90s Philco-branded Philips 13" - Very dark screen
I have rescued a 13-inch Philips (Magnavox) CRT TV set, probably built in the mid-90s (build date is obscured by wear on the label) from an abandoned motel. I kept it mostly because of the curiosity of the set being branded Philco, despite that brand having ceased television manufacture decades prior. After thoroughly cleaning the TV and checking for any obvious signs of trouble, I plugged it in and powered it on. All seems well, but the picture is extremely dark, to the point of being almost totally black. I tried adjusting the flyback G2 control, and although this did produce a picture, it was very washed out, as though something before the flyback is keeping the picture dark. I also tried adjusting the sub brite control on the board, to no avail...I am out of ideas. I returned the flyback to its previous setting, to avoid any undue wear.
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Model number? Sams doesn't yield without that or a chassis number.
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Philco existed as a elcheapo badge into the DTV transition...Those magnavox DTV converter boxes were also sold in white plastic with Philco brand on them.
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Post the CRT voltages & its easy to nail down the bad stage.
With its history its probably a dead CRT. 73 Zeno:smoke: LFOD ! |
My late Grandmother in Athens had a knob tuned Philco set from that era. Was a reasonably basic model that screen size or a bit bigger. Had a nice picture. Ad slogan from Knoxville, "Philco, What A Picture, What a Price". Also, they used "Philco, Your Better Buy".
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I may have the SM for the Y series. I'll take a look when I get to work. John |
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I figured I'd try to take some photos and show what I'm dealing with. (Hard to take images that accurately show the dark screen, but I promise you, Super Mario doesn't usually look this satanic.) As you can see, the onscreen menus and OSD are fine...it's the image itself that is dark.
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A service manual (rather it be a Sam's Photofact or factory manual) will be a big help. It could be something as simple as a dried out electrolytic capacitor in the video chain.
As far as the Philco name, Ford bought them in, I believe, 1961. Then, Ford sold Philco to GTE (who already had Sylvania) in 1974. At that point, Philco and Sylvania TV's were basically the same inside; but, the Philco-branded sets were the "loss leader." In '81, NAP (who already had Magnavox) bought the Sylvania and Philco brands from GTE. I believe NAP still owns the rights to the Philco name; but, they have licensed the Philco, Magnavox, and Sylvania brands to Funai and other outfits. |
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Depending on the year, it could be a delay line of sorts or a rudimentary comb filter issue. Some TVs had a service switch of sorts on the CRT module. It will be a small three position switch if it has one. Some had a similar switch on the chassis somewhere, but those were mostly imports. If you can find one, try all three positions. John |
Will do some more tinkering and troubleshooting tonight. I DO have a scope, but don't really know how to use it.
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I think the details that do show are too sharp to be chrominance. So, there is something wrong with the luminance level (brightness/black level/DC level, whichever you want to call it).
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