Question about Toshiba 53H71 53 in. Rear Projection Television
I am a TV tech and have had experience with this type of problem on many sets...So Far the only trouble is the 2 output ic's stk392-110 which should be replaced with the upgrade stk392-180..All three Color Amps are within these ic's for both horizontal and vertical convergence. Sometimes a resistor or two will burn out as well because of the short in these ic's. Be sure to be extrremely careful unsoldering and soldering and use good heat sink compound and fasten securely to the heatsink metal. Manual convergence calibration may be necessary after the ic's are replaced. First try Touch Focus after the ic's have been Properly replaced. This repair should be done by competent personnel and takes about 3 hours because of dis-assembly and re-assembly time. I am writing this because i have seen on this site mis-leading info. i come to these sites myself to verify part numbers and to see if there have been additional complications such as complete shut-down.
Posted on Jan 06, 2007
You may have a convergence problem. Here are some of the most common symptoms.
Using your original remote go-to the tv settings then goto the convergence section.
Try to adjust the red and then the blue convergence.
You should be able to move them up, down, left, and right.
If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.
You need to replace the convergence chips and convergence resistors. Check the site www.TvRepairKits.com. They have put together a kits for most models. If you don't see a kit for your set send them a quick email and they will put one together for you. Their kits includes photo instruction guides, original Sanyo STK chips, convergence resistors, pico fuses, etc.
Posted on Feb 05, 2009
I had a problem with my TV colors not lining up. One day I turned it on and the green was out of wack. I checked this message board and replaced the STK chips, bad soldering and all led to me just giving up on that and buying a whole new Convergence Board ($185). I replaced the missing silver box on the new board and I just plugged this in and though now my Green lines up okay, my red is out of whack. Is there something I am doing wrong? Can anyone help me? Did i miss a step? Frustrated......Bruce
Posted on Aug 18, 2007
Had the same problem. Was ic's
Posted on Mar 09, 2007
Common problem with a lot of these Toshibas, TN61X81, 50HX70, 53H71, etc. The problem is bad eproms on the digital convergence board. They lose their memory and convergence goes out. You can enter the service menu and manually adjust all three colors back into linearity but chances are it will go out again. It can take upwards of 4-8 hours to manually adjust. Per Toshiba the digital convergence board part number 23706371 (PB6340B) is no longer available, although if you contact Toshiba they may direct you to the part somewhere else? Good luck.
Posted on Nov 14, 2006
There are no convergence adjustments for LCD based TVs. The optical engine may well be defective. You need to call for service.
Posted on Nov 12, 2006
The description of the symptom is a good one,that is what a set with a convergence problem looks like,the repair man might suggest you change all 3 colors amps ,then He will have to adjust it with the service manual.
Posted on Sep 14, 2006
Contact these guys on convergence issues, they are outstanding and they will walk you through the process ,,,they saved me thousands....
Posted on Mar 22, 2009
I have a samsung rear projection it was working fine then i turned it on one day and the colours where out of sink.on mine it was the green that seemed to be out at the top left to centre of screen.after 2 weeks of seeking some one to fix it with i decided to have a look my self.in the bottom panal there is a small board about 3"x2" with 4 conectors on it with 3 wires comming from each conecter.above each conector there r the letter r,g,b and neu.i disconected the green conecter(with power off),then powered up tv there was no picture on screen at this point but you could here the tv power up.i then turn off power and put connecter back on(there was a small spark as i reconnected it)i turned tv back on and picture was fine for an hour .i done the same again and so far so good the pic seems to be holding up fine.seems as if it was not earthing properly.hope this helps any 1 with similar problem.
Posted on Nov 25, 2006
This unit does not use convergence IC. More troubelshooting is required. The problem could be the AMP board, but could also be the small signal board where the settings are stored. If the technician is a reputable one, then he is probably correct on the amp board.
Posted on Oct 08, 2006
Convergence amp brings all the colors together. It could very well be that. Makes sense. Have him explain it to you and have him change it out. To converge is to bring something all together. You colors are not all together.
Posted on Sep 24, 2006
MAKE SURE YOU REMOVE ALL SPEAKERS AROUND YOUR TV!! THE MAGNETS IN YOUR SPEAKERS CAN CREATE SERIOUS PROBLEMS FOR YOUR TV. LOU
Posted on Sep 22, 2009
The best fixit I have found for these kind of problems when all else seems overwhelming is simply to just take out the old bat and beat the **** out of it. it didnt work anyway and you feel better about it.
Posted on Sep 23, 2008
Same problem with convergence. Solution: 1) Changed 2 STK392-110 and replace 1 resister 1.1 ohm 2W. 2) manual adjustment with romote controller. (in the main menu)
TV back to work this weekend!!!
Posted on Aug 12, 2008
No, its likly a COMMON "IC" short
What has happened to your tv:
What has normally happened is that the convergence output driver ic's either one or both of them has shorted. Causing your picture to be un-converged, The Symptom of your failure can take on many different looks, so one explanation of what the failure looks like will not be adequate. It will be basically one or more (red,Green,Blue) crt's are not aligned correctly, and colored shifted, and distorted picture of some kind will be seen. Auto focus will not fixit and may even make it worse. When these ic's short, they can cause one or more pico fuse to blow. Allot of people ignore this part of the repair and get themselves into trouble. Please listen to my warning, and make sure you check these fuses!
FOR A MORE DETAILED DESCRIPTION GO TO: http://www.techlore.com/blog/entry/19694/Sony-Convergence-Repair-My-Sony-TV-has-a-distorted-picture-/
Posted on May 15, 2008
Try www.ptscorp.com . they can rebuild the board. its around $100. i think there are 4 screws in your front cover, just give it another look. the convergence board is in the front, it has 2 stk392-110 chips on it. i hope this helps.
Posted on Dec 17, 2007
DLP or LCD Projection TV's (E44W46LCD) typically don't have convergence amps. Those are used in RPTV's which use three different CRT's. They "line up" or converge the three different pictures to project at the same spot on the front screen. Sounds like either Digital Board, Color Wheel, or Light Engine.
Posted on Oct 23, 2006
Have you also tried checking the convergence Memory? Often Bad/Corrupted memory IC is the Culprit.
Posted on Oct 07, 2006
Remove front speaker grill. Remove panel held on by a few screwsand u will see 6 knobs that control the voltage to each of the 3 primary powers labled r g b . asecond set that controls the focous 4 each of the colors, dont mess w these. turn down the red green or blue by spinnining it to the left. a little goes a long way
Posted on Aug 19, 2009
SOURCE: convergence problem???
Check the resistors by the STK ic's, should be 2.2 ohms. Under the heat sink, also check the 1.8 Ohm 1W, fusible resistors found around the area as well.
Posted on Feb 05, 2008
SOURCE: convergence problem???
there is a way of lining the colours up in the service menu. to get into the service menu pres the "mute" button and then hold down the "mute" and "menu" button and the same time. this has to be done quickly. you then navigate to a screen which will have black square's on it. you will see the colurs that need to be lined up. it the colours wont line up. you will have to replace the convergience IC's. hope this helps you
Posted on Aug 05, 2008
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