Credit goes to Cali for this section and info...................
1.Hangs/Stuck at Welcome Powering up
a. Prom issues
b. Power Supply
c. RTC/OSC issues ( Advanced- Requires expensive equipment)
If you tivo hangs at welcome powering up, you can try the following:
a. PROM ISSUES
-If your prom is has not been flashed by an Extreme25'd
hard drive, you cannot put a previously booted up
xtreme drive in the unit. It will hang. Reload a clean
image and re-try.
-Another thing you can try is discharging the
motherboard. Unplug the tivo from the wall. remove
the "CMOS" battery. Short out the contact in the
battery holder. Let the unit sit for a few hours. ( Not
a very common fix)
- There is always the possibly of a dead/corrupted prom
in which case you're prob SOL. Prom will need to be
removed, and reinstall a new one. You may need to
load it with base code before installation. ( this I am
not sure about. Ask the code guys)
b. POWER SUPPLY
-Very often the power supply will emit a clicking sound, and your unit will
not boot at all. This DOES NOT necessarily mean the PS is bad. The PS
(power supply) is a switching type and requires a load to turn on. If it is
overloaded (shorts/defective motherboard/defective PS) it will cycle off and
-This is a very common problem causing hanging at the main screen. Use the
schematic to measure the Voltage on the motherboard. A preferred location
is the connector that the ribbon cable plugs into, AND or the caps around
there. Be very careful if you decide to use the connector for your
measurements. Make sure you dont shake, and that you have fine tip
probes, else you can create a boat anchor :)
-Test the hard drive connector for 5V & 12V. Sometimes the PS output will
be a little bit on the low side. Unplug the tivo from the wall and look VERY
closely at the board. You will see a yellow pot (adjustable resistor).
Turning it clockwise will increase the voltage. Plug the unit back in and
use a plastic screwdriver to adjust the voltage level to what you want.
Usually no more than 1/2 turn is needed to bring the PS into operating
range. About 5.2V is ideal. I have ran as high as 5.35 with no ill effects.
(IF and ONLY IF,you know what you are doing you can use a metal
-If any of the voltages are missing or abnormally low ( especially 3v,5V
or 12V) you will need to find the cause.
c. RTC/OSC ISSUES
-I have seen a couple of units with very severe clock issues. You need an
oscilloscope to check these. Usually you can start tracing around the
CMOS battery area. If you have gotten this far, you probably have a good
idea what you are doing. So I'll shut up here.