Question about Philips Magnavox 51MP392H Rear Projection Television
I have a magnavox 51MP392H rear projection television that I bought 4 years ago. And one day turned it on and the picture in curved at top and bottom, with ghosting. From what I have been able to find on the net and forums such as this I know it is the convergence chips. I plan on it fixing myself, I have some experience in electronics and at $300 to $400 to get it fixed, I'll do it.... So I know I need to order the 2 chips (STK392-120 Sanyo Ics) and replace R3159 and R3160 (6.8 ohm 1w) resistors. But I have also read that I may need to enter the service mode menu to make adjustment to the set. My question is then, how do I enter the service mode? I have searched the net and cannot find that little tidbit of info... Thankyou all for your help in getting me this far...
I had the same problem where all of a sudden it started bowing on top and bottom and the colors were bad. I read on here and other sites about the 2 convergance chips so I figured why not try as the tv was going to get thrown away because I could not find anyone that would touch it. Well I ordered 2 stk392-120's (I know others are saying use the 150's or 180's but I just wanted to put the same ones that were in there) I ordered them from electronix.com for 9.99 each plus 6.60 for shipping they took 3 days to get here and I installed them tonight and it worked great. The whole thing took only about 2 hours from start to finish. Here's a couple of tips....the chips are on the far left when looking at the tv from the back, make sure you mark with a marker where the wires go that you have to unplug as there are about 10 of them, each chip has 19 pins that you will have to soder make sure you have a soder ****** to get all the old soder up as you are heating them up, after you are done puting it back together leave the back cover off and turn it on, then go into your menu and go to pictureand go to manual converge and go to undo multpoint and restore factory as this will reset it all. Then if your color is still a little off as mine was there are 6 knobs in the back of the tv by the chips you were working on, find a channel with a lot of colors and try adjusting the top 3 a little at a time till you get the right color that you like. This should do it. It took 26 bucks and 2 hours for me to fix a tv I was ready to replace, thank god for the internet to be able to look stuff like this up. Good luck!
Posted on May 09, 2008
The STK392-120 replacement in my TV worked! I bought my replacement chips from http://electronix.com/ for $10 each. I'm hoping the chips won't burn out again. I believe the problem was caused because I built the TV into a wall without ventilation. Thank you kc0ace for this solution.
Posted on Apr 26, 2008
Here is a link for the service manual, it should help.
Posted on Jan 08, 2008
Well got the chips and installed them. didnt buy the cheap ones though. also bought the resistors because when i checked all of them there were two that were bad, just a note when ordering the resistors some companies have a minimum order of 10 dollars the resistors are about 1.99 each so i ordered 8 to meet the minimum. desoldering was a breeze with a little solder wick. took longer to find the parts than to install them. tv works like new. saved 350 dollars.
Posted on Nov 24, 2008
Hmmm, I'm wondering if this is a problem with a friends set? they are having Reds that come out as Orange and Green as Blue...ect... could this be color convergence?
Also I looked up those chips SKT392-120 I found them for $6.99 each at http://www.suburban-elect.com/display/STK392-120/STK392-120
I'm no techie so I was wondering if these were the same thing. I also lookin into that service manual there seems to be a lot of service adjustments to try. I'm debating on buying the junk beast from him and playing frankinstien.
Posted on Oct 31, 2008
Thanks so much. I bought the parts today, two stk392-120's. I will embark on the task when they get here. I am not a technical person, so wish me luck. Can anyone clue me in on how I am supposed to ground myself? I saw references to this and want to make sure I dont hurt anything else in the process. Also is there any specific type of solder I need to purchase. Thanks again.
Posted on Oct 30, 2008
The two resistors are not the only ones you need to change. there are 10 more to change eventually.just check them with an Ohmmeter. they should check at or around 3.4 Ohms.In general you don't need to go into servicemenu, although the code is only for technicians. do just the customer convergence and you should be good to go.Make sure, when installing the Chips you use heatsink compound to get a thermal connection to the heatsink.otherwise they (the IC's) will die on you in a heartbeat.Also make sure you get original Sanyo IC's not those conterfeit's that are everywhere offered.
Posted on Dec 26, 2007
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