Print Page - PCE IFU RGB MOD weak green color.

Title: PCE IFU RGB MOD weak green color.
Post by: Hakeshu on 10/20/2016, 09:43 PM

Hi,

First time posting here. I hope I'm at the right place.

This week I gathered courage and modded my PCE IFU to output RGB to run on my 13' PVM. I used this french page as my source http://www.obsolete-tears.com/forum/viewtopic.php?f=8&t=7231

All cable are pinned correctly and the AMP is working. But only the color green seems to be weak\fainting. I tried to change the position of the wires on the AMP and the result was the same.

Anyone here had a similar issue like this? I triple checked all continuity on all ends but found no errors at all.

here's a couple images
(https://i.imgur.com/F45zL3Q.jpg)
(https://i.imgur.com/KdMHBkE.jpg)

Title: Re: PCE IFU RGB MOD weak green color.
Post by: Keith Courage on 10/21/2016, 12:55 AM

Whenever this had happened to me in the past, it was because I had accidentally tapped the wrong pins from the hu6260. Double check the pins for the wiring on the amp and that your RGB amp doesn't have a bad solder joint somewhere.

Title: Re: PCE IFU RGB MOD weak green color.
Post by: Hakeshu on 10/21/2016, 02:28 PM

I did some other tests and it appears that the green color isn't showing at all. Removed all R and B cables and the image goes black and white. Changed the wires position on the amp with R and the result was the same. I'm missing something on the PCE board itself?

Title: Re: PCE IFU RGB MOD weak green color.
Post by: Keith Courage on 10/21/2016, 02:36 PM

it sounds to me like you are accidentally tapping the incorrect pins from the board. Please post a picture of the wiring to the motherboard.

Title: Re: PCE IFU RGB MOD weak green color.
Post by: Hakeshu on 10/21/2016, 05:40 PM

Hey Keyth,

Here's my board and wiring. The soldering looks bad but it's not wrong wired.

https://imgur.com/a/evuSw (https://imgur.com/a/evuSw)

Title: Re: PCE IFU RGB MOD weak green color.
Post by: Keith Courage on 10/21/2016, 06:21 PM

Well to find out if the problem is your board/RGB circuit you should try removing the red and run the green wire to the red lead on your RGB amp just to see if the system is putting out green. If it works then something is wrong with your amp circuit.

If this doesn't work then maybe there is something wrong with the green output trace inside your pc engine itself. Green should definitely be coming off of the pin you soldered to. You may need to tap the green right from the hu6260 chip and run it to the necessary exp port pin.

Title: Re: PCE IFU RGB MOD weak green color.
Post by: mickcris on 10/21/2016, 09:15 PM

Did you check continuity between green and ground? The green wire at the exp port looks really close to that ground point is running over

Title: Re: PCE IFU RGB MOD weak green color.
Post by: Hakeshu on 10/21/2016, 11:01 PM

Damn I guess I found the problem. Did a test with my snes with composite on the G plug and it output a black and white image. Asked my friend to do the same test on his PVM and the output is green. Well I guess my problem is my PVM. Damn I hope I can fix this.

Title: Re: PCE IFU RGB MOD weak green color.
Post by: Hakeshu on 10/22/2016, 08:27 PM

Hello guys. I managed to get the RGB working. Opened the PVM, did a clean up and some screws. Check the result

(https://i.imgur.com/kVbwS4h.jpg)

Thanks for all the help.

PCEngine-FX.com

NEC PC Engine/TurboGrafx-16 Games/Consoles => Console Repair/Mod Center => Topic started by: Hakeshu on 10/20/2016, 09:43 PM