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Question about Sharp VC-H993U VHS VCR

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Flashing (intermittent) display [--:--] no full power up

The display flashes 2-3 times then blank for aprox 1 count then repeats. The display shows - - : - - only. I have tried to reset by unplugging and plugging back in which worked a couple of times but haven't been able to get a response since. As the VCR doesn't fully power-up the power button doesn't work and it will not load a tape. I am something of an electronics hobbiest so I am capable of going inside to check/fix/modify the unit to make in function again. It is/was a nice VCR went worked. Please Help! Chris

Posted by Chris Schedgick on

  • Chris Schedgick Sep 26, 2006

    Thanks for the responses. The power supply was suspected by me as well. Any ideas as to what voltages to test for, and where, would be helpful so I can narrow down the offending component(s) if it is a descrete component I likely have it in my parts drawers. But if it is a specially wound transformer/coil then it could be troublesome.


  • Chris Schedgick Sep 26, 2006

    opened the case and looked closely at the power supply section. Guese what I found - discoloration on and around D905 which ties to Q901, a power transistor. The trace connecting Q901 and D905 was loose and intermitent. I resoldered the trace which resolved the intermitent condition (checked with multimeter). I then powered up the unit and still have same problem. Q901 does generate heat but resistance testing (power off of course) on D905 doesn't indicate reverse voltage blocking. While testing D905 a slight amount of resistance is indicated for an instant and then goes to infinity. There is a small ceramic capacitor C908 running in parallel with D905 which I believe is causing that to happen. Would you or anyone know the specs for D905? The barrel is about 1/16" length (half the length of a 'typical' diode) and is of typical diameter. would any diode of similar size work? Thanks again for pointing me in the right direction. It is most helpful:)




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I don't know how old this machine is but from what you are discribeing is a powersupply problem and it won't startup. if it's an older machine 6-10 years old it may be due to filters in the powersupply goeing bad.from what you say as far as being a hobbyest,Id shotgun all the filters on the power module .or the power supply section. buy that id change all of them mabe 6-8 are involved Good luck Walter Grzybowski

Posted on Sep 25, 2006



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You have a power supply problem and it most likly will not be worth you purchacing a schematic for this unit unless you want to spend 25 bucks + to fix it.

Posted on Sep 25, 2006


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