Another Dead Color Classic - No power on, before and after cap replacement.

[Classic_II]

Hey Guys,

I have a color classic that has worked great though the years. Tried to turn it on this week and got nothing... I guess the caps finally went. 

Opened it up and had a little leakage, cleaned up with Isopropyl and ordered some caps from console5.

Caps arrive and I replaced them but it still doesn't power on

I started reading all the previous posts here and started checking voltages and traces.

What I found out was, the system WILL power up when the board is removed. As soon as I plug in the board the system immediately shuts off. 

I checked the Analog Board Voltage and have a good 5v and 11.95v.

After messing around I was able to get the board to go in and the system stayed on, but i only got a black screen with horizontal lines. After I took the board back out and inspected it I found the Ti 9307XN Chip in the upper right corner by the 2 100 and 47 caps was very HOT!!!

Checked the traces around it and could not find anything off. Maybe this is the problem ?

I am hoping you guys can help

 

[bibilit]

Capacitor shorted somewhere ?

 

[Classic_II]

I removed all the caps and re soldered them, no change. 

I removed the cap right next to the chip and it no longer gets hot. But still have no clue what the issue could be. 

 

[bibilit]

Can be the Egret chip being contaminated, happened to me more than often.

IIRC there is also a capacitor next to it and battery holder.

View attachment 8746

 

[elemenoh]

Try cleaning underneath the egret chip and replacing the crystal next to it.