Question about Mitsubishi WS-55711 55" Rear Projection Television

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Blue convergence wont adjust

Ive replaced the ic chip but didnt fix the convergence issue. I read to check r8c2 and r8c22 and they are discolored, Do you know of a good place to purchase these and part #

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That is one of the yoke return resistors, it's 3.9 ohm 1 watt. Replace them with a 2 watt resistor of the same value.. Best place would be Acme out of Florida http://www.acme-sales.net/index.shtml bag of 10 for 1.99
plus shipping.
If R8c22 is bad its almost certain that R8c21 is bad also and that mean the blue was probably distorted... But check all the returns with an analog meter including R8c19, R8c20, R8c22, R8c23, R8c21, R8c24...
Bill

Posted on Jul 20, 2008

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I just replaced the 2 Convergence IC's now i have a bad pitcure


Yes, did you check the group of identical 3.9 ohm blue resistors in front of the chips? If even one is open or discolored in the middle convergence will not adjust in some area.

SD TECH

Feb 02, 2010 | Mitsubishi WS-65907 65" Rear Projection...

1 Answer

The picture was fine and now there seems to be a blue shadow


This for a Hitachi is a somewhat unusual model--if the convergence will not adjust (in your case blue) one of the two STK-392-120 CONVERGENCE IC'S is bad.

This is a fairly easy set to replace these on---I can tell you how if you know how to solder etc. Most of the time only the 2 chips need to be replaced and the set adjusted---sometimes there will be a burnt or discolored resistor near the chips that also needs to be replaced---total repair should take about 1 hour and you can buy the pair of chips on Ebay for less than 14 dollars plus shipping.

I am here to help people---if you have ANY questions or need advice reply to this posting here and I will help you.

Regards, SD TECH

Oct 03, 2009 | Hitachi 43FDX15B 43" Rear Projection...

2 Answers

Rear Projection Convergence Issue


what you have is a set that uses two STK-392-110 CONVERGENCE IC CHIPS; one is bad and both should be replaced--also look for a blue resistor or resistors around them marked 2.2 ohm(with an upside down u after the value printed on the resistors) the IC's are each located on a metal heat sink with fins---the blue resistors are in front of them--a discolored resistor will look whiteish in the middle---most times this can be fixed for a reasonable price in your home--you have a set with a light box--6 bolts and unplug a few cables and the whole thing comes out so you can get inside (after removal of the back cover) This repair is quite common and takes about an hour------I do a lot of them in my area--if this was helpful give me a vote and if you need any more assistance contact me: etower.766@netzero.net

Aug 13, 2009 | Panasonic PT-47WX49 47" Rear Projection...

1 Answer

PT-47WX53G wont turn on 3 blinking lights from the power area.


If the red power LED is blinking 3 times--it is most likely a shorted convergence IC---the only way you can be sure is to remove the light box--I can tell you how by email--and unsolder the two STK-392-110 ic chips----they are on two heat sinks made of aluminum next to each other; if you open the back cover and find them you will see about a dozen blue(light blue) resistors marked 2.2 ohm----if any of those are some what white in the middle(discolored) they are gone and the set will never adjust until you replace them and the two convergence IC chips---What I usually do in this case is remove the light box and unsolder both IC chips and plug it in and turn it on---if the set now comes on and stays on--I replace the IC chips and adjust the set---I have done hundreds of these sets---3 blinks is almost always a bad convergence IC--if this was helpful give me a vote---AND IF YOU NEED DIRECT ASSISTANCE contact me at:

etower.766@netzero.net

San Diego tech

Aug 13, 2009 | Panasonic PT-47WX49 47" Rear Projection...

1 Answer

Zenith R60v26 has burnt resistor at RK5 on convergence board


Hello, I have the exact same issue with my R49W36, I replaced the convergence chips but there are also two 1 ohm resistors with the same color pattern as yours that are bad. I have looked all over and cannot find a 1 ohm resistor anywhere. Where did you find it?

Dec 31, 2008 | Zenith R60V26 60" Rear Projection...

1 Answer

60PP9352 60 in. Rear - Blue convergence issue


Replacing only the ICs MAY solve the problem, however, many people have also had blown resistors requiring replacement. Also the convergence board should be checked for cracked solder. If you replace the ICs and the resistors are shot, the ICs may blow again almost immediately, meaning you may have to do the repair twice.
You do not have to replace any transistors to fix this convergence failure.

May 28, 2008 | Philips 60PP9352 60" Rear Projection...

1 Answer

Hitachi 53uwx10ba rear pro


Set needs convergence ic's changed (STK392-110). Also look for resistors slightly discolored around STKs, usually low value like 1.5 ohm, 2.7 and 3.3 If you have an ohm meter and a soldering iron, solder and solder wick, you can attempt this yourself. Remove rear cover of set. Mark and unplug connectors from convergence board, including small jumpers that interconnect boards. Remove board, turn over and unsolder pins of conv. ic's using solder wick. Unscrew mounting screws and pull chips out. Careful, white heatsink compound is messy. Apply new compound to new chips if needed, making sure not to bend small pins. Slide chips in and screw in mounting screws. Flip board and solder in ic's making sure all pins came through. Check for small resistors around ic's being discolored,(usually 1.5 ohm) These are critical and a few tenths of an ohm change will cause extra alignments needed. Replug and secure board. Double check that all connectors are in place and power up unit. If you changed any mechanical adjustments to tubes or lenses, change them back now and try auto convergence. Service adjustment procedures are avail. online if needed. Good luck!

Mar 01, 2008 | Hitachi 50UX57B 50" Rear Projection...

1 Answer

Convergence


Replace both convergence IC's part# STK392-040. Also check for burnt/discolored resistors nearby.

Aug 23, 2007 | Samsung HCL4715W 47" Rear Projection...

1 Answer

Samsung HDTV 1080i blue congernce/loud pop


One of the Convergence IC's most likely shorted and that is the pop you heard. Is best to replace both and check micro fuses supplying + & - dc voltage to the chips. Also check the resistors in front of the IC's as they discolor or burn & change value.

Jul 04, 2007 | Sony KP-53S65 53" Rear Projection...

6 Answers

Phillips 60PP920217F Convergence Problems


replace ic chips pt# stk392-120 or stk392- 150 and there are 12 resistors located near ic clips pt# 6r8 ( color code blue - gray - gold - gold ) board location no#s 3149 thu 3160 if you look close you may find two resistors discolored as i found on my convergence circut board , also use heat sink compound on new ic chips , take your time to mark all wire connectors going to board from tv , also use .022 dia gage rosin -core solder and a 15- 25 watt soldering iron you may have to adjust the red - blue convergence afterwards my tv set is 3 yrs old also ( thanks holbert )

May 03, 2007 | Philips 60PP9202 60" Rear Projection...

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