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Re: blue convergence wont adjust
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
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...
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After the IC replacement, convergence adjustments should be done. If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ Details of this adjustments are given.
replace the 2 convergence STK IC BEFORE replacing the IC make sure that all the pico resistor are not open check the resistance with an multimeter replace any open reading resistor.replace also all bulging capacitors on the convergence section...good luck let me hear how it goes.
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.
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:
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.
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!
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.
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 )