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Hitachi CM802U CRT monitor, Anyone know what IC I701 is?

Discussion in 'Electronic Repair' started by Doug Warner, Mar 19, 2007.

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  1. Doug Warner

    Doug Warner Guest

    Photo here: http://webpages.charter.net/dwarner2/I701.jpg

    Part of: Hitachi 21" monitor, model CM802U Manufactured June 1997

    Issue: Heavy vertical jitter for about 30 seconds during warm up,
    even after blank screen screen saver.

    Designation: I701,

    Location: Front center on main board.

    Markings: LA7860, 7BBS (no logo.)

    Identified it by selective cooling with compressed air, general areas,
    then through a couple feet of thin shrink tubing, then by dabbing with
    a swab soaked in freeze spray. screen shakes when the chip passes
    through a certain temperature range.

    1. Is this a common part, or some Hitachi ASIC?

    2. If I somehow managed to find a Hitachi servicer, would they replace
    the part, or the whole board (assuming they're still available.)?

    Yes, I could just buy a LCD display, but, to get the same real estate
    of my two 21" CRT's, I'd have to buy an (expensive) 30" widescreen,
    like the Dell 3007WFP..
     
  2. DaveM

    DaveM Guest

    Photo here: http://webpages.charter.net/dwarner2/I701.jpg

    Part of: Hitachi 21" monitor, model CM802U Manufactured June 1997

    Issue: Heavy vertical jitter for about 30 seconds during warm up,
    even after blank screen screen saver.

    Designation: I701,

    Location: Front center on main board.

    Markings: LA7860, 7BBS (no logo.)

    Identified it by selective cooling with compressed air, general areas,
    then through a couple feet of thin shrink tubing, then by dabbing with
    a swab soaked in freeze spray. screen shakes when the chip passes
    through a certain temperature range.

    1. Is this a common part, or some Hitachi ASIC?

    2. If I somehow managed to find a Hitachi servicer, would they replace
    the part, or the whole board (assuming they're still available.)?

    Yes, I could just buy a LCD display, but, to get the same real estate
    of my two 21" CRT's, I'd have to buy an (expensive) 30" widescreen,
    like the Dell 3007WFP..
    --
    Email reply: please remove one letter from each side of "@"
    Spammers are Scammers. Exterminate them.



    You can get one at http://www.ceitron.com/semi/semi.phtml?part=LA7860. Don't
    remember if they have a minimum order.

    --
    Dave M
    MasonDG44 at comcast dot net (Just substitute the appropriate characters in the
    address)

    Life is like a roll of toilet paper; the closer to the end, the faster it goes.
     
  3. PeterD

    PeterD Guest

    Didn't even bother to Google this did you?

    http://www.datasheetcatalog.com/datasheets_pdf/L/A/7/8/LA7860.shtml

    on the *first* Google hit.
     
  4. Doug Warner

    Doug Warner Guest

    Nope.. I was dead tired, and just plain forgot.
    Searched the next day, found the datasheet, (Deflection generator -
    fits the symptom) Found a dealer, ordered one.
    Also found a place to order a service manual (poor PDF scan for $15.00
    with zero disassembly info.
    Guess I'll have to dredge up my old TV repair skills,
    (Yes, I know how to discharge a CRT, and attach a clip lead to the
    2nd anode connection to keep the charge from rebuilding..)
     
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