Toshiba TW40X81 convergence


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Toshiba TW40X81 convergence

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carnut
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Jul 26, 2008, 6:32 PM

Post #1 of 10 (3520 views)
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Toshiba TW40X81 convergence	Can't Post

I just discovered this site. Very informative!! I've read many threads today regarding convergence issues with the majority stating to replace the 2 IC's. My TV is 8 years old and just started having issues with the blue, yellow alignment. If the TV is tapped on the upper corner, the blue cross hairs will quickly jump to the other side of the white cross hairs and allow some minor convergence realignment thru the remote. It acts like a cold solder connection I believe. This TV was stationary for 6 years in one room and was recently moved 50 miles in the bed of a truck to my residence. Am I correct in assuming resoldering these IC's is a proper first step? Or should I remove them based on age and replace them or just reapply the heat sink compound? and resolder. Thanks for any guidance!

techchris
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Jul 26, 2008, 8:25 PM

Post #2 of 10 (3514 views)
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Re: [carnut] Toshiba TW40X81 convergence [In reply to]	Can't Post

this sounds like bad solder joints on the STK.... convergence ic's. Resolder all the pins soon or it may destroy them completely and you end up changing them which is a tricky job unless you are good at soldering.

carnut
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Jul 26, 2008, 9:19 PM

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Re: [techchris] Toshiba TW40X81 convergence [In reply to]	Can't Post

Thank you for the quick response and confirming what to do first.

Repair man
Enthusiast

Jul 29, 2008, 2:28 AM

Post #4 of 10 (3493 views)
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Re: [carnut] Toshiba TW40X81 convergence [In reply to]	Can't Post

That is excellent advice from techchris I'm sure he has given you the best advice. One other thing you might want to check while you are in the back off the set soldering and that is to make sure all plugs on jumper wires are seated properly. You mentioned you just moved the set, often plugs will work their way loose. Be sure to check any plugs near the convergence IC closely as well as any from one board to another. -- Dan

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carnut
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Aug 7, 2008, 12:58 AM

Post #5 of 10 (3477 views)
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Re: [Repair man] Toshiba TW40X81 convergence [In reply to]	Can't Post

Well, yesterday I had a computer repair man heat and reset all pins on both IC's. 2 pins looked suspect he said. Now after leaving the set unplugged overnight and when turned on, it will slide the blue and yellow to the right a good inch, then after 15 min. of use will quickly reconverge and be great all the remainder of the day? Tapping on the TV will affect the amount of misalignment to the right it has. Sometimes quickly shifting the blue/yellow to the left allowing me to center both the red and blue cross hairs. Would it be smart to heat ALL solder joints on this board or just replace the board? If another board where does one get a part number?

Repair man
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Aug 7, 2008, 2:52 AM

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Re: [carnut] Toshiba TW40X81 convergence [In reply to]	Can't Post

It sounds like just bad solder joints to me. When the ICs heat up they will either make contact or often break contact causing the symptoms you've described. If I was repairing it, I would resolder all pins of both ICs as well as any connections to resistors and any other parts within 1 - 2 inches around the ICs. In you case with it acting up when the set is cold and after warming up it's OK, what us techs use is a non-conductive spray called 'super cold'. This super cold spray will cool down a very small area at a time forcing the set to act up as if it was a cold condition (like before parts warm up from the set being on). If you have a local repair shop around you cold pick up a can and try spraying small areas at a time and find the bad point that way or it is far cheaper to just resolder the points described above. If you or anyone reading this post needs cold spray you can get some if you Click Here -- Dan

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(This post was edited by Repair man on Aug 7, 2008, 2:54 AM)

carnut
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Aug 8, 2008, 8:44 PM

Post #7 of 10 (3458 views)
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Re: [Repair man] Toshiba TW40X81 convergence [In reply to]	Can't Post

Is it reasonable to expect having to do a service mode re convergence once these IC's are replaced? I ask because the only button that does not work on my 1999 original remote is the MUTE button!

Repair man
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Aug 9, 2008, 4:46 PM

Post #8 of 10 (3456 views)
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Re: [carnut] Toshiba TW40X81 convergence [In reply to]	Can't Post

I still say it's bad solder joints.

You said ... "after leaving the set unplugged overnight and when turned on, it will slide the blue and yellow to the right a good inch, then after 15 min. of use will quickly reconverge and be great all the remainder of the day"

You also said... "Tapping on the TV will affect the amount of misalignment to the right it has. Sometimes quickly shifting the blue/yellow to the left allowing me to center both the red and blue cross hairs."

No amount of adjustment will correct these symptoms. Once you have the bad solder joints fixed these symptoms will stop. Then if you need to you can adjust convergence using service mode (but only if needed) Do not mess with service mode unless needed, often you can do more harm than good -- Dan

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(This post was edited by Repair man on Aug 22, 2008, 5:29 PM)

carnut
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Aug 20, 2008, 5:15 PM

Post #9 of 10 (3438 views)
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Re: [Repair man] Toshiba TW40X81 convergence [In reply to]	Can't Post

A late follow up. Monday night I disconnected then reconnected every plug to the convergence board as well as the color guns to their respective boards. Plugged TV back in and everything is properly aligned!! 2 days now and no issues at all. So, loose connection? after sitting in one place 8 years then being moved by truck 40 miles. Thanks to everyone that guided me thru this.

Repair man
Enthusiast

Aug 22, 2008, 5:37 PM

Post #10 of 10 (3425 views)
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Re: [carnut] Toshiba TW40X81 convergence [In reply to]	Can't Post

Well, I'm happy to hear the good news and thanks for posting your fix for all to share! ... Loose connections will cause the exact same symptoms as bad solder joints & yes moving sets no matter how long they've sat (8 years or 8 hours) can cause connectors to work their way loose. This is happening a lot with much of the newer LCD and Plasma sets; some of them brand new right out of the box, I repair these types of problems weekly at my shop. -- Dan

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If you (or anyone reading this post) have any further questions or need clarification please feel free to contact me direct; you can find my email address by clicking on my user-name.

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