Last group I purchased was from Digi-Key. They had other tv chips at very good prices too. Jerry Silverman Greentron Inc 4 Newland Ave Greenville SC 29609 Fax/Phone 864 232 3889 mail to: greentron@xxxxxxx ----- Original Message ----- From: <gulftech@xxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Thursday, August 04, 2005 1:19 PM Subject: [TechAssist] Re: RCA D52W20, ITC222, Convergence power supply problem > Jerry, > > Where can you buy them that cheaply? I used to buy them at Electro Sound > for 60 cents each, but they have been out of them for over three years. > A check of Tritronics shows them anywhere from $1.50 to $10.00. Most are > about $5.00. Even the TT-TLP621G is $1.49 each, or $1.29 for 50 or more. > Sorry, if it has "TT" on it, I won't buy it at all. > > > Ken Smith > Gulf Technical Services > 3034 Gulf Breeze Parkway > Gulf Breeze, FL 32563 > 850-934-8324 (Voice) 850-932-0819 (Fax) > > On Tue, 26 Jul 2005 11:57:53 -0400 "J Silverman" <greentron@xxxxxxx> > writes: > > If you buy generic ones in bulk they are only about $0.50 so it costs > > more > > to test than to replace. Costs a little less to test in circuit > > rather than > > removing. > > Jerry Silverman > > Greentron Inc > > 4 Newland Ave > > Greenville SC 29609 > > Fax/Phone 864 232 3889 > > mail to: greentron@xxxxxxx > > ----- Original Message ----- > > From: <gulftech@xxxxxxxx> > > To: <techassist@xxxxxxxxxxxxx> > > Sent: Tuesday, July 26, 2005 10:07 AM > > Subject: [TechAssist] Re: RCA D52W20, ITC222, Convergence power > > supply > > problem > > > > > > > Jerry, > > > > > > That is a truly outstanding suggestion. I have often wondered how > > I > > > could check an opto-isolator, but usually just replaced them if I > > had any > > > doubts. Bet I've replaced lots needlessly. > > > > > > May try to build a test jig with a socket, battery, limiting > > resistor, > > > and posts for a meter. > > > > > > You have helped many techs with that suggestion. > > > > > > Thank you, > > > > > > > > > Ken Smith > > > Gulf Technical Services > > > 3034 Gulf Breeze Parkway > > > Gulf Breeze, FL 32563 > > > 850-934-8324 (Voice) 850-932-0819 (Fax) > > > > > > > > > On Sat, 23 Jul 2005 14:28:31 -0400 "J Silverman" > > <greentron@xxxxxxx> > > > writes: > > > > That sound normal to me! If you put some current into pins 1 and > > 2, > > > > say from > > > > an ohm meter, then you should see some ohms appear at terminals > > 3 > > > > and 4, if > > > > your meters have the right polarity. > > > > Jerry Silverman > > > > Greentron Inc > > > > 4 Newland Ave > > > > Greenville SC 29609 > > > > Fax/Phone 864 232 3889 > > > > mail to: greentron@xxxxxxx > > > > ----- Original Message ----- > > > > From: <daryls_tv@xxxxxxx> > > > > To: <techassist@xxxxxxxxxxxxx> > > > > Sent: Saturday, July 23, 2005 1:20 AM > > > > Subject: [TechAssist] Re: RCA D52W20, ITC222, Convergence power > > > > supply > > > > problem > > > > > > > > > > > > > No... I don't have any schematics on this set. > > > > > I think I may have found the problem. I have absolutly no > > > > resistance > > > > readi= > > > > > ngs between pins 3 & 4 of the opt-coupler, even on high meg > > scale. > > > > > I will post the results when the part comes in. > > > > > Thanks, > > > > > Daryl > > > > > Daryl's TV > > > > > 2402 Wyoming Ave. > > > > > El Paso, TX 79903 > > > > > 915-565-9184 Voice/Fax > > > > > daryls_tv@xxxxxxx > > > > > www.angelfire.com/tv2/daryls_tv > > > > > > > > > > ----- Original Message ----- > > > > > From: Damon <damoneb@xxxxxxxxxxx> > > > > > To: techassist@xxxxxxxxxxxxx > > > > > Subject: [TechAssist] Re: RCA D52W20, ITC222, Convergence > > power > > > > supply > > > > prob= > > > > > lem > > > > > Date: Fri, 22 Jul 2005 22:20:41 -0500 > > > > > > > > > > >=20 > > > > > > Do you have schematics? If so, one of the transistors > > driving or > > > > being > > > > > > driven by the optoisolator can be jumpered (screwdriver) and > > > > maybe the > > > > un= > > > > > it > > > > > > will start, I'm pretty sure that if that's the case, > > replacement > > > > of the > > > > > > board will save you some time/money. > > > > > >=20 > > > > > > Damon B > > > > > > Telrad Electronics > > > > > > Fort Wayne IN > > > > > > ----- Original Message ----- > > > > > > From: <daryls_tv@xxxxxxx> > > > > > > To: <techassist@xxxxxxxxxxxxx> > > > > > > Sent: Friday, July 22, 2005 1:10 PM > > > > > > Subject: [TechAssist] Re: RCA D52W20, ITC222, Convergence > > power > > > > supply > > > > > > problem > > > > > >=20 > > > > > >=20 > > > > > > > After re-checking the power supply, I discovered that the > > > > chopper is > > > > not > > > > > > os=3D > > > > > > > cillating. I guess I was in a hurry and used the wrong > > ground > > > > as > > > > > > reference. > > > > > > > I rechecked every component on the primary side and still > > not > > > > finding > > > > > > anyth=3D > > > > > > > ing bad. > > > > > > > I thought I would sub another chopper into it but I > > couldn't > > > > find any > > > > > > cross=3D > > > > > > > for it. I hate to order one and wait several days only > > find > > > > out that > > > > = > > > > > may > > > > > > =3D > > > > > > > not be it. > > > > > > > Daryl=3D20 > > > > > > > Daryl's TV > > > > > > > 2402 Wyoming Ave. > > > > > > > El Paso, TX 79903 > > > > > > > 915-565-9184 Voice/Fax > > > > > > > daryls_tv@xxxxxxx > > > > > > > www.angelfire.com/tv2/daryls_tv > > > > > > > > > > > > > > > > > > > > > ----- Original Message ----- > > > > > > > From: Damon <damoneb@xxxxxxxxxxx> > > > > > > > To: techassist@xxxxxxxxxxxxx > > > > > > > Subject: [TechAssist] Re: RCA D52W20, ITC222, Convergence > > > > power supply > > > > > > prob=3D > > > > > > > lem > > > > > > > Date: Fri, 22 Jul 2005 08:00:20 -0500 > > > > > > > > > > > > > > >=3D20 > > > > > > > > Daryl, > > > > > > > > I have yet to see a defective convergence power supply > > on > > > > the ITC > > > > 222, > > > > > > > > HOWEVER..... > > > > > > > > The CTC 195/197 series has had intermittant conv power > > > > shutdown, and > > > > = > > > > > the > > > > > > > > board cost was cheap enough to just replace it entirely. > > It > > > > might be > > > > = > > > > > the > > > > > > =3D > > > > > > > way > > > > > > > > to go on this unit. > > > > > > > >=3D20 > > > > > > > > On the boards I worked on, I was able to eventually see > > it > > > > fail, > > > > then= > > > > > by > > > > > > > > jumpering two leads on the primary side I was able to > > > > restart it > > > > and > > > > > > ver=3D > > > > > > > ify > > > > > > > > it was the smps, and it was not a "shorting" type of > > > > failure. The > > > > > > oscilla=3D > > > > > > > tor > > > > > > > > just quits oscillating for no good reason. But in your > > case > > > > oscillati= > > > > > on > > > > > > > > isn't the issue, tranferring power to the secondary > > > > is......does the > > > > > > final > > > > > > > > output drive the transformer at all? > > > > > > > >=3D20 > > > > > > > > Damon B > > > > > > > > Telrad Electronics > > > > > > > > Fort Wayne IN > > > > > > > > ----- Original Message ----- > > > > > > > > From: <daryls_tv@xxxxxxx> > > > > > > > > To: <TechAssist@xxxxxxxxxxxxx> > > > > > > > > Sent: Thursday, July 21, 2005 6:18 PM > > > > > > > > Subject: [TechAssist] RCA D52W20, ITC222, Convergence > > power > > > > supply > > > > > > problem > > > > > > > >=3D20 > > > > > > > >=3D20 > > > > > > > > > RCA D52W20, ITC222, Convergence power supply problem > > > > > > > > > > > > > > > > > > Another looser here. > > > > > > > > > Customer claims they changed channels and lost the > > > > convergence. > > > > > > > > > What I found is no control of convergence and a > > distorted > > > > picture. > > > > > > > > > There are no voltages out of the convergence power > > supply > > > > on the > > > > > > > > secondarie=3D3D > > > > > > > > > s. > > > > > > > > > I do have power on the primary of the smps and does > > appear > > > > to be > > > > > > > > oscillatin=3D3D > > > > > > > > > g. > > > > > > > > > I checked all of the semi's, resistors and electro's. > > I > > > > ohmed out > > > > t= > > > > > he > > > > > > > > switc=3D3D > > > > > > > > > h mode power transformer. I didn't find any bad > > > > components. > > > > > > > > > I hope someone has encountered this before and can > > give a > > > > few > > > > > > pointers. > > > > > > > > > Thanks, > > > > > > > > > Daryl > > > > > > > > > Daryl's TV > > > > > > > > > 2402 Wyoming Ave. > > > > > > > > > El Paso, TX 79903 > > > > > > > > > 915-565-9184 Voice/Fax > > > > > > > > > daryls_tv@xxxxxxx > > > > > > > > > www.angelfire.com/tv2/daryls_tv > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > --=3D3D20 > > > > > > > > > > > > > ___________________________________________________________ > > > > > > > > > Sign-up for Ads Free at Mail.com > > > > > > > > > http://promo.mail.com/adsfreejump.htm > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -----------------------------------------------------------------------= > > > > > =3D > > > > > > > --- > > > > > > > > --- > > > > > > > > > This Email List is Public. 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