The PCB layout also allows for larger oscillators - like this one
https://www.ebay.com/itm/256258430278?

That is a consideration thank you, hoping someone may have some other suggestions as well.

Well, first you have to be sure the oscillator is defective.
Then try to double check the VCC.

Regarding the electronic components purchasing, we don't consider ebay, amazon etc... normally I contact the original factory or the agents. For small order, I prefer mouser, rsonline, digikey and element14. Mouser would be my first choise btw.

majestyk wrote on 2024-05-28, 04:16:

The PCB layout also allows for larger oscillators - like this one
https://www.ebay.com/itm/256258430278?

This will not do, as it is a bare oscillator with fixed frequency. What is needed is a VCO because there's need to tune the oscillation frequency. VCO aspect comes into play to align things with whatever the incoming reference is.

https://www.mouser.com/c/passive-components/f … cy=28.636%20MHz

And those are also just oscillators without way to tune the freq. I looked a bit in mouser and they don't carry anything suitable for this purpose, not the correct freq nor anything in stock.

Huh?
The original is 28.636mhz.
The link is filtered by 28.636mhz.

Why are you on about tuning? It's a simple case of finding the correct formfactor and swapping it.

Look at the schematic posted, the part is a VCO and not a regular oscillator. The freq tuning input is absolutely in use there and the device is most probably not going to work properly without that ability.

Looks like it only chooses between pal and ntsc so wouldn't it make sense that they just dropped in a fixed oscillator like in the original image depending on the market?

Ie the variable is just"which market is this for? "

Okay, to answer the first one
There is a specific mhz crystal installed for the region, in my case I have NTSC-U 28.6.
The voltage control is used by the camera to skew the clock to synchronize it to gen-lock and correct other skew. Not to select the frequency.
As for the second, I confirmed it's defective because if I give it a gentle tap it starts working for a few minutes. Also checked the solder job.

Cool. See link to mouser above.
Find formfactor.
Get part no.
Find suitable supplier (if mouser doesn't deliver to you)
Order.

i wish it were that easy... but based on the above discussion

How many pins are under yours?
I looked on digikey and the vcos all look like more than 4 pins
Also, yours is clearly labelled with 28.636mhz.
That doesn't read like a variable thing.

it is a VCXO rather than just a VCO, which have much broader freq range. VCXO have a control voltage input that allows the freq to be tuned slightly, in the order of 0.1% or so because you cannot pull the crystal's freq very much due to very high Q they got. The control voltage range is also another concern about compatibility not just the freq itself but I imagine this is part of a PLL so this shouldn't be a too big of an obstancle.

Does that service manual have a parts list in addition to schematics ? It could yield some more info about what exactly is supposed to be in the place but it does seem like there will not be any directly compatible parts to be found very easily, I have not found anything even from chinese sources...

Closest is this : https://www.digikey.no/en/products/detail/ren … 636300I/2153957
But it isn't stocked and it is 3.3V. All other things I have been able to find part numbers of have been 3.3V too.

VCXO. You are looking for something like FAR-M2DB-27M636-F100, SaRonix is another manufacturer making those. Problem is its a 20 year old part (seen here for example in app note from renesas https://www.renesas.com/us/en/document/oth/tb … r-horiz-genlock) and EE moved on rapidly. While VXCO is easy to find and plenty to pick from, almost all will be 3.3V or less.

Tiido wrote on 2024-05-29, 13:58:

Closest is this : https://www.digikey.no/en/products/detail/ren … 636300I/2153957

not a VCXO

It is in a VCXO category, and I went through the part number and the datasheet and it is a VCXO according to it also... But yes, 3.3V and not directly usable.

You are right, somehow I had another digikey tab open and mixed them up. Im sorry.

Tiido wrote on 2024-05-29, 13:58:

Does that service manual have a parts list in addition to schematics ? It could yield some more info about what exactly is supposed to be in the place but it does seem like there will not be any directly compatible parts to be found very easily, I have not found anything even from chinese sources...

Unfortunately, the service manual only lists a Sony part #. Right now all I have is the readily available PAL manual, waiting for the seller to ship the NTSC flavor I ordered since the PAL only lists the PAL crystal.

rasz_pl wrote on 2024-05-29, 14:14:

VCXO. You are looking for something like FAR-M2DB-27M636-F100, SaRonix is another manufacturer making those. Problem is its a 20 […]
Show full quote

VCXO. You are looking for something like FAR-M2DB-27M636-F100, SaRonix is another manufacturer making those. Problem is its a 20 year old part (seen here for example in app note from renesas https://www.renesas.com/us/en/document/oth/tb … r-horiz-genlock) and EE moved on rapidly. While VXCO is easy to find and plenty to pick from, almost all will be 3.3V or less.

Tiido wrote on 2024-05-29, 13:58:

Closest is this : https://www.digikey.no/en/products/detail/ren … 636300I/2153957

not a VCXO

Thank you, these are a good start. In theory, there is enough real estate to toss in a small 3.3 reg. I did measure and that the crystal's peak output is 3.3v, so I might be able to get away with that.

I'll be waiting for the NTSC service manual to arrive, and if the Sony part number is unavailable, then I'll look into these alternates.

myne wrote on 2024-05-28, 14:21:

Huh? The original is 28.636mhz. The link is filtered by 28.636mhz. […]
Show full quote

Huh?
The original is 28.636mhz.
The link is filtered by 28.636mhz.

Why are you on about tuning? It's a simple case of finding the correct formfactor and swapping it.

It's not even close to that simple. There are oscillator modules and then there are bare crystals. Even if it was just a crystal, there are different types of crystals that are not interchangeable. Is it parallel resonant? Is it series resonant? If it's parallel resonant, what is it's ESR and what load capacitance does it require?

I know you've seen youtubers insert random unknown crystals on motherboards to overclock them, but you can't do that and expect good results.