Tks for the guide Al; p5 of u4101 is ground.Is this a typo error?? Don of HARTS-TVCR-ASC 9 Robert St,Oromocto,NB,Canada,E2V3N2 Tel-506-357-9785,Fax-506-357-6010 hartstv@xxxxxxxxxxx ----- Original Message ----- From: "Al Gutz" <alg@xxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Saturday, July 26, 2003 12:42 AM Subject: [TechAssist] Re: RCA-CTC169AM,chass-f31221wn-32'' > Don > > Re RCA trouble shooting guide > > 1 check volts at u4101 p5 if > 2.5v IC is in overcurrent shutdown > > 2 Check volts at 4101 p16 if > 15V IC is in overvoltage shutdown > > 3 if p16 is between 10.5 to 15 v IC should operate > > 4 p3 should be < .6V if between .6 to .9 regulator will cycle on & off > > 5 check output of 4101 on P14 clock on P10 & 11 > > 6 To check IC remove AC and connect external PS to P16 scope above > points, > raise voltage to 10.5 volts and IC should begin to operate, do not > exceed 15V, as volts is changed the duty cycle scoped at P14 should > change > > > Al G > > hartstv@xxxxxxxxxxx wrote: > > > > Larry,Can't see how hooking up the HOT is going to help in t/s this power > > supply.Tks for offering to send the training manual but will fight this set > > on the week-end & see if I can find something I missed or over looked.BTY in > > a previous email I said nte 177,that should have read NTE 577.Tks again for > > your assistance.... > > Don of HARTS-TVCR-ASC > > 9 Robert St,Oromocto,NB,Canada,E2V3N2 > > Tel-506-357-9785,Fax-506-357-6010 > > hartstv@xxxxxxxxxxx > > > > ----- Original Message ----- > > From: "Larry E." <videotech@xxxxxxxxxxxx> > > To: <techassist@xxxxxxxxxxxxx> > > Sent: Friday, July 25, 2003 5:47 PM > > Subject: [TechAssist] Re: RCA-CTC169AM,chass-f31221wn-32'' > > > > > Don, connecting the collector of the HOT shouldn`t hurt anything in the > > standby > > > mode, Horizontal circuit is not active in standby mode, there is no drive > > signal > > > at the base of the HOT during standby, just B+ to the HOT collector and B+ > > > to the horizontal driver transistors collector (from the 15v line) That B+ > > should > > > > > > be checked in standby if you haven`t already confirmed it, I`ve seen the > > driver > > > transformer T4301 have bad solder connections and I`ve had a couple where > > > pin 5 was open or R314 was open killing the B+ to the driver transistor, > > but > > > that > > > shouldn`t cause the voltage to go up and down on pin 16 of U4101. Have you > > > tried pulling one end of the secondary diodes one at a time? (CR4118, > > etc.) I > > > can mail you the tech training manual and the troubleshooting guide if you > > want > > > me to, don`t know how much they`d help but it probably wouldn`t hurt . > > > Larry E > > > hartstv@xxxxxxxxxxx wrote: > > > > > > > Larry,yes C4118 was replaced & I tryed both a 177 & 580,but read that a > > 177 > > > > is a better sub??Really don't want to connect C of HOT until I get this > > p/s > > > > working properly.The Q4601 cct i will dive into again & see if I missed > > > > something........... > > > > Don of HARTS-TVCR-ASC > > > > 9 Robert St,Oromocto,NB,Canada,E2V3N2 > > > > Tel-506-357-9785,Fax-506-357-6010 > > > > hartstv@xxxxxxxxxxx > > > > > > > > ----- Original Message ----- > > > > From: "Larry E." <videotech@xxxxxxxxxxxx> > > > > To: <techassist@xxxxxxxxxxxxx> > > > > Sent: Friday, July 25, 2003 2:49 PM > > > > Subject: [TechAssist] Re: RCA-CTC169AM,chass-f31221wn-32'' > > > > > > > > > Don, if the original C4104 was 15uf @ 50v I would replace it with that > > > > value > > > > > Pin 3 is correct so that`s not the problem. You mentioned in another > > > > > post that you replaced CR4118 with a NTE177, that`s not a good > > > > > substitute, has to be an ECG/NTE 580, the C voltage on Q4601 > > > > > appears to be a problem, it should be a steady 13.1 volts in standby > > > > > did you check replace C4118 off pin 16 of U4101 yet? What > > > > > happens to the voltages in the switchmode if you connect the collector > > > > > of the HOT but don`t turn the set on? Larry > > > > > Larry Eastman > > > > > American TV & Electronics > > > > > Crystal River, Fl. 34428 > > > > > 352-795-0124 > > > > > > > > > > hartstv@xxxxxxxxxxx wrote: > > > > > > > > > > > Tks for your reply,Larry.Here are the values of the orginal caps > > removed > > > > > > from the smps; > > > > > > C4102=2.2ufd/100v > > > > > > C4104=15ufd/50v > > > > > > C4108=47ufd/50v > > > > > > The voltage at Q4101 is varying from 159vdc to 164vdc. > > > > > > The voltage on the collector pad of the HOT Q4401 is varying from > > 13vdc > > > > to > > > > > > 40vdc;NOTE this is without the collector of HOT connected to pad & > > yes > > > > I'm > > > > > > using the correct grounds. > > > > > > Pin 3 of U4101 is varying from 0vdc to .013vdc. > > > > > > I know there are hot & cold grounds for these measurements.The HOT > > > > collector > > > > > > voltage is low because the chopper is not in it's proper duty > > cycle.This > > > > is > > > > > > the same voltage measured at the cathode of CR4116,the 145vdc > > source. > > > > > > I did replace C4104 with a 4.7/100v cap,as per your email but have > > same > > > > > > voltage readings.What I don't understand is the orginal cap was > > > > > > 15ufd/50v.Man this is wierd?? Tks again for your help...regards... > > > > > > Don of HARTS-TVCR-ASC > > > > > > 9 Robert St,Oromocto,NB,Canada,E2V3N2 > > > > > > Tel-506-357-9785,Fax-506-357-6010 > > > > > > hartstv@xxxxxxxxxxx > > > > > > > > > > > > ----- Original Message ----- > > > > > > From: "Larry E." <videotech@xxxxxxxxxxxx> > > > > > > To: <techassist@xxxxxxxxxxxxx> > > > > > > Sent: Thursday, July 24, 2003 8:56 PM > > > > > > Subject: [TechAssist] Re: RCA-CTC169AM,chass-f31221wn-32'' > > > > > > > > > > > > > Hi Don, you need to be carefull changing parts in a 169 chassis > > with a > > > > pa= > > > > > > > rts list from a 27" proscan, there are 4 different families of 169 > > > > chassi= > > > > > > > s`s and some of the parts > > > > > > > are very different, for example C4108 in your set (family 1) is > > > > supposed = > > > > > > > to be a > > > > > > > 47uf @ 50 volts but in a family 4 169 it`s a 39uf @ 100v, BIG > > > > difference= > > > > > > > =2E > > > > > > > The usual cause of pin 16 on U4101 fluctuating up and down is the > > 3 > > > > caps = > > > > > > > you changed, or U4101 is bad check the values, C4102=3D 2.2 @ 100v > > > > C410= > > > > > > > 4=3D 4.7 @ 100v(not 47uf) C4108=3D 47uf @ 50v. If those are good > > then > > > > th= > > > > > > > e set is either in ovp or ocp You should have the following in > > standby > > > > (s= > > > > > > > et plugged in but not turned on), Raw B+ on C of Q4101 =3D approx. > > 165 > > > > vo= > > > > > > > lts, Regulated B+ on C of HOT=3D approx.144 volts, 5v standby on E > > of > > > > Q46= > > > > > > > 01. If the above are correct, check voltage on pin 3 of U4101, it > > > > shouldn= > > > > > > > `t be above .6v (point 6 volts) if it is the > > > > > > > set is going into ocp shutdown. Let me know the results of these > > > > measurem= > > > > > > > ents, > > > > > > > I don`t have a scanner but I do have the schematics and 169 > > > > troubleshooti= > > > > > > > ng guide. > > > > > > > Remember that a lot of the capacitor values are different for the > > > > various= > > > > > > > 169 models > > > > > > > so be careful to replace what you pull out with the same value, > > Larry > > > > E > > > > > > > Larry Eastman > > > > > > > American TV & Electronics > > > > > > > Crystal River, Fl. 34428 > > > > > > > 352-795-0124 > > > > > > > pulling out > > > > > > > hartstv@xxxxxxxxxxx wrote: > > > > > > > > > > > > > > > This direct view 32'' unit has me baffeled.Orginally came in > > with > > > > the H= > > > > > > > OT shorted.Replaced with an OEM 2SD1885.Everything else was ok so > > > > fired i= > > > > > > > t up.The HV was 38.5KV,too hi,so took the chass out to bench > > > > test.Turned = > > > > > > > it on without a yoke plugged in & I think that's when my problems > > > > started= > > > > > > > =2EQ4802 smoked in the pin cct.Replaced it & plugged a yoke to the > > > > set.No= > > > > > > > w my smps won't start.Pin 16 reads 8.5vdc then slowly goes up to > > > > 10.5vdc = > > > > > > > & then starts going back down to 8.5v.So changed all the normal > > parts > > > > for= > > > > > > > this smps,ie,the U4101,C4102,4,8,Q4101.Did not help.Replaced the > > > > infamou= > > > > > > > s CR4118.Checked or replaced both LM311 in the vert & pin cct;also > > > > C4403,= > > > > > > > CR4401,CR4402.Again no go.Checked or replaced all trans in the PWM > > > > cct,Q4= > > > > > > > 405,6,7,8,9.Same results;the regulator is trying to start but > > keeps > > > > going= > > > > > > > up/down from 8.5v to 10.5v.Raw B+ is solid at 165vdc,no > > ripple.All > > > > these= > > > > > > > tests were done with HOT collector lifted.I have checked all my > > tips > > > > for= > > > > > > > this unit,& I know there's a ton of them but > > > > > > > > can't find the problem.I have changed so many parts too > > numereous > > > > to = > > > > > > > mention,ie caps,diodes,transistors but I'm stumped.Any assistance > > > > would b= > > > > > > > e greatly appreciated or if someone would be so kind to email a > > pdf > > > > for t= > > > > > > > his brute.The only print I have is a profax for the 27'' set.BTY i > > > > also c= > > > > > > > hecked all transistors in the Q4300 & Q4700 > > > > series.........TIA...........= > > > > > > > =2E > > > > > > > > Don of HARTS-TVCR-ASC > > > > > > > > 9 Robert St,Oromocto,NB,Canada,E2V3N2 > > > > > > > > Tel-506-357-9785,Fax-506-357-6010 > > > > > > > > hartstv@xxxxxxxxxxx > > > > > > > > > > > > > > > > > > > > ***********************************************************************= > > > > > > > ****** > > > > > > > > Classifieds! 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