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Toshiba TV model 27A44, Regulated B+ Info

Discussion in 'General Electronics' started by Brad, Dec 3, 2008.

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  1. Brad

    Brad Guest

    Hi,

    I have a Toshiba TV (27" pic) model 27A44 (mfg. 05/04) in my TV service
    shop (no SM). Customer told me the TV "sparks" once in awhile, then turns
    off. It didn't do it in the shop yet, but checking the HV, it was 30KV
    (higher than normal). I checked the regulated B+ and it measured +122V!
    Unfortunately, there is no marking on PCB that indicates what this voltage
    should be.

    I removed and tested the timing capacitors in the horizontal output
    circuit. Sometimes an open capacitor will cause the HV to go higher
    than normal. They tested just fine.

    130V is very common in my experience, but can someone tell me what the
    regulated B+ should be in this model TV?

    Thanks in advance, Brad

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  2. neon

    neon

    1,325
    0
    Oct 21, 2006
    no matter what the b+ is the HV comes from a 1-2v source. and the b+ whether right or wrong shoul'd boost the HV to 30kv. and to me 130v is not much for a 27" put a load and see if it regulate if it does then it is correct and look into your real problem hi HV
     
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