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Need RCA 1858-1 chip to save TV

My RCA TV, Model FMR722TR Chassis CTC 130/C SAMS 2574 Folder 2 that I bought in March 1981 has died.

Old faithful was working fine when my wife turned it off at night and would not turn on the next morning.

After going through all the test proceedures in the SAMS for power supply, horizontal, and high voltage it looks like the VIPUR regulator has died. 0.0 volts out of pin 6 with or without the load connected.

After checking my normal sources with no success I called the RCA distributor and was told they tried to order some of these chips two years ago and they were told they were no longer available.

Does anyone know of a source for one of these even a used one if good.

P.S. What brands are considered good among you professionals out there. I would want something from 27" to 36" but no plasma, LCD or Projection.

Van Gardner

Reply to
vangard
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snipped-for-privacy@worldnet.att.net wrote:

Reply to
cummings

I found Ness Electronics at:

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by using Google. When I searched on RCA 1858-1 I got a message saying no match found. Then I tried RCA 18581 and go the same message. Then I tried RCA18511 and got a match on RCA185110 which is a screw that is out of stock. What's the secret?

Van

Reply to
vangard

I found Ness Electronics at:

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by using Google. When I searched on RCA 1858-1 I got a message saying no match found. Then I tried RCA 18581 and go the same message. Then I tried RCA18511 and got a match on RCA185110 which is a screw that is out of stock. What's the secret?

Van

Reply to
vangard

The part number is 178274

Reply to
kip

HBF has it for less - about $22 delivered.

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Reply to
Travis Jordan

About $19 delivered at Moyer.

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Reply to
Travis Jordan

According to my old info, the part # for U2 on the vipur board is

164600 and is still available, but the chances of it bad are extremely slim. Have you replaced the 15uf cap C11 on the board? Very common, also shorted horiz output transistor from bad solder connections on the MTT tuner was common. IC not common, never seen one bad that I can remember.
Reply to
RonKZ650

Thanks to all you guys for the help. I just ordered one from Moyer for $18.09 total. I'll have to wait on UPS to see what I get.

Reply to
vangard

I kind of feel like you about the IC but I have run out of other things to try. I just removed C11 and it gives a good kick on my ohm meter and checks good on my ESR meter. I put in a 20uf 50V just to see if it made any difference and it didn't. I didn't have a 15uf.

I have the horiz output transistor Q402 removed and the gate of SCR 401 tied to ground per the proceedure in the SAMS to eliminate the High Voltage Shutdown or excessive current drain on the horiz output transistor from killing the regulator. Next it tells me to check the voltage on the cathode of CR7. There is no voltage there because there is no output on pin 6 of the IC U2.

The SAMS I have has some pages missing and I don't have the one that tells the part number of U2.

Van

Reply to
vangard

I received my chip from Moyers two days ago but didn't get to install it until today. My central air conditioning evaporator started freezing up due to low freon and not enough air flow. I had to cut into the plenium to get to it to clean it.

The chip fixed the TV much to my surprise. The new chip has the numbers CA1523E on it. It came with a Special Instructions letter from Thomson Consumer Electronics, Inc. It tells how to wire the jumpers JW6, JW7 and JW8 to trim the regulator output to the correct voltage. If anyone would like a Word .doc file of the letter send me an email with "RCA Special Instructions" in the subject and I'll gladly send you a copy.

Thanks to all who provided me with the part number and the URL to Moyer.

Van Gardner snipped-for-privacy@worldnet.att.net

Reply to
vangard

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