Pulled the wires for the crts off. didn't label them correctly help
I was changing out the ic's (convergence problems)and i took all the connectors off, replaced the ic's and put it all back together. the last set of wires that i need to connect are the wires that connect to the green, blue, and red crts. dummby me, i labeled the board and the connectors,but not the wires. now i don't know which wires go to which connector. it is for the board that is labeled HD INPUT-AV-5 and HD INPUT-AV4. on the board itself the connectors are labeled 1720 1710 1700. they are all 3 pin connectors. is there any way to find out which connector goes to which gun (or crt board)?
here is where a picture of it is. labeled 1 2 3
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Re: pulled the wires for the crts off. didn't label them...
Yes the first one near the rear of the set goes to the blue crt which if you are looking in from rear will be on the far left and the middle will go to green in the middle and the 3rd or last will go to red on the right. A rule of thumb in this case is alway red on right and green is always middle crt.
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The tv pictures cloudy or hallow?Yes,than the R,G,B CRTS Tubes guns require changing it coolant liquid.Tries websites like Tvrepairworld.com,Tvrepairkits.com to buy a coolant kit to used.But just R,B,G colors lines mis alignment,colors shadows or 3D pictures,this problems is a convergence problems,it dead.The tv convergence board require changing the 2 STK convergence ICS and some or all it resistors to solved the convergence problems.The shop,will cost u $300-350 for parts and labors.
yes that is correct 12 is normal...make sure all connectors are plugged in and in the correct places . conectors should be marked with letters that match the marking on the circuit board. Then look for heaters , in the glass bottom of the picture tubes(CRTs) there should be a little orange glow visable though the neck of the CRTs just above where the crt boards plugg onto the bottom. if the heaters are not glowing then check your wires to the crt boards again , you probly tugged one of them too hard during disassembly also check for cracked solder in the heater circuit......Oh yeah, you didn't mention -Does the TV get high voltage ??? thats important to having a picture......If you see the heaters glowing when the tv is on then look down into the lenses of the crts . If you see a brite color horizontal line closer to one side in each of them then you know most of the tv is working. If that line is curved then the tv probly detects that the convergence circuit is not working and it is blanking video.
the error is 21 (see what number it ends the sequence with..) . Error 21 is X_Ray protect and you probly plugged one of the connectors into the diagnosic connector(near the high voltage transformer- normally nothing goes there) . If that is the case then somthing in the H.V. circuit could have been permanently damaged and now the tv has a new problem and wont work even if you put that connector in the right place.
replace both stk392-110 convergence ics.the crts could be weak if you have no brightness.if the picture is dim the crts are bad.but the movement of the convergence are bad stk392-110 ics.some models they are very difficult to
change.you may contact me at 972-579-0527 if you are in the dallas/ft.worth metroplex.
the convergence is out
usually on the crts like this you have to replace 2 convergence ICs
usually numbered STK392-110 or -120 or -150 or -180 or somthing similar.
Sometimes the resistors in the same circuit are also blown and need to be replaced. I don't know what these are labeled on this tv.
It is a pretty simple fix for someone who can use a soldering iron.
After replacing the chips a full manual covergence is needed.
Tube-type projection TVs have separate picture tubes (CRT) for red, green and blue. Convergence is the process of getting the images from the three CRTs to line up properly so you see the correct colors on the screen. The convergence output integrated circuits (ICs) are the electronic devices which make this happen.
When I originally removed the board with the convergence IC's I labeled all of the wiring harneses with number tape as I keep a multi number roll on hand as I am a radio broadcast engineer. However there was one set at the very back of the board behind a large heat sink I didn't label because that location was the only place they would fit. When replacing the board after replacing the IC's I missed that particular wiring harness as it didn't have numbers and I didn't see the harness laying among the other wiring. After removing the board to check my soldering work that's when I discovered the harness. I plugged that set in along with the rest, replaced the board, and after cleaning the CRTS's and the mirror the set worked good as new and a much sharper, cleaner picture. Thanks for the information on your forum as it always feels to repair something yourself and save a few hundred bucks to boot.
Go in and find the conv ICs, they will be mounted on a
big heatsink and the wires going to the conv yokes will
most likely plug in somewhere closeby.
Conv ICs are the workhorse of the CRT RPTV, and it is
not unusual at all for them to need to be changed out
at some time in the life of a CRT RPTV.
Comment by MrBob84, posted on Feb 04, 2008 PS - The wires for the conv yokes at the CRT necks are the
thin ones. The thicker ones are for the hor and vert
sweeps, which must never be disconnected from their
circuitry during CRT operation.
If your beam loses sweep on any of the CRTs, it will
instantly score/gouge your phosphors on your CRT faces,
vaporizing the phosphors there and ruining the CRTs.
The beam is very powerful, but in normal operation
moves incredibly fast, not damaging anything. Any
slowdown of the movement of the very powerful beam that
draws the picture, acts like the searing vaporizing beam in Tom Cruise's War of the Worlds.