#1
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TV Advice
We have an RCA 1985 ColorTrax 2000 Console TV. It was given to me FREE by a Gentleman who repairs TVs. I had it worked on a couple of months ago for a minor issue.
We have noticed as of late when we first power the TV Set on that we get a picture that starts out Dark then brightens up. Then the TV goes from a Brownish Green to a Real Dark Bright Green on the Picture Tube. Then the Picture displays 100% Normal. The colors after the initial warm up look really good yet. No Color Bleeds, or green tint etc in the picture. Also, still has a nice Bright Picture. This has the Chasis 131A in it. The Model# is GLR2538P. CRT is the A63ABP12X. |
#2
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The tube is getting tired and the guns don't track evenly when it's cold, Pretty common issue actually.
I have a couple 13" Color Traks from the same era and they do the same thing. |
#3
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I had a hard time rejuvenating an 80's inline gun CRT with my B&K 470. It was an '84 Colortrak 25".
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"If you wish to make an apple pie from scratch, you must first invent the universe." -Carl Sagan |
#4
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this crt wont take a jolt.its getting a little tired.try to set it up again and see how long you can get out of it.
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#5
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RCA Console 1985
The RCA Console TV I have is a 1985 Color Trax 2000. It has the Chasis CTC131 A. The Model of this particular set is GLR2538P.
I was wondering if anyone would have a Schematic on this Chasis to locate the adjustment for the Horizontal and Vertical? It needs adjusting. Thanks. |
Audiokarma |
#6
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Quote:
no width control. Probably has a few 'lytics just starting to open up. Width may also be pin problem either diode or regular cap shorted but sides usually will be bowed. Other problem is a classic case of CRT slow warming up. 73 Zeno LFOD! |
#7
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Quote:
As to the vertical, C501 and C510 both were commonly replaced caps in the vertical - a faulty C501 causes shrinkage from the top, and a faulty C510 would cause retrace lines at the top of the pix due to vertical foldover. We swapped them out as a callback preventer. U700 (the Chroma/Luminance/Video chip) would also cause changing colors as the set warmed up - most noticeably the red. RCA issued a Goldenrod aimed at chasing down other parts that could cause problems, to avoid changing out a good U700. In one test, they had you monitor pin 27 of U700 until the problem appeared - most often it would change to a lower than 5V value if U700 was bad, else some other part was bad. Among the culprits: R5076 on the CRT board - intermittent opens, cause loss of red in pix. R5074 on the CRT board - changing green levels, likely intermittent. Put a scope on all the supplies - the 16.5 volt source filter cap would open up, and cause all sorts of troubles - hum, wavy pix, lines in the picture (also could be the tuner/MST...) and no color. The CTC131 and 132 were great chassis, just had to weed out a few components...and yes, the CRT is probably tired. Only recourse there is a replacement.
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Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! |
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