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CTC187 revisited

Discussion in 'Electronic Repair' started by James Sweet, Mar 22, 2008.

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  1. James Sweet

    James Sweet Guest

    Made another attempt at this pesky thing tonight after sitting on it for
    ages. Came to me with hourglass distortion, fixed that but the picture is
    still too wide and some faint retrace lines are visible. C4403 has been
    replaced, IIRC I ordered the actual RCA part, marked .55J250. The other two
    blue brick caps in the pin circuit test good, and CR4403 is fine as well.
    What else should I look at? All the info I've found points to parts I've
    already checked or replaced.
  2. James Sweet

    James Sweet Guest

    Quick followup. I found a bad filter cap on the B+, replaced that and no
    difference. Voltage is spot on at 140V with the set operating. Picture is
    too large in both directions judging by the OSD.
  3. Dani

    Dani Guest

    Faint retrace lines, especially of one color, MAY be the Jungle IC. I
    had a lot of them go..looks like a bad CRT. Check the voltages on the
    red, green, & blue wires from the CRT PCB by the Jungle IC. I'm sure
    you know this, but maybe B + is high (pix too big all sides), or maybe
    someone "tweaked" the EEPROM. Dani.
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