MOD GUIDE - Universal RGB-to-YPbPr/Component Circuit & Mod [8/24/2014]

[thesteve]

check it again
the sync amp is wired wrong

[thesteve]

more like this

[thesteve]

try this one

the designators have changed
R1 AND R2 10k POT
R3 100 OHM POT
R5 10K
R17, R19, R20, R21 75 OHM
R18, R12, R6, R16, R11,R10  500 OHM
R13 15 OHM
R14, R15, R7, R8, R9,R4 1K

C1 22UF
C2, C3, C4 100UF
C5, C6 470UF

[crans]

Thank you turbokon. Seems I'll have to push the current ones I got real quick. One I can use but two others idk.....I can drop ship for you from California ?

[thesteve]

new designators to match board layout

[crans]

@turbokon

Looking forward to your report how this is better or worse then your current mod sold.

[thesteve]

the signals are more stable
higher clarity
better black level
better green purity
more consistent brightness over different sources and displays
higher contrast range (adjustable)

[crans]

I might have to take a trip to all electronic and make one. Now only if i can find a clone store to copy my self 10X to keep up with work.

[thesteve]

if you have the previous handy it can be upgraded much easier then building new (thats how i proto tested)

[crans]

i have two ready to be upgraded.  ill have to dig through this thread and see whats changed and work on it

[thesteve]

wow, i just looked at mine, i have a few resistors marked wrong
i had R8,  R9 2K not 1K
switched R9 to 1K and the color got even better


corrected values

[secnine]

i picked up a rev 1 board from turbokon, but hes out on vacation atm,  so i wanted to see if anyone else had the same issue im running into...

I am using a PEXHDCAP capture card, and the picture does show up albeit dark , however as soon as i start any game play it seems it flickers and looses signal , like im draining the power as i hit the controller buttons.. i am currently testing with one game blazing lasers.

The software I am using is amerec and stream catcher and they seem to have the same issue. a strobe affect that cuts the picture off..

My settings on the capture device are 720x240 YUY2 59 FPS

I checked the voltages and seems to be low compared to some of the posts ive read.. so i dont think its a compatability issue..

I wonder if the new circuit design will help here.

heres my DMM Input readings

Sync = 4.94v
G  = 4.16v
R = 4.15v
B = 4.2 v
5v = 5.00v

Output
Y = 901mV
Pr = 2.88v
Pb = 2.61v


I am using this on a north american TG-16, after crafting my own crimp housing with jumper cables to the expansion port, so im wondering if theres any improvement in the new design that might help me here.

I don't have any other CRT to test except VGA, and a composite upscaler, so im looking around for someone who might have one to test.  I am also wondering if its a length issue of my component cables.

[thesteve]

ok yes the new design does address this issue with some games/tele's, havent tried a capture card

[Keith Courage]

try adjusting the Luma gain potentiometer. Some TVs don't like it being down too low or too high. Gotta mess with it a little to get that sweet spot so the pick doesn't flicker on and off.

I have to turn down the gain slightly or I loose picture using the TV in my living room.

[thesteve]

lens?
luma perhaps
also the new board has much less trouble with it