My Toshiba CZ27V51 television won't turn on - all we get is a blinking red light by the on/off button.

Testimonial: "Very Helpful information and willingness to help."

• by SD Tech Over a year ago

1. • By SD Tech Jan 02, 2010

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     What you will need;
     
     Two new STK-392-110 convergence Ic’s
     
     Solder
     
     Liquid solder flux
     
     Desoldering braid or wick
     
     A good soldering Iron
     
     Some denatured alcohol
     
     A small toothbrush
     
     A Philips screwdriver or screw gun to REMOVE SCREWS
     
     A PAIR OF GLOVES
     
     
     

     
     
     1. UNPLUG TV SET.
     
     
     2. Remove back cover of TV set.
     
     
     3. Remove entire front speaker
        grill on set(it pulls off and may resist being removed)
     
     
     4. Locate and unplug speaker
        wires (they are plugged into the main circuit board).
     
     
     5. Locate three cables with wires
        that come from the Front keyboard—two of them have to be unplugged from
        the main board(all plugs are different sizes but note where they go)
     
     
     6. Remove 2 long philips silver
        machine bolts from the front of the set (behind the grill).
     
     
     7. Remove 4 more in the back of
        the set; two are located at the extreme back edge of the plastic frame and
        hold the chassis down; two more are located on either side and also go
        straight down; note which are which and set them aside.
     
     
     8. Using gloves pull the entire
        metal box (it is called a light box) out of the set; there are hand holds
        on either side—careful as the metal has sharp edges.
     
     
     9. Remove the box from the set
        and locate the two Convergence IC chips; they are located on identical
        metal heat sinks with fins and they should have the STK-392-110 number
        clearly printed on them in white (they are black)
     
     
     10. Turn the light box over on
         its side and UNSOLDER ALL 18 PINS ON EACH IC. It is a good idea to apply
         liquid solder flux to the pins on both chips now. I recommend using a
         de-soldering braid for this—get all the pins completely de-soldered.
     
     
     11. Inspect the dozen or so light
         blue resistors in front of them; most are marked 2.2 ohms—if any are white
         in the middle you will need to replace them at the same time; best way is
         to check all of them like checking a fuse----they protect the set if one
         of the STK’s shorts in any way.
     
     
     12. With the STK’s completely
         unsoldered turn the box upright and remove the two screws on each IC. If
         the chips have never been replaced you will need to tap them loose with a
         putty knife or flat bladed screwdriver.
     
     
     13. Remove both IC’s.
     
     
     
     
     

2. • By SD Tech Jan 02, 2010

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     1. Apply heat sink grease to the
        two new IC’s and install them one at a time; this part can take some time
        and it is important the pins on the new IC’s are perfectly straight---once
        you get them in, Hand tighten both the screws on each IC---do not use a
        screw gun—you can strip the screw holes out. Clean the bottom of the
        circuit board where the chips were soldered with some denatured alcohol
        and apply liquid solder flux to all the pins.
     
     
     2. Presuming you have already
        found/replaced any bad resistors turn the box back over and solder
        carefully both of the two new IC’s in, --do not short any of the pins to
        each other when you do this and when you are done it is a good idea to
        take a close look at both to make sure all pins are soldered and not
        touching each other with soldering you have just done. I suggest you do
        clean the pins on the bottom of the circuit board again with denatured
        alcohol.
     
     
     3. Slide entire light box back
        into the cabinet.
     
     
     4. Reconnect the plugs you
        removed when you removed the box. At this point take a lens cloth or a
        paper towel with glass cleaner sprayed on it and clean the three large
        black lens-if they are dusty the picture will be darker and not as clear
        as is should.
     
     
     5. Position the box so it is all
        the way in place and none of the wires or plugs are pinched.
     
     
     6. I usually at this point turn
        the set on before I replace the Six bolts that hold it in—2 from the front
        and the four in back----this way if you have a problem you can remove the
        box faster.
     
     
     7. If the set comes on and now
        has normal Convergence go into the customer menu and adjust the
        convergence in the multi-point mode----CAREFUL! THE FIRST OPTION this set
        usually offers is a green cross in the middle of the screen—do not adjust
        Green!
     
     
     8. Once you have the Red and
        Blue in the center adjusted find the second convergence mode---it will
        give you 8 or nine points on the screen with instructions on how to change
        from blue to red---use the original remote with the thumb wheel or cursor
        buttons to adjust.
     
     
     9. NOTE: SOME of these sets need
        to have the Convergence adjusted in first: full/4:3 and second in the
        other two zoom/wide zoom and third on the HD input with a HD signal coming
        in. There is also an option at this point to go into the Technical menu
        and fine adjust the convergence all over the screen—if you need this I can
        give you instructions based on the model you have—most of the time
        adjusting the set in the customer mode will produce a good result.
     
     
     10. I know all this may seem
         complicated to you, but this repair should take about an hour or so and
         just take your time when you get to adjusting the set.
     
     
     11. If all looks good turn the
         set off and Unplug it; install all 6 of the chassis bolts back; replace
         the back cover and the Speaker grill and plug the set back in.
     
     
     12. You may find it useful to go
         over the convergence Adjust again—to get all the points as good as you
         can. There is a hidden Tech menu that will allow a finer adjustment of the
         entire screen----it is somewhat difficult to access and there are a lot of
         buttons on the remote that then do different things.
     
     
     Most of the time adjusting in the customer menu will
     give you a very acceptable picture
     
     

3. • By SD Tech Jan 02, 2010

   • These are the instructions---ignore the true/false stuff--there because document was composed in MS word.
     
     Copy and paste and save. On EBAY--select advanced search, then to the left search by seller sewsales55 is the seller I buy from---SUBURBAN ELECTRONICS in Maryland.
     
     You can find a pair of the chips and some of the other items there--if you want to upgrade from the 392-110 chips--use STK-392-150 ---SAME PART BUT LONGER LASTING.
     
     LET me know if you have any questions or need advice.
     
     
     SD TECH
     
     
     

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