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[Console Repair/Mod Center / Pc-Engine DUO - White Screen - No sound, No Boot, No Bios loaded]

Hi people,

First i would like to say that this forum is a real informations treasure !
Thanks a lot to people who help other people to find solution about PC engine Console. 

Today i have a problem with a Junk Pc Engine DUO i bought.

When i power on it, there is nothing on the TV, only white screen.
Always white screen, with Hucard, Without Hucard. No sound, no CD-rom BIOS..

I checked continuiting points from IC513/IC513 and IC515 with multimeter > Its OK

I replaced some Caps but always same problem. I check Hucard ports and cleaned it with Propylic alcool then looks good... It's seems no burned points on mainboard or under the HuCard port, i checked it.

My questions are :

> What are the first video capacitors to be changed ? Do I have to change them all ?

> What are the first tests I need to do for check that the Video/GPU or Sram or CPU chipsets are OK?

> I read that the chip C6270 can be dead. How i can check it and confirm ?

I'll take any advice about White Screen problem, I really want to find a solution  

Thanks to all