Question about Toshiba 55H70 55" Rear Projection Television
Also pulled pb3366-2 and pb3366-1 / can see the ic's on pb3366-2 have been replaced. one of the 1 amp fuses are blown.upon fuse replacement ,the picture flashes as a horizonal colapse,but not completely. I disconected the new fuse until I have an ideal what to do .the chips with the big heat sinks are cold.stk392-020's
SOURCE: Location of the STK392-110
The convergence IC's are large 2x3 inch(about) black in color IC's that stand up against a metal heatsink on the main printed circuit board. They will have white lettering on them that will plain as day when you see them. Make sure you replace these IC's with the manufacturers replacements and not some cheap copy, if the IC's cost less the 15 bucks a pop, they are cheap subs. Also do not forget the heatsink compound on the back of the new replacement IC's before you reinstall them. Good Luck
Posted on Mar 20, 2007
STK392-150 can be replacement for 110's no other resister values need to be changed, however be sure bad resisters are replaced and check all the resisters (6) have been taken out of circuit and checked. also check for solder cracks and cold solder joints.
Posted on Dec 02, 2007
If you are removing a defective chip, can you just cut the pins carefully with a wire cutter and later apply heat to pull them off?
Posted on Jan 29, 2008
SOURCE: 42H83 Convergence
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.
Posted on Aug 10, 2008
Along with the convergence IC’s there will also be some associated components that will need to be replaced as well. There are some resistors that are part of the convergence circuit that will be open and need to be replaced. Most likely these will appear charred in the center. If you have an Ohm Meter or a DVM, check all the resistors that are close to the IC’s and you should be looking for either ones that have opened or have changed values.
If one of the convergence IC’s are found to be bad, I would replace them both, if one has gone bad the other may go soon. I usually order my parts from Andrews Electronics in California, they will have the OEM components that you will need.
Their site is http://www.andrewselectronics.com/welcome.aspx
And their phone number is a 24-Hour Order Desk: (800) 274-4666
I recommend the phone order so you can talk to the person about the different types of IC’s that are available.
I would also advise that the convergence IC’s be OEM or better, just because they are cheap does not mean that they are a good deal. I have seen the cheap IC’s fail after a short time, even though they look exactly like the OEM IC’s. I think that the bottom line is that you will get what you pay for when it comes to the parts.
You can also try http://www.tvrepairkits.com/ , they do carry OEM or better parts.
I hope this information allows you to resolve this issue.
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Posted on Jan 30, 2010
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