What model of PS2 is it ? I remember this kind of problem being "un-common but possible" on units made from 2000 until 2002 (V0, V1, V2, V3 and V4) and is caused by some damage on a certain ceramic capacitors block which connects the Graphics Synthetizer chip to the video encoder.
Originally Posted by mikeeunice
I remember repairing two units with that problem on my PS2 repairing career (lol) and both were the capacitor block.
SCPH-10000_GH-001 SCPH-15000_GH-003 SCPH-18000_GH-008 SCPH-30001_GH-005 SCPH-30000_GH-016(V4) SCPH-30001_GH-010(V4)
2xSCPH-10190, 2xSCPH-10350, 2xSCPH-10280
"**** j0 hackers!"
-Sjeep (As seen on TOXIC OS ELF...)