Problem philips c52 rgb mod

[philippe30]

Hi
i have a problem with a mod.
line are like the photo
somebody can help me
(sorry for my english)

[VideopacBelgium]

Hi Philippe,

Maybe the same problem as:
https://videopac.nl/forum/index.php?topic=1218.0

Marc

[philippe30]

Hi Marc

it's not the same Mother board and i thonk it's not a problem pal/ntsc

ty

[VideopacBelgium]

I think this is a sync. problem.
What kind of C52 you have?
Could you post a picture of your C52 motherboard?

[Rene_G7400]

This is either a sync problem or a missing blanking signal. Do you have a schematic of the mod that you used?

[philippe30]

hi

thanks for answers

here the post of my c52 motherboard and the mod schematic i do

i try to change 668 pin2 or P7-7 , same result

[VideopacBelgium]

On my RGB mod, I used a TR BC548 for the sync. 

[philippe30]

do you have a schematic for this motherboard

[Rene_G7400]

You can't use the blanking signal as sync signal. You'll need the transistor circuit as in the G7200.
Since the 12V status CVBS signal is missing you need to make sure that your TV is switched to the SCART input.

[philippe30]

Hi rene

i try this mod but it don't work too. It's similar without U4 and U3.
i can try again but where i connect this points on the motherboard:
1,2,3,4 = ok
5 = ?
6 = ?
7 = ?

ty

[philippe30]

hi

please Rene, help me, it's doesnt work.
I have a problem with pt 5, 6, an 7

[Rene_G7400]

Hi Philippe,

I'm sorry, I was very busy with other Videopac projects.
I do have a service manual of the C52, but I don't have a scan of it. Please refer to the scan of the G7000, as it is almost the same.

pt 5 should be connected to pin 11 of IC 669 with an extra inverter (74LS04)
pt 6 should be connected to pin 6 of IC 668 with an extra inverter
pt 7 should be connected to pin 3 of IC 668

[philippe30]

 
Youpi, all it's ok, look at the picture.
TY Rene

I give too the schématic i use