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Thread: Sanyo CP29FS2 Service Menu?

  1. 08-07-13, 10:24 PM #1
    Hysteric
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    Question Sanyo CP29FS2 Service Menu?

    Old tube TV started behaving funny with it's image (zig-zags where boxes should have straight lines), but by chance a family member gave me this huge Sanyo TV with the product number on the back reading as CP29FS2.

    The video is slightly cut off around the left/right, and I suspect on top/bottom somewhere as well. Can't find anything for zoom in the standard menu (very simple settings there), any chance someone knows of a way to tweak video via a service menu of some sort?

    I've attempted Method #2 listed but unfortunately it didn't work. Can't try Method #1 because I don't have a TV remote for it. Been scouring Google for documentation and haven't had any luck. Anyone here able to help fellow Aussie?
    Last edited by Hysteric; 08-07-13 at 10:26 PM.
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  • 12-07-13, 07:52 PM #2
    TVguy
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    G'day Hysteric,

    Not very likely that this problem is due to a setting in a service menu. You may have a fault in the EHT stage where the voltage can rise due to an open circuit flyback tuning capacitor, resulting in reduced picture size. The same effect can be caused by a high HT rail also resulting in increased EHT. An image would be helpful .

    Your previous TV problem, from what you describe sounds like horizontal tearing or "squegging", generally caused by poor supply line filtering due to electrolytic capacitor failure (look for a 100 uF 160V cap near the PSU switching transformer). The phenomenon is result of asynchronous ripple interacting with the horizontal frequency of 15,625 Hz. As a bit of history, for many years CRT TV switching power supply converters were locked to the horizontal frequency to preventing squegging. Also look at the supply decoupling around the horizontal driver stage as this is a high current amplifier needed to drive the horizontal output transistor with sufficient base current (typically 1 to 2 amps) due to the low Hfe of power BJTs.

    Cheers
    Last edited by TVguy; 12-07-13 at 08:02 PM.
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  • 14-07-13, 09:46 PM #3
    Hysteric
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    Hi TVGuy,

    That's a lot of technical terms beyond my knowledge there, I'm good with computers but the concept of opening up a CRT scares the living daylights out of me. :/

    I'll try to get an image showing what I'm seeing but I don't have a decent camera. Had to get rid of the other TV too: the family unit has a very intolerant stance on hoarding, especially when we've already got a few tiny tube TVs lying around.
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