Hi John, The 9V source is there but I am having trouble tracing where the 7V source originates. B+ is 112V but set will not power up since voltages to sweep Ic apparently not right yet. I didn't have to replace Q601 or Q604 but did have to replace the drivers and opto. Before replacing the drivers and opto-isolator with a light bulb load across HOT and HOT loose, B+ was 289V. There is a test point TJ7 that shows on the pcb 7.6V and is located close to the tuner and in the vicinity of the sweep IC but it has zero voltage and does not read short to ground. Tracing back it ends up on Q627 Collector. It may be that this voltage is not developed until set is turned on so I will check into your instructions with D680. Also my 5V is a bit low, only 4.23V so must still have loads. Thanks for help. Dave Routson Dave's TV 208 Stroud Cleburne, TX 76033-8738 Ph. 817-641-8465 fax same email. davestv@xxxxxxxxxxx ----- Original Message ----- From: "John Mielke" <maintv2002@xxxxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Thursday, September 19, 2002 11:54 AM Subject: [TechAssist] Re: Sanyo DS31590 partial schematic needed 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 > > ------------------------------------------ > To REMOVE your email address, click here: > http://www.tech-assist.org/unsubb.html > To CHANGE your email address, click here: > http://www.techassist.net/forms/change.html > ------------------------------------------ > ***NEW*** Tips Added Instantly!!!*** > Submit Repair Tips here: > http://www.tech-assist.org/secure/tip/ > > -- John Mielke Main TV Longmont,Co 303 776 6955 maintv2002@xxxxxxxxxxxxx ------------------------------------------ To REMOVE your email address, click here: http://www.tech-assist.org/unsubb.html To CHANGE your email address, click here: http://www.techassist.net/forms/change.html ------------------------------------------ ***NEW*** Tips Added Instantly!!!*** Submit Repair Tips here: http://www.tech-assist.org/secure/tip/ ------------------------------------------ To REMOVE your email address, click here: http://www.tech-assist.org/unsubb.html To CHANGE your email address, click here: http://www.techassist.net/forms/change.html ------------------------------------------ ***NEW*** Tips Added Instantly!!!*** Submit Repair Tips here: http://www.tech-assist.org/secure/tip/