[TechAssist] Re: Sanyo DS31590 partial schematic needed
- From: John Mielke <maintv2002@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 19 Sep 2002 10:54:12 -0600
That exact set is in Sams 4355 or very similar sets are in Sams 4363 and
4339 and others. Do you mean the 7 and 9v sources are there but low?
What is the +130v source? This power supply runs all the time but at
about 60% (the 130v source is about 75v) when in standby. To force the
power supply on, short the anode of D680 to ground. To force the entire
set on short the cathode to ground. With a lightning damaged set we
have seen the audio output short to load down the power supply. BTW, if
you need to replace Q601 and Q604 you need to use the exact transistors
(generic OK) but not NTE or they run very hot and will short again.
They are 2SC4423 and 2SC3807. John.
John Mielke
Main TV
636 Main St.
Longmont, Co.
maintv2002@xxxxxxxxxxxxx
Dave Routson wrote:
> This Sanyo had power surge and every section lost
> power. I have replaced all regulators, HOT, opto-isolator and still have 9
> and 7V sources not all there.
> Thought maybe someone has a scan or partial of
> SMPS where I can trace out losses. I am just about
> to zero this one but thought I would ask first.
> Thanks for any help.
> Dave Routson
> Dave's TV
> 208 Stroud
> Cleburne, TX 76033-8738
> Ph. 817-641-8465 fax same
> email. davestv@xxxxxxxxxxx
>
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--
John Mielke
Main TV
Longmont,Co
303 776 6955
maintv2002@xxxxxxxxxxxxx
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