Question about Projection Televisions
My 10 year old Sears LXI Slimview has recently started displaying horizontal distortion in the image on both the cable coax input channels and the VCR/DVD input (Yellow/Red/Whiite cables). When accessing the menus, the distortion is not there. There is a slight "jump" up & down on the image (approx 2") every few seconds that you can see in the menus, but no side to side distortion like in the channels. On the cable channels and the VCR/DVD, the left edge of the picture is ragged (offset 2" in some places) and the crresponding lines are shifted all the way across the screen. I took the back off and tightened up the coax where it goes through the back. I checked the connections and fuses and could not see any visible damage or loose solder joints. I did not examine the lamp connections. I noticed all the little adjustment knobs for the lamps and some more that I don't recognize. (I fix computers for a living, not TVs!!) Any ideas on the trouble and the fix for this problem?
Sears Roebuck model 626.54638 392 Chassis PTV515-AH01. (I think this is a Philips/Magnavox chassis) I do not have a schematic. Thanks for any suggestions!
SOURCE: convergence picture adjustment?
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
If you have remote control for the channels on your set, try to push menu then choose "memorize channel" or choose "cable" then do the channel memory.
Posted on Aug 16, 2009
Have convergence IC's replaced. I believe this unit uses STK-392-570 convergence IC's Only one has gone bad but replace them both, because if one has failed then the other is not far behind, for Blue and Green. One handles Red, One handles BLUE and Grn. There are only two of them in the set, They are the two largest IC's in the entire set.
Posted on Oct 01, 2009
These are both CRT type TV's(3 picture tubes drive the image) with different screen sizes and the CRT's are not interchangeable
Posted on Oct 24, 2009
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I repaired 3 sets and found many surface-mount caps were bad on four boards. After using an ESR meter and finding so many bad caps, I ended up replacing most of them (about 100). The parts were cheap, but it took me about 10-12 hours to repair. I've seen so-called capacitor repair kits on the web that only address the large caps on the power board. You can buy these individual caps at Mouser.com for under $10.00. Luckily people toss these sets so I have 3 awesome sets that only cost me labor and about $30.00. Sorry for the bad news about the caps.
Posted on Apr 21, 2010
These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.
When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer, Hitachi,Mitsubishi,Zenith and others.
You can get more information and a DIY convergenece repair kit with instructions from the link below.
Here are some of the most common problems with these sets...
Problem #1) Convergence
Yours may have one or more of the following symptoms...
*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound
Problem #2 - Another common problem is dull or washed out video.
Your set may have one or more of the following symptoms....
*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture
You can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull
Posted on Apr 22, 2010
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