Luigid
.
- Joined
- Sep 24, 2017
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- 53
Hi guys, after some tests I managed to undervolt the PS2 79001 from 1.25V to 1V as indicated by someone with external regulators + custom trim.
For my part, I wanted to stick with the standard controllers to do some tests. It could still be useful for those who want to increase the life of the console and/or perhaps, as in my case, save a lot of heat and battery on a portable system.
I started to understand where and how the 1.25v was generated, thanks to @Mister M for the board scan.
We have dual sync step down switching controllers Texas Instruments branded.
In the case of the 79001 it generates 1.25v and 3.5v, so we have to adjust the output to 1.25. searching online to understand which integrated circuit was in question (with the acronyms stamped on the chip there is no confirmation) I discovered that it was used from the first versions of the PS2 up to the PS3 fat, the model is:
sn105233dbtr
In the end it would seem to be (almost) a: tps5124
analyzing the screens of both the ps2 7000x and the ps3 fat in order to have some examples I started by reading the resistors and replacing them with multi-turn trimmers setting it to the same value as the removed resistor I identified the one involved on the second attempt:
the original resistor is 6.8KΩ, to do the test to get a precise 1v you need a resistor of around 17kΩ, in my case having only 18kΩ SMD resistors and having little space I opted to install the 18kΩ one (another way would be to take a 10kΩ one and add it in series to the original 6.8kΩ one)
The tests have led to truly remarkable results...
Test with standard 1.25V:
Tested with same setup but with 1v mod for cpu/sb:
with a power supply of 7.6V the consumption varies between 1.2A/1.3A.
you have about 250ma less consumption in addition to the fact that the CPU is practically lukewarm, in a test lasting over 30 minutes nothing crashed and the CPU remained lukewarm as well as the SB.
It would be interesting to understand the minimum limit in which it can be powered, the same for the 9000x having a more recent CPU. In the case of the 79001 the original regulator can be brought to a minimum of 0.9v, in my case with the 18k resistor we are at around 0.990v
obviously take the guide very seriously, a cold or badly made solder can destroy your CPU/SB.
For my part, I wanted to stick with the standard controllers to do some tests. It could still be useful for those who want to increase the life of the console and/or perhaps, as in my case, save a lot of heat and battery on a portable system.
I started to understand where and how the 1.25v was generated, thanks to @Mister M for the board scan.
We have dual sync step down switching controllers Texas Instruments branded.
In the case of the 79001 it generates 1.25v and 3.5v, so we have to adjust the output to 1.25. searching online to understand which integrated circuit was in question (with the acronyms stamped on the chip there is no confirmation) I discovered that it was used from the first versions of the PS2 up to the PS3 fat, the model is:
sn105233dbtr
In the end it would seem to be (almost) a: tps5124
analyzing the screens of both the ps2 7000x and the ps3 fat in order to have some examples I started by reading the resistors and replacing them with multi-turn trimmers setting it to the same value as the removed resistor I identified the one involved on the second attempt:
the original resistor is 6.8KΩ, to do the test to get a precise 1v you need a resistor of around 17kΩ, in my case having only 18kΩ SMD resistors and having little space I opted to install the 18kΩ one (another way would be to take a 10kΩ one and add it in series to the original 6.8kΩ one)
The tests have led to truly remarkable results...
Test with standard 1.25V:
- Dalian good screen 5,6 (modded 5v powered)
- A5-V11 3G/4G Router custom fw + kingstone 64gb
- ps2 slim 79001 + pth8080 for 5v (all 7805 removed) - standard cpu/sb voltage (1,25v)
- Game tested in ethernet --> Dinasty warrior 4
Tested with same setup but with 1v mod for cpu/sb:
with a power supply of 7.6V the consumption varies between 1.2A/1.3A.
you have about 250ma less consumption in addition to the fact that the CPU is practically lukewarm, in a test lasting over 30 minutes nothing crashed and the CPU remained lukewarm as well as the SB.
It would be interesting to understand the minimum limit in which it can be powered, the same for the 9000x having a more recent CPU. In the case of the 79001 the original regulator can be brought to a minimum of 0.9v, in my case with the 18k resistor we are at around 0.990v
obviously take the guide very seriously, a cold or badly made solder can destroy your CPU/SB.
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