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#3
10-10-2022, 08:45 PM
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well, until you find someone with an oscilloscope, or are able to get one, you are quite limited.
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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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#4
10-11-2022, 07:19 AM
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Username1 mentions that the horizontal oscillator of course is not running correctly and that it don’t seem to have the punch behind the oscillations which makes sense so if there are no resistors bad and voltages are present then the only thing left is caps oscillator coil which checks out fine and flyback the hots were changed as well. Right now I don’t have a scope so I’ll need to push on without it for the moment. And of course if the flyback is good caps make the proper speed and shape of the signal.
Last edited by timmy; 10-11-2022 at 07:32 AM.
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#6
10-11-2022, 10:51 AM
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Well I’m not one to give up but it’s altogether and still low hv pulling the 145 190 275 voltages down is it possible there is a problem in the panel that has the g1 control and the red green blue controls. I’m not finding any reason for this voltage to drop and I believe this is affecting the horizontal drive low voltage low or no horizontal drive. It needs 190v and 275v and they drop to far to support the oscillator.
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#7
10-11-2022, 12:24 PM
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What is a good low esr power supply cap 450v 100uf I have 2 sprague caps in the series circuit and that voltage stays up 385-390v but the other caps that supply 145 190 275 have got to be bad even though my cap checker shows good but in circuit they may be breaking down.
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#8
10-11-2022, 01:04 PM
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If you have replaced them already, you have virtually nothing to gain by replacing them again at this point, the problem is someplace else.
C3A, C2B, C3B, C2C, https://www.mouser.com/ProductDetail...nVkrybSw%3D%3D https://www.mouser.com/ProductDetail...j1prphYw%3D%3D https://www.mouser.com/ProductDetail...K8MOO7xA%3D%3D prob replacements. “low esr” caps are really not the right kind for this area, and hard to find in the values needed, General Purpose Electrolytic Capacitors will do just fine here.
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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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#9
10-11-2022, 01:21 PM
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Quote:
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#10
10-11-2022, 01:43 PM
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Quote:
https://www.avnet.com/wps/portal/aba...ic-capacitors/ Where it comes into play is higher frequency buck converter type power supplies, but in vintage stuff like this, it would really not help much at all at 60hz line inputs.
__________________
=^-^= 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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#12
10-11-2022, 03:08 PM
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Ok I was not waiting the 15 mins that they recommended because of the thermistor so in running it the 145 was 146 the 190 was 183 the 275 was 269 very close but here’s the kicker I pull the 6bk4 cap off no difference at all and I shut it down then after about a minute turned it back on and the voltages started dropping fast then all of a sudden they instantly jumped up To a good level again. It’s like a momentary short then it was gone. When they drop b+ stays good.
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#13
10-11-2022, 03:35 PM
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Ok, So there is still a problem with power supply voltages going up & Down...
Possible short, possible tube using too much current. Problem, current meter does not measure above some unusable value.... Timmy you can make your current meter measure more current, but you gotta make an adapter for it.... First, in the uploaded pic. Fig. 1 Just FYI this is the only way to measure DC Current in any circuit. You have to cut the Current Path and insert the Current Meter into the path. Second, This is kinda experimental, Since you have 2 meters, you can select one meter you want to use as your current meter for this tv. It needs to be able to measure about 700ma max. Fig. 2 shows the start of my experiment, Take your current meter - set it to the current DC Scale you will be using, It needs to be the MAX Current, I believe it was pretty low. If there is more than one DC Current scale, be aware you will not be able to switch scales with this little mod... Measure the resistance of the Amp-Meter set to the Current Scale you want to use. Find this resistance, I believe it will be around 5 - 12 Ohms maybe less.... Find another resistor in your stash 1W or so, that is the same value. Put that resistor across your current meter leads as in my Fig. 3 pic. This will DOUBLE the range of your current meter in it's present scale, HOWEVER, your meter will ACTUALLY be reading ONE HALF of the current passing through it.... Remember Current in Parallel Resistors Divides according to resistance..... So For Example, if your meter reads 10 Ohms, putting a 10 Ohm resistor across the probes will give the measured current 2 Paths One through the meter, and the other through the added resistor..... Find the equation online to Add Multipliers to the meter's ability.... How? 5 Ohms in parallel with the current meter will 3X I Believe the meters range... Once you build this circuit you will have to test it with known test circuit so you know it's giving you somewhat accurate readings..... Then, you can monitor current paths in this TV that may be using too much Fossil Fuel generated electricity when you turn it off & back on and have all those low voltage problems.... Hurry though, this blasted thread is approaching 50 pages..... Good Luck.... .
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Yes you can call me "Squirrel boy" Last edited by Username1; 10-11-2022 at 03:40 PM.
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#14
10-11-2022, 04:15 PM
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Quote:
 this one, to be exact https://www.amazon.com/Etekcity-Digi.../dp/B09K7P86N7
__________________
=^-^= 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; 10-11-2022 at 04:18 PM.
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#15
10-11-2022, 03:59 PM
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The voltages when turned on drop instantly no time for a tube to conduct then it just spiked up voltages went right up almost to say a switch was switched from short to no short I still think this may be a ceramic disc to ground or otherwise.
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