Check the B+ filter cap. Jerry Silverman Greentron Inc Mail to: greentron@xxxxxxx 4 Newland Ave Greenville SC 29609 864 232 3889 ----- Original Message ----- From: "David Lessard" <mr_fixit@xxxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Friday, October 14, 2005 8:29 PM Subject: [TechAssist] Re: [TechAssit] RCA - 27" TV - PMR623ER - CTC130A - Dead - Shorted HOT > 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. Remove: http://www.tech-assist.org/remove.htm > > > >Set Vacation > > mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation > > > >Lost Password: http://www.tech-assist.org and select "Login > Problems?". > > > >Email Archives: //www.freelists.org/archives/techassist/ > > > > > > > > > > > > > > > > > > > > -------------------------------------------------------------------------- > > --- > > > This Email List is accessible to the general public through search > > engines. Remove: http://www.tech-assist.org/remove.htm > > > Set Vacation > > mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation > > > Lost Password: http://www.tech-assist.org and select "Login Problems?". > > > Email Archives: //www.freelists.org/archives/techassist/ > > > > > > > -------------------------------------------------------------------------- > --- > > This Email List is accessible to the general public through search > engines. 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