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H2O v14 problems (many).
H2O v14 problems (many). –
I have install over 150 H2O in v14-15 (all pal ).
In some consoles have problems with copied games .
The ps2 load ---> display PLAYSTATION 2 logo --->
--> Black screen ----> RED SCREEN Of DEATH
After reset game load 70% of times .
For the 30% need Poweer off .
In some consoles go direct to RSOD
and need 2-3 reset or hard reset (power off ) to load.
I have fat and short GND and +Vcc cables.
I solder the A,B,G,I direct to cd/dvd controller.
Any idea plz ?????
Especially for Problem 2:
Use one 1Kohm resistor between Vcc and GND. Sometimes the voltage at Vcc doesn't go to 0V in standby and the chip doesn't reset properly.
EDIT: Now I see they use a Texas Instruments CD74HC73M J-K flip-flop powered at 5.1V. This is a mistake.
At 4.5V, the datasheet specifies the minimum high-level input voltage to 3.15V. At 5.1V it is 3.57V, more than the 3.3V of the A strobe of the CD-DVD controller bus. Even worse, the clock input has a Schmidt Trigger buffer. This has a hysteresis that causes the transition to 1 to take place only when the signal is above the specified level.
This usually happens because of the short pulses caused by the fast switching edge of the signal. But this is not guaranteed to always happen and is not even desired to happen.
I also use 74HC73 flip-flops on the chips I build, but I power them at 3.3V, so they are well inside specifications. The solution to your problems would be to lift pins 4 and 14 of the 74HC73 and power them at 3.3V. Probably there is a power track on the bottom of the PCB that can be cut, so to avoid lifting the pins.
Another solution is to desolder the 74HC73 and use a 74HCT73, something that the makers of the chip should have done in the first place.
Last edited by Emanuel; 12-18-2005 at 01:34 PM.
I have the same problems as Villasg. Just tried the Emanuels solution ( lift pin 4 and 14 and connect them to 3.3v ) but no success !
Last edited by psxgameshop; 12-18-2005 at 03:14 PM.
Did you also try the 1 Kohm resistor between Vcc and GND ?
I really can't think of any other solution. Do these problems exist on V14 only? If yes, then it may be a a flaw in the new v14 code. I didn't have any of these problems, but I didn't have any v14 to mod.
I don't have 1kohm resistor to try, I will try this tomorrow.
I have only V14, and I have moded 12-13 consoles with H20, but I have the same problems on all of them. When I get my hands on another version I will try and post the results.
I guess the h2o is not a good solution for v14s.
Well, It's not that bad...In my case it have 80% bootrate.....Those problems appears sometimes, but not very often and I have no complains from my customers.
On PAL V14 dont use the Z wire.
what is the z wire for maybe summone can tell us i think no other chip uses it.
Z wire is for detection of changed disks. It is high when the disk tray is out or the lid is open. It is low when the disk is in.
The Z wire could cause problems if there is noise on that line or if the micro-switch (on V12-V14) doesn't make a good contact.