5" black and white tube TV PK-4184 - looking for composite input

[bubba198]

Hi everyone,

I've got 5" black and white tube TV model PK-4184 and I'm looking for composite input? The TV doesn't have one, it only has an old style analog tuner which is useless now days. The main and only IC running the TV is D2915CP. The PCB has markings TV502PCB. It's a Chinese thing built in early 2000s.

I've looked at the data sheet of that IC and many schematics of similar but NOT identical TVs and I'm still unsure whether it's possible to capture a trace or something like that so I can feed it composite signal, which is my ultimate objective.

It seems that pin 5 is the holly grail but the TVs that do have composite inputs also have bunch of other parts sitting in between pin 5 and the tube driver and those things aren't present in my TV. Any advice would be appreciated!

Thank you
 

[Paul Moir]

It might help to know that there is the very similair KA2915 for which you can get a datasheet:
http://www.promelec.ru/pdf/ka2915.pdf
While hunting that down I noticed someone had rigged a composite input:
http://www.bidouille.org/hack/minitv
(some interesting info in the comments at the bottom)

[bubba198]

that's exactly what I was looking for, pin 5 was always a suspect but now I know that it simply needs to be inverted. thank you!