Replaced ic's. set powers now. now the convergence is whacked.
Replaced the ic's in the set because there was no power. now i have power but the convergence is all out of whack. the red and blue are on line but the green is bowed like crazy. when i first turned the set on, one of the resistors was glowing red hot, but now it doesn't. do u think the resistor may have blown and needs replaced?
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Re: replaced ic's. set powers now. now the convergence is...
Sorry buddy , you already know the answer, see the other person that has the same problem , all info with schematic is there, make shure that you replace the resistor and check the vcc to the two ic's, for +/- about 25 vdc. If not there look for burt resistors or fuses.
These set's I just love them, the board can be replace there places were they rebuild them for you. But they charge to mutch. The origenal board was $185.00 not for rebuild board they or $360.00.
Once you think you have solve the problem go the page 46 and try adjusting the convergence, if you need more help email me
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you most likely need to replace the convergence ICs. If you are lucky, they may have unsoldered pin connections at the PCB, you can try re-soldering those loose pins. What usually happens is that because of the heat generated, the pins have become detached at the IC also, thus the need to replace the ICs. Some of these have either fuses or resistors to the ICs that have also opened & will need replaced also.
If you try to adjust convergence with the flash focus, perfect focus, (depending on the make of your set) or by manual convergence and the lines will not line up or even move. What you might be experiencing based on this symptom sounds like a convergence IC problem. Since green cannot be moved by the customer remote access, then you definitely have an IC problem. I have repaired hundreds of these sets, so if you have any questions after reading the following, please reply to this post and I will help you in any way thatI can. With any Projection Television that has a damaged convergence problem, you do not want to continue the use of the set. If the IC’s continue to fail they will cause a short in the power supply and cause your television to not power up, and possibly damage the CRT’s in the set. With that aside I have some support suggestions that I have put together that may help you make an informed decision.
You should be able to get a local service center to repair this at your house for between $350.00 - $450.00, If you want to repair this set yourself, I have some instructions below that will be a help to you. While it is not a very hard repair, this repair can be a bit tricky How do I tell if the IC’s are damaged? When looking at the area around the convergence IC’s you see some resistors that have changed colors, or you test a resistor and it no longer reads the marked value. You will have to replace the IC’s and the supporting components.
When you remove the old IC's, please be sure to remove all of the old heat sink compound, as it can act as an insulation for the new IC's and cause them to overheat. I usually clean the heat sinks with alcohol and a small rag.
Where are the IC’s located and how do I find them? There are two and large IC’s that control the convergence in a big screen set. Some of the newer sets only have one. If you only have one, it is right in the middle of the set on the center circuit board. They are secured to a very large aluminum heat sink. They will have a part number stamped on them that will start with an STKXXX-XXX, like STK392-110.
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.
I hope this information allows you to resolve this issue. I am doing this for free. If I have helped you, please help me, and rate this suggestion the highest FixYa rating. (Two Thumbs Up) Please Note: If you cannot rate this post with the highest rating, then please do not leave any rating. I am doing this for free and I do not think that any rating other that the best is needed. If you need further assistance please comment to this post and I will try to help you further. Thanks for using FixYa asnowman I have attached some photos of really bad convergence problems; your picture may not be exactly as bad as these.
I dont think you have problem with Red Gun.
One of your Convergence IC is faulty with 2 RK series Resisitor(Low Value) in Convergence
Amp Borad.If you changed IC look for RK series Resistor (may be 3.9ohm/2.7ohm)
Depending on where you bought the ICs you could have fried the new ICs when powering it up with burnt resistors as the green is controled by both ICs one IC controling the horizontal green Convergence and the other IC controling the vertical green convergence. Have you checked all the convergence resistors out of circuit?
Can you adjust the convergence by the convergence menu without going through the service menu? The settings through the convergence menu should save automatically. Have you replaced the convergence ICs? If so the settings should save, if not the D board will need to be replaced or at the very least rebuilt. Let me know if you need further assistance with this issue.
Most likely the convergence output IC has shorted out and has overloaded the convergence power supply, which has stopped working. The computer senses that the convergence power supply is not running and shuts the set down. The convergence IC should be replaced, the power supply restored and the convergence circuits realigned by someone experienced in Mitsubishi projection sets. When I do a housecall for a set like that I charge $150, but shops in your area will vary so ask around.