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#181
08-07-2023, 04:55 PM
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Hi Guys..... You guys are going the wrong way..... You know the voltage on Pin 9 of V21
is measured correctly is way off.... That grid is biased so high as to capture the burst signal, and it's way off..... If you guys did the AFC alignment as in the sams, and you finish with rainbow bars, then it's time to stop. And if you got the peak deflection (which as Timmy says is the highest voltage, then you are done there for now). V21 - Pin 3 Voltage is low - Why? Check C118, disconnect one side & see if voltage goes up, you don't have to replace it. Check everything that leads to Pin 9 of V21, Backtrack through stuff that goes to that pin..... Something going on there..... I believe at this point you guys have a running Color Osc. and as long as you have the cool rainbow stuff on the screen it's working, time to go someplace else.... I think the burst signal is being blocked from reaching the Osc. & properly syncing it. So you have to go back. A while ago Timmy said the top & bottom of the screen was black, or dark, That's also a clue - not the color osc. What are the voltages on V4 Pin 3, 2 & 1? What are the voltages V19 Pin 1, 9, & 8? Whenever you have problems, Always make your first step voltage checks..... ..
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Yes you can call me "Squirrel boy" 
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#182
08-07-2023, 05:06 PM
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#183
08-07-2023, 05:21 PM
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On V19 the difference in voltages on pins 6 & 3 is really pretty big considering there
is a low ohm coil between those two pins...... Timmy are your readings correct? Is that Primary winding of L29 Pins 1 & 3 ok? I don't think there should be such a large difference in Voltage unless possibly that primary is open... Just test it don't replace it, be sure solder connections look good no corrosion, cold joints..... Is it around 9 ohms...? .
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Yes you can call me "Squirrel boy"
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#184
08-07-2023, 05:36 PM
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The voltages for v19 I had posted under the other voltages they were 1 95.6 9 -40.7 8 5.86 I had noticed v4 got extremely hot very quickly while the others were still somewhat cool.
Last edited by timmy; 08-07-2023 at 05:52 PM.
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#185
08-07-2023, 06:21 PM
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nul
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=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために Last edited by Yamamaya42; 08-07-2023 at 06:32 PM.
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#186
08-07-2023, 06:39 PM
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I don't think this is a worry - The Video Amplifier half of V4 has a bit of power running through it, I don't think it's a problem.... See the size of the plate resistor - and it's 4W..... ..
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Yes you can call me "Squirrel boy"
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#188
08-07-2023, 07:26 PM
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whats the voltage on pin 9 V19? -40.7? also too low
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=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#189
08-07-2023, 07:38 PM
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All the voltages are on the previous page and unfortunately I don’t have another 6gh8 or even a sub with a different number Something is definitely going on here with this set I didn’t loose the color from doing anything it just crapped out
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#190
08-07-2023, 07:47 PM
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All of this points to one thing, is related TO one place, the pulse winding on the flyback, pins 13-14, this goes to the Burst gate, horz blanking, color killer, and others, first two you listed having very low than normal voltage readings, will be tricky to find the cause
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#191
08-07-2023, 07:49 PM
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I suspect you will find that the -10 on pin V4 is also low.
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=^-^= Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte. いとおしい人のために
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#192
08-07-2023, 07:54 PM
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Quote:
Actually... -40V is too high, higher than -75V as -40V is closer to 0V than -75V... With these bias voltages & if you look at the signal from the scope trace the tube is conducting just on the very tips of the signal - sending that part of the signal on to do just that item's job. ..
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Yes you can call me "Squirrel boy"
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#193
08-07-2023, 07:58 PM
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but not willing to ask because I think Timmy has enough to do right now.... I'm still having visions of this tv on fire out back in the grass field..... ..
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Yes you can call me "Squirrel boy"
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#194
08-07-2023, 08:04 PM
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I'm also hoping that the color killer knob is set so that it lets the color run even if it's a B&W show, or makes color snow when there is nothing connected to the tuner. Even if in this state, it will not produce color snow, when we figure out what it is, I want to know that the color will come on, and it's not blocked again by the color killer.... But then again, you guys have the Osc. running ok, so maybe forget this comment for now..... .
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Yes you can call me "Squirrel boy" Last edited by Username1; 08-07-2023 at 08:15 PM.
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#195
08-08-2023, 07:30 AM
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Ok so color killer is up for color boost voltages are 640v measures 634v 770v measures 800v and the voltage coming from the flyback 13-14 at c134 814v I’ll post the other voltages from v21 and v4
Ok v4 3 1.71v and flashing 2 .580v 1 26v V19 1 95v 9 -40v 8 5.88v L29 primary 9.1 ohms Last edited by timmy; 08-08-2023 at 09:15 AM.
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Linear Mode
