Can anyone give me some advice on convergence amp upgrades. My rear projection t.v. currently has STK392-110 ic's, but I bought a set of STK392-140 ic's (Sellers mistake) I was going to send them back for the right one's, but can I use the STK392-140 ic's in my machine? Thanks to all in advance.
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Re: Toshiba 40pw13p projector ic query
NO - - clearly not 140's.... You can upgrade Q751 & Q752 to 150's or 180's which merely have higher amp ratings and thus more reliable.
Also, make really sure that the "seller" you got these from isn't selling you chineese knock offs. They are common in this industry and they may not last ten minutes in your Tv. I suggest some place like ACME out of Florida http://www.acme-sales.net
where you will be assured of getting Sanyo original Ic's and not some chineese look-a-like.
Also, make sure to test the 3.3 ohm return and low ohm feed resistors in the convergence circuit when you replace the amps. You may find one or more resistors in the return changed in value or open so I would suggest buying a package of those also (10 in a pack).
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Yes the convergence ICs need to be replaced, however so dont the six 1.8 ohm 1watt resistors as Toshiba recomends replacing those six resistors when the ICs are changed. You can get the 50H71 / 50H82 Convergence repair kit as the 42H83 is identical to the 50H71 series, so the kit will work for your model. Heres the link where you can get the kit. http://servicemanuals.vstore.ca/
I you give me your complete STK number such as STK392-010 as an example I can tell you what you can upgrade to also it does not require any resistor change when you upgrade but send me your complete IC number that you have and I can tell you what to upgrade to thank you
Convergence amps require B+ voltage to run them...they originate in the power supply and are fuse protected......then
they are fed to current limiting resistors near the IC's....
These devices must be checked......But,the #1 problem is use
of less than first quality IC's......STK392-110's,-120 and-150 can
be upgraded to STK394-160E made by Sanyo.....I use Hitachi
part # CZ 01341 or save money = buy kit with two IC's and some resistors part # X 480293...........read any of my convergence
Convergence amp ic bad http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html http://www.hdtvoice.com/voice/showthread.php?t=28929 Or send to ptscorp.com http://www.hdtvoice.com/voice/index.php?s= STK392-110 replace with STK394-160
STK392-120 Hitachi replaces these with STK394-160, for other sets it may not be a good sub. They have been fine in the Philips sets so far.
STK392-150 replace with STK394-160
***The 394 series replaced the 392 series and is cooler running. The subs listed here are the ones that I know to work in most sets.
The Toshiba 55H70 is a standard rear projection set. It does not have a "lamp", it has 3 picture tubes. When the colors suddenly do not line up on the screen, it means that one of your convergence output IC's has burned out and needs to be replaced. This is very common on those sets. If your set is using the STK392-110 IC's, it is probably a good idea to go ahead and replace both IC's with the newer upgraded STK392-150 IC's. The IC's should be replaced and the convergence circuits realigned by a qualified tech familiar with Toshiba projection sets.
There are 2 large IC's in your set and one of them has burned out. These are called convergence output IC's and are usually the STK392-010's. A good idea would be to go ahead and replace both with the newer, upgraded STK392-150 IC's. A good tech can change those IC's in about an hour and a half, and when I do a housecall for a set like that I charge $150, but shops in your area will vary so be sure to ask around.
Yes, it could be from the convergence amp having a loose connection. Big Screen tv's have problems with loose connection especially when moved or bumped. If you can take back off and find convergence amps then safely tap on ic's and see if it changes picture then it's maybe just aloose conn. If no change then you need to check resistors inline to red. At the most replace IC's these are the large STK's by a heatsink. Hope this helps!
Also,check micro fuses F851,F852,etc.
and with a good digital meter, check resistors feeding B+ to
I have been using Stk392-110T made by Toshiba with no re-calls.Hitachi also has an upgrade IC.
And be sure to check your soldering of IC pins--good connect,
with no short.....T.