open filter cap perhaps? try scoping the B+ for ripple. Gary McCartney McCartney Electronics Guelph Ontario Canada Est. 1984 email: gary (at) number63.ca David Lessard wrote: > While digging a bit deeper I decided to monitor the raw 150V +B which is > derived via bridge rectifier consisting of CR101-CR104, this bridge's AC is > supplied via 2.7ohm/15w resistor R102. Anyway while monitoring the 150VDC I > noticed that evertime the TV tried to fire-up the raw +B would drop > dramatically, almost in half before it would "click" - "shutdown" and start > the cycle again. I suspected R102 breaking down under load and swapped it > with a known-good resistor, same problem!! Question is what would cause +B > to drop dramatically? What is causing such a load? Again, I'm stumped but > still digging. David Lessard, Alexandria, Ontario, mr_fixit@xxxxxxxxxxxx > > ----- Original Message ----- > From: "David Lessard" <mr_fixit@xxxxxxxxxxxx> > To: <techassist@xxxxxxxxxxxxx> > Sent: Friday, October 14, 2005 3:24 PM > Subject: [TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A - > Dead - Shorted HOT > > > >>Follow-up: >> >>Replaced HOT, and R426 horizontal drive +B, resistor value was up by >>800ohms. TV pulses ON/OFF when ON" button is pressed, TV comes on for a >>brief second as power cord is unplugged. I've replaced C672, C654 and > > C656. > >>When I disconnect RED wire on standup board next to VIPUR TV pulses > > ON/OFF. > >>What am I missing? What are the start conditions for this chassis to >>fire-up? I know nothing about this 25 year old chassis. Thanks in advance. >>David Lessard, Alexandria, Ontario. mr_fixit@xxxxxxxxxxxx >> >>----- Original Message ----- >>From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx> >>To: <techassist@xxxxxxxxxxxxx> >>Sent: Monday, October 03, 2005 9:57 PM >>Subject: [TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A - >>Dead - Shorted HOT >> >> >> >>>Yes. >>>Dead,5A fuse blown. Fix: Shorted cap C425 (043uf@200V) yoke return I >> >>think. >> >>>After you get it on, here's some issues you may face: >>>Brightness a bit exessive,retrace: C122 (30uf@250V) front of flyback. >>>Raster narrow at sides, slight bow: Q1 on pincushion upright board near >>>rear of chassis. RCA#146847/2N2222A,checks OK-replace it. >>>Channels 2-6OK, no 7-13. Open and resolder all stakes inside the MTT001 >>>module. >>>Bands of interference (two) slowely moving up thru picture.: Inside the >>>MTT001A, change C654(100uf/16v),C672(220uf/25V),C656(330uf/10V). >>>Immediate shut down at turn on:Flyback bad. >>>Vert. retrace at top inch of screen.All assoc. caps seem to ESR OK. >>>R506(6800ohm/2W) runs hot normally.Remove,scrape leads and resolder. >>>Left side jailbars: Workaround: Add a 10uf/250V cap across CRT's PC >>>board's stakes, pos. to "C6", neg to "Z1".(saves pulling chassis) >>>Excess brightness: C122 (47uf@250) >>>Unusual brightness issue: Increase brightness with control,all sudden at >>>max: R721 (680ohm) increased to 690ohm. Also: Q703 shorts >>>(#143806/NTE159).HTH. >>>Phil >>> >>>Philip Bader >>>Jan Phyl TV Inc. (estab. 1976) >>>3420 Recker Hwy. Winter Haven, Fl. 33880 >>>Fax (863) 299-8821 >>>email: tjanphyl@xxxxxxxxxxxxxxx >>>personal/ alt. email: pbader@xxxxxxxxxxxxxxx >>>see our ad at: >>> >> > http://jan-phyl-television-pc-monitor-service.9601288257006.worldpages-ads.c > >>om/ >> >>> >>> >>>David Lessard wrote: >>> >>> >>>>This TV has a shorted HOT (C1308K), main fuse is blown. Are there any >> >>common problems besides a bad flyback which could cause this? >> >>>>Thanks in advance, >>>>David Lessard >>>>Alexandria, Ontario, Canada >>>>mr_fixit@xxxxxxxxxxxx >>> >>--------------------------------------------------------------------------- >>-- >> >>>>This Email List is accessible to the general public through search >> >>engines. 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