PLUS4 (C16) how lowering temperature for TED CPU chips

MCes

Member
Joined
Sep 30, 2013
Posts
977
Country
Italy
Region
Rome
Recently I measured the current absorbed (5V line) by my plus4, it was near 1A

P_20190613_162243.jpg

It means around 5W of dissipation, so my PLUS4 has to rise its inner temperature to reach the thermal balance for dissipate 5W.
This over-temperature is the ambient where TED and CPU are immersed, making their surface temperature more high.

how it's possible to lower the TED and CPU temperature? simply: putting them in a fresher ambient!

It can be done replacing old chips with chips that use more recent technology: they use a lot less power, and heat the ambient a lot less....

The first "oven" is the original PLA, but also the ROMset don't are joking....

Replacing PLA and 4 ROMset the current of my PLUS4 fall down of 30%!!!!!

P_20190613_165052.jpg

There is a "direct relationship" between W used and over-heating inside the PLUS4, so now my PLUS4 have 30% less over-heating inside: my TED and CPU are immersed in fresher place, so they will be fresher (their temperature will be lowered by the same degrees as the internal temperature will be lowered)

I was thinking only to replace chips that are cheap to be bought, but if you replace the CPU with a "C-MOS substitute " the thermal gain increase: 80mA of less current!
https://www.amibay.com/showthread.php?106203-8501-replacement-for-C16-Plus4-work-in-progress

P_20190613_165740.jpg

Originally 1A now 0,6A: overheat is limited at 60% of nominal,
with benefit for all old chips, for the TED, and to Power Supply Unit too!

NOTE: all without modify the motherboard (and preserving in a drawer the expensive and rare original chips...).

The same idea can be applied to C16....
 
Last edited:
This is a PLUS4 with original chips (Icc=971mA):
PLUS4-original.jpg


The same PLUS4 with C-MOS ROMset and a PLA gal-replacement (Icc=684mA):
PLUS4-all_C-MOS.jpg

The difference at thermocamera are evidente...

Now an original C16 (total Icc=720mA):
ORIGINAL.jpg

and the same C16 with replacing the 2ROMs, 1PLA and using my CPU C-MOS replacement (total Icc=495mA):
ALL C-MOS.jpg

HEAT CHANGE.jpg

and PSU can also work fresher...
C16_PSU.jpg
 
Last edited:
Immagin a C16 with a static RAM 64k internal expansion, so replace on it the old N-Mos romset with only one C-Mos ROM that replace the 2 old original roms and that also has inside the FUNCTION "3+1" software, like a +4....
More functionalities, less heat....

FullRomset2.JPGFullRomset3.JPG
 
Immagine a PLUS4 that use only 1 fresh C-Mos ROM and not 4 hot N-Mos ROMs....

P_20191103_150657.jpgP_20191103_150028.jpgP_20191103_143823.jpgP_20191103_143441.jpg

The internal overheating will drop about 25%!!!!
 
Back
Top Bottom