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#1
02-23-2021, 09:08 PM
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1996 RCAColorTrax TV Service Menu
My 1996 RCA Console Colortrax TV is in the Service Menu Mode. When I turn the TV On it clicks ON and Off and On and Off about 3 or 4 times. I have no sound or picture. I sometimes can get it to come on and after clicking on and off it will have sound, but my picture is rolling as its evidently in the Horizontal and Vertical Adjustment Mode. I do not know how to get my Picture back and to get back to the Service Menu to adjust back to where it was.
Thanks. 
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#2
02-24-2021, 03:42 AM
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My Question is What Model is It????
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#3
02-24-2021, 06:41 AM
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The service menu isn't going to help you. Even if you can get just the vert and horiz readjusted, I can promise you that there are parameters all over the place that are kludged.
You've got a corrupt eeprom caused by bad grounds in 1) the tuner, 2), the LV regulator heatsink ground tab and 3) the horiz output heatsink ground tab. When these used to come in, I wouldn't even open them up. I'd call them a couple of hours later and give them the estimate, then repair and upgrade the chassis. I would do between 5 and 10 of these a day including several from other servicers. Towards the end of their run, that series of chassis also had two electros in the power supply that had to be changed as well. I don't know if anyone on youtube has the procedure videoed, but the tuner grounds must be done immediately along with the heatsink ground tabs. If you were to install a new eeprom, or realign the original eeprom, it would end up being corrupted in minutes. John
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#4
02-24-2021, 07:05 AM
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The TV was in the TV Shop in January. They repaired the grounds on the chassis, etc.
He ran short wires where needed to repair grounds. It must just be time to retire this one.
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#5
02-24-2021, 08:56 AM
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Quote:
Now, in an analog TV, there's no such thing as a preprogrammed eeprom as every part has a slightly different tolerance including your CRT (even if they didn't age). The pre-programmed eeproms were loaded with values that were an average taken from a dozen properly running chassis. Of course it won't be optimized for your chassis, but they'll get you a picture for sure - probably a decent one. You'll have to touch up the gray scale and vert height, center, horiz width and centering etc. to improve it. I had to do several tuner alignments on TVs that had a previously installed pre-programmed eeprom in them done at other shops. Even a digital varactor tuned circuit has knifed coils and even varactor diodes have different curves. If he has the eeprom, he'll give it to me and I'll mail it to you. It's an 8 pin chip that isn't difficult to change. You can always put a socket in before putting in the new chip. John
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#6
02-24-2021, 07:34 PM
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Last ditch that works most the time.
1) Do the resoldering first Be careful in that tuner ! 2) install socket for e-prom. 3) install NEW eprom & start the set. 4) while the set is running carefully put in the old one. Now you can get the old numbers to try on the new one. Above all WRITE DOWN ALL NUMBERS. DO NOT go above any peramiters. Dont know if it helped but I also ran a ground wire from the tuner shield to the eprom. Never had a recall after that. 73 Zeno  LFOD !
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#7
02-24-2021, 09:59 PM
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This set has the CTC177AM2 Chassis in it. I can also get model number of TV if that helps too. The chassis in it isn't the original chassis as that number on back of TV differs from the actual chassis inside the cabinet.
Thanks.
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#8
02-25-2021, 08:12 AM
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If you leave TV unplugged for a period of time and then reconnect to outlet then turn the power button on it briefly powers up then shuts down as soon as it comes on. There is the visible green dot in the middle of CRT when it clicks off like it shows after powering set off after using it. Then it does the click click click.
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#9
02-25-2021, 09:40 AM
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Quote:
John
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Hybrid Mode
