output is especially critical because it is used to feed the voltage regulator and overvoltage shutdown circuit. D7 is a hot part and can also fail sometimes. I have repaired 50% of my units just by changing these capacitors. I still have units where the D2A board is bad with a known good power supply. If anyone has more info on the D2A (like a schematic) please pass it along
Posted on Sep 06, 2012
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Posted on Jan 02, 2017
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