[TechAssist] Re: Sanyo DS31590 partial schem update
- From: "Tech Repair CD support" <support@xxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 19 Sep 2002 19:05:33 -0400
Dave,
On my website, www.intrepid-video.com/database.htm there is a contact for these
Sanyo units.
Give this fellow a call, have all your findings ready and I bet he leads you to
the problem in minutes.
Jeff
FAX 717-564-4952
Intrepid Video & Electronics
501 Luther Rd
Harrisburg PA 17111-2055
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They may become your words any moment.
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----- Original Message -----
From: "Dave Routson" <davestv@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, September 19, 2002 5:54 PM
Subject: [TechAssist] Sanyo DS31590 partial schem update
John, I don't have any of those particular schematics
but sure wish I did right now. I need to know what
D1901 is. It was leaking and loading the 5V line and
caused the failure of IC681 and the replacement also.
It shows 7.5C on it which I believe is probably a 7.5V
zener but can't cross 7.5C.
Also power set as you mentioned and HV came up
and regulated B+ to 130V so that section ok. I have
to get the 5V circuit right before anything else will be
evident.
Thanks for all the replies, John, Jeff and Gary. You
may save me from pulling the plug on this one yet.
Dave Routson
Dave's TV
208 Stroud
Cleburne, TX 76033-8738
Ph. 817-641-8465 fax same
email. davestv@xxxxxxxxxxx
Dave,
>From Tech Repair CD:
**SANYO*DS31590*DEAD AFTER STORM****Q601 SHORTED(2SC4423) FUSE Q604
LEAKY(2SC3807)*******
**Sanyo*DS31590*Dead After Surge****Replaced Fuse And Rectifiers And HV
Fires But
Brain Dead*Replaced 5v Regulator- Ic681 (ECG 977) And Got Tuning Sound, Etc.
But
Now Won't turn off.*Replaced Q681 (Ecg85)*****
Also check Q695(2SC1815).
**Sanyo *DS31590*DEAD-lightning****Repaired primary sideQ601Q604Q605 all
shorted-also had caps C609 blown apart and C626 bulged like a
balloon*Replaced
IC601even though it checked ok.*Found Q695 leaking. Q695 is 2SA608F.
Replaced
it with a TCG290A*****
Good luck.
Jeff
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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