Mitsubishi VCR problem

C

Craig Combes

Guest
Hello,
I hate throwing anything as substantial as a VCR in the trash, so I'm
trying to repair my Mitsubishi Model HS-413UR.
When I hit the power button, it comes on for a couple of seconds and
then turns off.
I have the manual and I've probed around a bit to see if there's
anything obvious. Does anyone know how these power supplies,
particularly the main power supply chip, IC 901, a STK5472, work? It
seems like there's a feedback loop that's detecting a problem in the
unit and shutting down.
Any help would be greatly appreciated!
Thanks!

Craig
 
Hi,Craig

Did you check the Transistors(D1212) of power pcb, and there are 4OP chip
could be burnt.

"Craig Combes" <craigc15@pacbell.net> wrote in message
news:405E7055.1E8FFEC@pacbell.net...
Hello,
I hate throwing anything as substantial as a VCR in the trash, so I'm
trying to repair my Mitsubishi Model HS-413UR.
When I hit the power button, it comes on for a couple of seconds and
then turns off.
I have the manual and I've probed around a bit to see if there's
anything obvious. Does anyone know how these power supplies,
particularly the main power supply chip, IC 901, a STK5472, work? It
seems like there's a feedback loop that's detecting a problem in the
unit and shutting down.
Any help would be greatly appreciated!
Thanks!

Craig
Click to expand...
 
Thanks for the reply.
I did some more checking this morning and found that IC902 (a zener diode) is
shorted. It was killing the 30 volt supply. I must have overlooked that
yesterday.
Now I just have to find one.
Craig

Shell wrote:

Hi,Craig

Did you check the Transistors(D1212) of power pcb, and there are 4OP chip
could be burnt.

"Craig Combes" <craigc15@pacbell.net> wrote in message
news:405E7055.1E8FFEC@pacbell.net...
Hello,
I hate throwing anything as substantial as a VCR in the trash, so I'm
trying to repair my Mitsubishi Model HS-413UR.
When I hit the power button, it comes on for a couple of seconds and
then turns off.
I have the manual and I've probed around a bit to see if there's
anything obvious. Does anyone know how these power supplies,
particularly the main power supply chip, IC 901, a STK5472, work? It
seems like there's a feedback loop that's detecting a problem in the
unit and shutting down.
Any help would be greatly appreciated!
Thanks!

Craig
Click to expand...
 
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