Hi Guys,
I pondered creating a new thread for this but thought it'd make more sense to post here. please let me know otherwise and I will create a new thread or post elsewhere.
Thanks to the great work of mikejmoffitt, Voultar, Syntax and others, I decided to mod my first CRT. Really great information out here.
It's mostly working but the blacks are grey. I was hoping some of you had some suggestions on what to try next.
Below is a summary of how I wired things and the troubleshooting steps taken
https://i.imgur.com/5pIBQil.jpg
https://i.imgur.com/kv3uaOy.jpg
https://i.imgur.com/B050Dqm.jpg
-The TV is a Sony KV-PF14P10. The Jungle IC is a CXA2139S, which I could not find a proper datasheet of, only screenshots from service manuals using this chip. Based on previous comments and the similar pinout, this chips likely behaves very similarly to other CXA21xx jungle ICs
https://www.manualslib.com/manual/87674 ... tml#manual
These are the steps I've taken to execute the mod:
-lifted pins 28, 27,26,25 of CXA2139S
-added 0.1uf caps to the RGB lines (28,27,26) and terminated 75ohm resistors to ground.
-Tied a 5V to the blanking pin (25) and put a 100ohm resistor in between as per diagram
The VCC of CXA2139S is 9v, I tried with that too with same results, but by fear of feeding voltage too high to the blanking pin I wired 5v to it.
-made sure to ground the 3 RGB pins sync pins on the female scart connector
-I am using composite for sync as that’s all that’s available. I tried to see if I could inject sync directly into the CXA2139S, but really not sure how to after reviewing all available pins on CXA2139S.
The results:
-The picture is very sharp and colors appear to be correct (too bright without 75ohm termination)
-The blacks are very dull, they basically are grey
-The picture is shifted to the left (I understand this is most likely due to my sync input going through composite)
-When no SART connector is connected or the console is off I get a grey screen with vertical lines on the left side of the screen:
https://i.imgur.com/5pIBQil.jpg
-Reading posts by Voultar, he mentions “black restoration” which sounds like what I need
. However the proposed solution is to use 0.1uf ceramic caps as per service manual which I have definitely used.
Any help with this would be greatly appreciated.