Motorola ts907 low hv

[timmy]

Originally Posted by Yamamaya42

the live pic looks crappy because the input video being fed to test point B is 4-5 times too low, the TV expects 5v PtP going into the 1st video amp, but w/o an amp to boost it, it is only getting 1v, and will have a washed out picture when fed direct video to that point no matter the brightness level setting.

And the reason the set is on it's side is that it has the access panel removed on the bottom to reach the underside easily for service with the chassis still installed.
It's prob petty much understood that once the set is upright and in it's final location, a final purity and convergence will need to be done again, as is always with these sets.

Yes that’s right about how the pic looks and the set is on all 4 legs. Overall the pic looks good considering all these problems with this set colors look better then previous pics.

[Yamamaya42]

This is what got color working on my CTC-16XL, however, my set is quite a different situation than yours and there is absolutely no guarantee that this will help you at all, but it can't make it worse like trying to mess with the IF transformers, try adjusting the 4.5 mhz trap, A13, this in the only one done visually, get a decent BW video, contrast at max, turn up color to where you see the herringbone pattern, and then tune 4.5 mhz trap, A13 to see if it makes any changes at all, if it does not put it back, mine was WAY off and I had to adjust it many turns, but this may not be the same for you.

[timmy]

Originally Posted by Yamamaya42

This is what got color working on my CTC-16XL, however, my set is quite a different situation than yours and there is absolutely no guarantee that this will help you at all, but it can't make it worse like trying to mess with the IF transformers, try adjusting the 4.5 mhz trap, A13, this in the only one done visually, get a decent BW video, contrast at max, turn up color to where you see the herringbone pattern, and then tune 4.5 mhz trap, A13 to see if it makes any changes at all, if it does not put it back, mine was WAY off and I had to adjust it many turns, but this may not be the same for you.

There’s no trap at a13 are you talking about a3 that’s where the 47.25 trap is I haven’t touched that one afraid it’s going to do what the other trap did but when I stand it up again I’ll try that.

[Yamamaya42]

Originally Posted by timmy

There’s no trap at a13 are you talking about a3 that’s where the 47.25 trap is I haven’t touched that one afraid it’s going to do what the other trap did but when I stand it up again I’ll try that.

a13/L7 step 5 in the alignment setup.

[timmy]

As for snow the screen is all white and has the normal snow and the sound has snow as well changing the channel changes the snow alittle.

[timmy]

Ok I found it that’s next to the 41.25 trap that was open is this what your saying to adjust the trap or A13

[Yamamaya42]

location can be found on page 6 of SAMS, and shown on schematic page 3 after video det right below C32.

[timmy]

Yes I know which one it is A13 I know where it is and as for the trap next to A13 that was open I put the knob pretty much where is was befor. But for now I was using wood Allen keys which are no good they strip and don’t work I’m waiting for nylon ones to come in the mail.

[timmy]

As for the thermistor I’m putting a permanent jumper in because the voltage was to low for to long when turned on and the pilot tuner lamp was very dim and the thermistor was new.my other Motorola I had was jumped as well and was fine.

[Yamamaya42]

Originally Posted by timmy

As for the thermistor I’m putting a permanent jumper in because the voltage was to low for to long when turned on and the pilot tuner lamp was very dim and the thermistor was new.my other Motorola I had was jumped as well and was fine.

you may want to think about getting this as a replacement.

https://www.moyerelectronics.com/BVM...8-29822298d228

same thermistor used in the CTC-11, same location, should work the same way.

[timmy]

The voltage dropped so far I don’t even trust these thermistors because the voltage drops so bad the horizontal oscillator won’t run so my other moto had the thermistor jumped and I since put new nte diodes in 1 kv 2 amp

[Yamamaya42]

thermistors do wear out over time, it's inevitable since they take such a beating, but the exact replacement is hard to find :/
https://talonelectronics.com/shop/item.aspx?itemid=3293

EDIT
====

here is an NOS RCA version of the exact part in your set.
https://www.ebay.com/itm/144666189041

[timmy]

Originally Posted by Yamamaya42

thermistors do wear out over time, it's inevitable since they take such a beating, but the exact replacement is hard to find :/
https://talonelectronics.com/shop/item.aspx?itemid=3293

I already put the exact replacement in it’s new and I got it from moyers it should have lasted longer then this it’s already bad and never got to set down in front of the set to watch howdy doody.

[timmy]

Unrelated on a pilot tv37 there was b+ problems not being up to normal is there one diode or 2 used under the 25z6 3-4 5-8 ok so I didn’t have the schematic in front of me it’s only one diode.

[Yamamaya42]

Originally Posted by timmy

Unrelated on a pilot tv37 there was b+ problems not being up to normal is there one diode or 2 used under the 25z6 3-4 5-8 ok so I didn’t have the schematic in front of me it’s only one diode.

that's a weird TV, with a tiny screen
https://www.earlytelevision.org/pdf/...sams_62-16.pdf