very new to this and so far i only know it is getting 120v at the white/green/black plug into board and that the little fuse is good dont know where to test from there, see no caps that "appear" bad but i know appearences dont mean all,,,,any help appreciated,,,i did watch 1 video that showed how to discharge board but kinda clueless in what to try
Ok, Thinking about the KT2938 chassis
This is a good one to send out, Or Get ready for level 3 troubleshooting it
out of the game. and extend the signal cable to work beside the game
on the bench. Level 3 means you can replace parts without damaging it or the board
and can recognize a diode or transistor etc. And have a volt meter!
If degausser does click or keep clicking
No need to test the secondary voltages 12 and 5
if the relay clicks, it must have the 12 to work at all
that is two of the secondary voltages needed first besides
The primary voltages and a clue you have some secondary voltages.
And can also mean the shutdown circuit is not allowing complete startup
meaning there's a short some where in or beyond the secondary's
like H.O.T scan circuit,
Need to address the parts I mention first
for voltage or a short on a supply line.
All secondary voltages need to be check for the over all
evaluation no you don't need a manual
to post what the voltages are? On the band side of the diodes
in the 100 Block only on the secondary side of SMPS
Most TPs will be positive voltages found yes will need the location
of test points. as a reference.
For no degausser relay Click.
See Primary voltage first!!
chassis with Micro/Eprom/degasser relay is used.
when Power up Micro energizes the degausser and then shut it off
by default, Once the reset line for digital circuit pass, then it should stop
clicking. If RELAY is annoying just remove it,, while TS the chassis
Its not the issue here!
Once AC in power supply Is converted DC then
It always goes to the filter cap, And easy to find on any chassis
and using the Filter cap ground, you always know the HOT Ground is
to test Primary Voltages. To Test DC like PWM IC and Mosfet dc at drain
Test point.
Cold ground like ground for neck board major heatsinks like The HOT
is good if common to all other grounds to crt ground.
to test dc on secondary voltages from the SMPS
Post the board so all parts can be seen
in the photo and in focus, I don't have a schematic as well
Its some where. Need to see the Power supply clearly to post test points
you should make while waiting on the schematic.
I don't guess mostly.. I look for facts leading to the defective parts
I would need more details before I would suspect the HOT Or Flyback.
Research your model here for common bad parts found and tips
Ready to try Or Just send Out for repair?
LUK