Question about Toshiba 40H80 40" Rear Projection Television

1 Answer

40wh08b convergence problem

Hi experts,
had tv since oct 2000 ......couple of months ago on switch on had the odd grouping of what appeared to be flyback lines but only in small area of screen [not all the way accross].....this problem did not show all the time.intermitant.....ABOUT 4 days ago this problem disappeared and now the tv has a bent picture DOWN at bottom left...bent UP at top right of picture........this means that the RED and BLUE are out of syncronisation by as much as 1.5 inches ie showing a blue and red picture outline......the centre of pic and top left and bottom right still appear okay.....normal convergence adjustment will not sort this........shame to get rid of...tubes /guns still good and strong.......pic still very good ...........HELPPPPPPPPPP
bernard

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  • 5 more comments 
  • bbd750 Dec 27, 2007

    hi,
    bernard here.thanks for info...ps live in uk england......been looking at other peoples similar problems.....ic numbers different ie stk392-150
    stk392-160
    stk392-110t
    and your part stk394-160e
    or hitachi pt cz 01341

    silly question are they all correct
    is stk394 correct or should it be stk392

    i can solder.....but havent taken on this task before ....any more advice/tips to ensure smooth installation.....is there any special setups to do after installation which would require advanced menu access...finally TV SAFETY --only thing i understand is earth myself and apply limited heat to ic.....any further tips..
    thanks bernard

  • bbd750 Dec 28, 2007

    hi,
    took back off tv ......had very close look at ic's.....soldering looks superb.....18 solder points per ic.......GULP
    number is STK392-110 on both
    tv model is for european market 40wh08b this is the 100 htz model with built in 5.1 dolby digital system ....thanks for your patience...couldn't access site earlier ,just kept taking me to a main page on how to become an expert and earn money!!!!
    looking forward to your reply .
    bernard

  • bbd750 Dec 28, 2007

    hi,
    looks like you recommend ic's 160e...but if i have trouble obtaining these could i use 110/110t or even 150 as long as good make..original 110's have been in for 7 yrs

    okay i found ic,s but possibly not that good to identify what you say is B+ feed resistors .....any help identifing them ie size shape etc and how many am i looking for
    ps
    had good look at all components both sides of ic's nothing looks burnt or discoloured......but still don't know if i was looking at B+feed resistors...are they on ic side or heat sink side....2 x sets of 6 green components behind heat sink 3 x small 3 x large [2 sets] and 2 x black cylinder components [total 4]either side of ic/heat sink..........starting to show my ignorance now......HELP
    ps its 3.28 in the afternoon here do you go to sleep!!!!!!bernard

  • bbd750 Dec 28, 2007

    hi,
    me again.....your last comemt 10 am friday implies i have been looking at resistors.......ive had a test run and had full panel out of set after removing all wire connectors and re installed unit to check still works [albeit with convergence fault]
    finally any more tips see my 1st reply /coment ....do i have to use any special/advanced menues to set up after installation of ic's or just normal convergence menu....ALSO is there a stk392-110E available as an alternative to the 110T
    thanks for your help
    bernard
    signing off as its nearly 12 at night here
    ps petrol is equivalent to $9.40 a gallon here ---any suggestions on FIXING THIS !!!!!

  • bbd750 Dec 29, 2007

    hi,appreciate all your help..........final query...looks like i've seen pictures of a bonding paste between ic's and heatsink to transfer the heat..........do you use this..what is it ...what is product called..and would it be something to obtain via my ic supplier......
    ps was i looking at the resistors!!!!!!!!!!!
    bernard

  • bbd750 Dec 29, 2007

    hi,
    final final query
    i noticed other sites state stk394-250 is the direct replacement for the stk392-110
    do you have any thoughts/comments
    also just to reiterate and go back to first posting
    this tv is and will converge on most areas of the screen
    it is only the top right quarter and bottom left quarter that shows this problem...in those two areas on convergence menu [which puts 9 numbered markers and a large cross in centre of screen to assist manual alignment] i can adjust blue and red left and right but not up and down.........can i take it that this is in line with ic failure and that only random areas of screen can/will be affected by this ic failure.....
    any more info on the resistor numbers and ohms of each resistor as i may choose to replace at time of ic installation...
    i appreciate your patience in answering all these on going reply/comments.....not all us limeys are the same
    bernard

  • bbd750 Dec 29, 2007

    thanks for the reply...but could you possibly look at the rest of my last posting
    ie about resistors and convergence as you seemed to focus onto only first third of this comment/reply.......
    sorry to pester you again but if you are unable or can't answer these points then just say .

    thanking you in advance and asking you to remember that your the expert and what might seem simple to you may need a little more info /help with as we say [putting the meat on the bones] for us thickies

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Convergence IC's need replacement = STK392-110 original #...
Use name brand Toshiba, NAP, or upgrade to STK394-160E
Hitachi part # CZ 01341...no cheap generics..they won't hold up..
Chassis pull and some precision soldering will be needed....let me know if you need further info...........................T.

Posted on Dec 27, 2007

  • 6 more comments 
  • Vista Electronics Dec 27, 2007

    Bernard,

    Thank you for your ? 's and comments...all info is helpful.....

    1) Remove back of set and look at large heatsinks with IC's

    on them.....what is the number on the originals ?



    2) Verify model # off back of your tele......



    Caution: Before ordering parts,we can discuss which IC's are

    "best" and what will waste your time and labor........T.

  • Vista Electronics Dec 28, 2007

    Thank you for your reply !

    1) Toshiba STK392-110 subs to STK392-110T ( ok to use )



    2)Hitachi brand has an upgrade ...over the last couple of years ..

    STK392-110 sub STK392-150 sub STK394-160E ( upgrade )

    Therefore, the best, but not cheapest is....

    STK392-110 original sub to STK-394-160E = Hitachi part #

    CZ 01341....I use several pairs of these per week.......



    3)Next,you should examine carefully the B+ feed resistors next

    to the IC's for burn or over-heating....usually visible....T.

  • Vista Electronics Dec 28, 2007

    No rest for the weary !

    Sounds like resistors are ok.........use quality IC's of your choice

    and go to work !...............................T. I0:00 AM Friday

  • Vista Electronics Dec 29, 2007

    No special prep.......STK392-110 is generic description = each

    MFR has their own Part #....Toshiba,Philips,Hitachi.....I only

    recommend Original Equipment Manufacturer ( OEM ) parts..

    anything else ...you are on your own...



    PS. 100 pounds or 100 dollars....which one has more value ?

    Your choice is...........??............T.

  • Vista Electronics Dec 29, 2007

    I use heatsink compound on each of the STK's I replace..T.

  • Vista Electronics Dec 29, 2007

    Final,final,final comment !!!

    Remember : STK392-110 is the common description of the

    most common convergence IC used in most such repairs today.

    Best replacement is HITACHI PART # CZ 01341.......

    STK392-250 is a common IC.....If you use it as a sub for -110,

    Who says it is a quality sub ? What Manufacturer ? What is their PART # ?? One more example = TOSHIBA STK392-110 subs to STK392-110T = TOSHIBA PART # 23135090

    ....................T.

  • Vista Electronics Dec 30, 2007

    Replace the IC's and your convergence problems should be

    solved................I don't usually change any resistors unless

    they are visibly damaged.....If I need to know the value I look

    with a magnifier at the resistor, as my eyes aren't what they used to be...or

    I look in the service literature if I have it....or I call the parts

    supply armed with the board location and they assist me...or

    I research on the internet............................................but,

    many times,there is no resistor damage...........................T.



    Bernard,

    If you don't feel qualified to DIY ( do-it-yourself), you might

    want to hire a tech......at least you have the info to ask the

    proper questions ......Terry.

  • Vista Electronics Dec 31, 2007

    Bernard,

    Thank you for the Fixya ! rating.........let me know the final outcome.........Terry.

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