Green Convergence Problem... Is it Convergence adjustment or replace STK392-110 ICs
I just picked up a 43FDX10B from a friend who said it was "broken".
I've fired it up and found that the green is significantly bowed downwards at the top of the screen (and very slightly at the bottom.)
Red and Blue are fine (though Red is tending towards purple, but that may be a separate issue)
I've tried the manual convergence change found here: http://www.orangesoftware.net/articles/hitachi.html
Do I want to start messing with pots on the green, or do I want to replace the STK ICs? And if so... it looks like I need to take the entire "mother"board out of the unit, true?
That looks to be fairly difficult... can anyone describe how to do it?
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Re: Green Convergence Problem... Is it Convergence...
You really need solid state elctronic experience to work on a printed circuit board unless you want to take a chance an bugger it up. Yes its the STK IC's and Yes you have to take the board out and unsolder the IC, install new ones and make sure you put enough heat sink compond on the heat sink, and then resolder them and then check the fusable resisitors and then fire it up and do a professional alighnmentt using a NTSC grade cross hatch generator. Its best if you seek out a pro to assist you in this repair.
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The problem with the unit is convergence.Remove convergence output board then replace IC2701 and IC2702 both of them are STK-392-120,After replacing ics you have to go into the menu of unit to adjust convergence.Align the red ontop the green then blue ontop the green.
there are two ics trhat control the three colors alignments. Its always recomended to replace both Convergence ICs at the same time when doing the repair as they both share the green color between the two ICs.
Thats the classisc sign that you need to replace both convergence ICs. You will need two Convergence ICs STK392-120 and then six resistors they are RK42 3.3 ohm 1watt, RK46 1.5 ohm 1watt, RK50 2.7 ohm 1watt, RK54 1.5 ohm 1watt, RK58 3.9 ohm 1watt, RK62 1.8 ohm 1watt. You can get replacement ICs and resistors at the following link and they provide free instalation instructions with pictures so you can repair the set yourself. Heres the link. http://servicemanuals.vstore.ca/
If the convergence adjustment is not moving the beam chances are the convergence IC(s) are defective. If you know how to solder and understand TV safety you may be able to fix it. With power disconnected remove the back. You should see two large heat sinks with large ICs (3 by 6 inches) with about 30 leads going through the circuit board. Numbers on the ICs should usually be something like STKxxx-xxx or some variation with x being a number. These ICs control the position of the three beams. If they go bad you can't adjust one or more beams. Replace them both as you don't want to get in there again in 3 months. Cost is not that much. http://www.tritronicsinc.com or http://www.partstore.com should have them at a reasonable price. Before replaceing the ICs look at the circuit board closly for cracked solder joints. Resoldering any bad joints might just solve your problems and avoid replacing the ICs. Good luck and remember safety.