Thanks for the information Jeff. Eventually I will find a schematic and this TV will be out the door. If you have any more tips, don't be shy, share your thoughts, anyone else!. David. -----Original Message----- From: techassist-bounce@xxxxxxxxxxxxx [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Jeff Dougherty Sent: Sunday, January 12, 2003 10:53 PM To: techassist@xxxxxxxxxxxxx Subject: [TechAssist] Re: Zenith PV4661 Projection TV David, I understand that, hence why I said I don't think your problem is in the vertical. I provided that information for future reference when working on projection sets. support@xxxxxxxxxxxxxxxxxx FAX 717-564-4952 Jeff Dougherty Intrepid Video & Electronics Be careful of your thoughts. 501 Luther Rd They may become your words Harrisburg, PA 17111 any moment. 717-909-8844 VCR tips, electronics info & general interest. www.intrepid-video.com www.tech-repair.net www.thetoolcaddy.com www.9-11-2001tragedy.com *********************************************************************** ----- Original Message ----- From: "David Lessard" <mrfixit@xxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Monday, January 13, 2003 8:26 AM Subject: [TechAssist] Re: Zenith PV4661 Projection TV Jeff, The flyback fires up but only for a second (therefore it's not possible to turn up G2). The (3) tubes flicker during the attempted startup, then shut down occurs. Turning the TV off then on produces the same result. The two resistors you mention near the flyback are related to video problems (this is what I was told), not a shutdown problem. Something is preventing the TV from firing up properly but what? What I need is more information, ie. schematics. Here are the module numbers for this TV. I would like to start debugging the vertical deflection circuit first, this seems the most likely cause for a shutdown problem because the vertical +B is flyback derived. Thanks. David. convergence PS - 9-553-01 video output - 9-625-01 SMPS - 9-628 sweep - 9-629 A/V selector - 9-660 low level registration - 9-666 registration - 9-667 video interface - 9-678 main module - 9-700 IF audio - 9-701 RF selector - 9-702 audio PS - 9-764 audio AMP - 9-765-01 high voltage - 9-815 -----Original Message----- From: techassist-bounce@xxxxxxxxxxxxx [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Jeff Dougherty Sent: Saturday, January 11, 2003 9:18 PM To: techassist@xxxxxxxxxxxxx Subject: [TechAssist] Re: Zenith PV4661 Projection TV David, I don't think it is the vertical circuit, now. With projection sets, if you have a vertical problem, the symptoms are usually the same as a direct view, except you see no horizontal line. Projections sets are designed to blank the video so as to not burn the line on the screen. To determine if the problem is in the vertical section, you need to increase the G-2 just slightly. If you see the horizontal line appear, quickly turn the G2 back down. You will get more assistance if you also include the module number in your posts. On Zenith..the small signal and convergence module numbers usually need to be posted. You have two resistors near the HOT, I believe...check those. One is 82, the other 110k, I believe. Also, since you have OSD..your vertical would not be the problem. support@xxxxxxxxxxxxxxxxxx FAX 717-564-4952 Jeff Dougherty Intrepid Video & Electronics Be careful of your thoughts. 501 Luther Rd They may become your words Harrisburg, PA 17111 any moment. 717-909-8844 VCR tips, electronics info & general interest. www.intrepid-video.com www.tech-repair.net www.thetoolcaddy.com www.9-11-2001tragedy.com *********************************************************************** ----- Original Message ----- From: "David Lessard" <mrfixit@xxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Sunday, January 12, 2003 4:15 AM Subject: [TechAssist] Re: Zenith PV4661 Projection TV FOLLOWUP: I just got back from checking out this TV in person. Symptom details: TV plugged in, SMPS fires up, press "ON" button, Front PWR LED is lit, HV starts but only for a second (crackling heard), just long enough to see tubes flicker, you can hear audio amp power-up (speaker click is heard), Front PWR LED remains lit. Before all these problems started the customer said the TV would come on but with no video, only OSG and audio worked (eventually the video worked but shutdown occurs within 30 minutes). What can cause a shutdown? The audio amp board has a seperate PS, it's not flyback supplied. What about the vertical circuit as Jeff suggested? I need a service manual (schematics) please, anyone? Thanks gentlemen. David Lessard Alexandria Electronics 50 Harrison Street Alexandria, Ontario K0C-1A0 (613)525-4502 mrfixit@xxxxxxxxxxx -----Original Message----- From: techassist-bounce@xxxxxxxxxxxxx [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Jeff Dougherty Sent: Friday, January 03, 2003 4:38 PM To: techassist@xxxxxxxxxxxxx Subject: [TechAssist] Re: Zenith PV4661 Projection TV David, Troubleshoot your vertical circuit. I have a feeling there may not have been OSD before..maybe customer was mistaken. support@xxxxxxxxxxxxxxxxxx FAX 717-564-4952 Jeff Dougherty Intrepid Video & Electronics Be careful of your thoughts. 501 Luther Rd They may become your words Harrisburg, PA 17111 any moment. 717-909-8844 VCR tips, electronics info & general interest. www.intrepid-video.com www.tech-repair.net www.thetoolcaddy.com www.9-11-2001tragedy.com *********************************************************************** ----- Original Message ----- From: "David Lessard" <mrfixit@xxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Friday, January 03, 2003 12:40 PM Subject: [TechAssist] Re: Zenith PV4661 Projection TV Hi Larry, Module I need is 9-815 however this is no longer available from Tristate. Flyback hasn't been made since 1997. Also, new problem, client turned on TV last night to double check the symptoms and now this is whats going on. Sound comes on right away, there is a horizontal red/green line visible for a split second, no menu visisble now, there was before, the sound is OK and obviously the flyback is working. Being half alive I'm sure I could fix this beast however I have resources on it what so ever, if ANYONE has schematics please let me know, I would like to study the circuit before heading over the customer. Thanks. -----Original Message----- From: techassist-bounce@xxxxxxxxxxxxx [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Larry E. Sent: Friday, January 03, 2003 9:26 AM To: techassist@xxxxxxxxxxxxx Subject: [TechAssist] Re: Zenith PV4661 Projection TV David, Don`t have the print so I don`t know the module # you can call Tri-State and they`ll look it up for you and give you a price, yes there is a dud charge but Tri-State will also sell it to you outright, there # is 800-203-7484. Larry Eastman American TV & Electronics Crystal River, Fl. David Lessard wrote: > You don't happen to know what module I need? Is it the whole chassis? I > know nothing about this projection TV and because of this I believe it > may be more practical to purchase and swap (is there credit for a dud?). > Thanks again. > > David Lessard > mrfixit@xxxxxxxxxxx > > -----Original Message----- > From: techassist-bounce@xxxxxxxxxxxxx > [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Larry E. > Sent: Thursday, January 02, 2003 8:53 PM > To: techassist@xxxxxxxxxxxxx > Subject: [TechAssist] Re: Zenith PV4661 Projection TV > > Dave, regular 1/2 watt resistors mounted on the top, just a real pain to > see it where it`s located,mine was a PV4665, but I`m pretty sure they > are the same, from the back of the set look at the right corner of the > HOT heatsink and you should be able to see R3244 the 82K, the R3243 is > usually on the other side of the heatsink next to R3244, Remember that > you can always swap the module if it gets too involved, available at > Tri-State module. I usually spend 1 hour troubleshooting a Zenith > Bigscreen to component level, after that I just swap the module, good > luck Dave, Larry E > >> David Lessard wrote: >> >>Larry, Thanks for the tips, another couple of questions, are these >>resistors surface mount of through hole? Just wondering what to bring >>to the customers house. Is this TV hard to get into? I would like to >>appear at least semi-intelligent when I open it up, :-) >> >>David Lessard >>mrfixit@xxxxxxxxxxx >> >>-----Original Message----- >>From: techassist-bounce@xxxxxxxxxxxxx >>[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Larry E. >>Sent: Thursday, January 02, 2003 8:24 PM >>To: techassist@xxxxxxxxxxxxx >>Subject: [TechAssist] Re: Zenith PV4661 Projection TV >> >>Dave, did you check/replace R3243 110K 1/2 watt? have to pull one leg to >>check it, goes way up in value and sometimes opens. Note that it`s >>VERY difficult to find, it`s located by the HOT heatsink usually on the >>right side,behind the heatsink, once you find R3244 (82K) your close >>they are in series with each other, have seen several of them cause your >>problem, also causes convergence problems, ie, no video with 3 bowed >>bars, 1 red, 1 blue, 1 green, Hope this takes care of it for you, >>Larry Eastman >>American TV & Electronics >>Crystal River, Fl. 34428 >>www.tvjunkyard.com >> >>>David Lessard wrote: >>> >>>Ed, Yeah I thought about the filament voltage at first but it doesnt >>>make sense that the menu is still present after the picture goes out. >>>So its only the video that dissappears, what caps are most likely to >>>cause this problem? >>> >>>Are they surface mount? I have no information on this chassis, can you >>>help out? Diagrams, schematics, tips, anything...Thanks a bunch Ed. >>> >>>David Lessard >>>Alexandria Electronics >>>mrfixit@xxxxxxxxxxx >>> >>>-----Original Message----- >>>From: techassist-bounce@xxxxxxxxxxxxx >>>[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Tel-Tek Electronics >>>Sent: Thursday, January 02, 2003 4:54 PM >>>To: techassist@xxxxxxxxxxxxx >>>Subject: [TechAssist] Re: Zenith PV4661 Projection TV >>> >>>David; >>>This is the C8S chassis. Without seeing it, hard to say, but sounds like >>>probably a bad connection on the board for the Filament voltage. Unless >>>it's only the Video that dissapears, then you got some bad Caps to >>>contend with in the Video circuit. >>> >>>-Ed- >>>>----- Original Message ----- >>>>From: "David Lessard" <mrfixit@xxxxxxxxxxx> >>>>To: <techassist@xxxxxxxxxxxxx> >>>>Sent: Thursday, January 02, 2003 4:08 PM >>>>Subject: [TechAssist] Zenith PV4661 Projection TV >>>> >>>>Hi techs, >>>> >>>>Has anyone ever heard of this model before? Google search turns up >>>>nothing. Customer describes the problem being a slow picture start >>>>(2-5 minutes - gradually) however OSG menu is visible before picture >>>>starts to come in, then after 30 minutes picture goes black again, >>>>shut down and cool off period required before trying again. Not sure >>>>if OSG menu is still visable at this point, forgot to ask, I will >>>>follow up on this. Any help would be appreciate. >>>> >>>>Thanks. >>>> >>>>"Share what you know, Learn what you don't" >>>> >>>>David Lessard >>>>Alexandria Electronics >>>>50 Harrison Street >>>>Alexandria, Ontario >>>>K0C-1A0 >>>>mrfixit@xxxxxxxxxxx >>>> >>>>------------------------------------------ >>>>Submit A Repair Tip For Everyone Here: >>>>http://www.tech-assist.org/secure/tip/main.html >>>>------------------------------------------ >>>>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 ------------------------------------------ Submit A Repair Tip For Everyone Here: http://www.tech-assist.org/secure/tip/main.html ------------------------------------------ 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 ------------------------------------------ Submit A Repair Tip For Everyone Here: http://www.tech-assist.org/secure/tip/main.html ------------------------------------------ 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 ------------------------------------------ Submit A Repair Tip For Everyone Here: http://www.tech-assist.org/secure/tip/main.html ------------------------------------------ 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 ------------------------------------------ Submit A Repair Tip For Everyone Here: http://www.tech-assist.org/secure/tip/main.html ------------------------------------------ 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 ------------------------------------------ Submit A Repair Tip For Everyone Here: http://www.tech-assist.org/secure/tip/main.html ------------------------------------------ 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