More G07 Issues.

Trioxin

New member
Joined
Apr 27, 2010
Messages
1,144
Reaction score
27
Location
West Virginia
More G07 Issues. (FIXED)

I got my board back today and installed it. The screen came up with the colors right down the middle, i can see the bullets on the centipede firing down the center or the screen... but thats it, i cant get the picture any wider.

I did remove the yoke from the monitor..(diddnt know any better) but im sure its lined up correctly.. what could I check to fix this?


76195_171774866181279_100000462997515_542352_707602_n.jpg
 
Last edited:
Check the solder connections around the yoke connector on the chassis, and the fusible resistor in the vertical section.

-Ian
 
It was ran on a test bench for a week or so and worked fine. Once I poped it in... nothing.

im guessing it has to be something dumb and simple that I did..
 
i dont think so, i was very careful with everything.

I can see the picture...its just smooshed down the center. i tried adjusting the pots?
but nothing. I was excited to play.. but guess thats not happening today.. ha ha
 
Yeah, it's "smooshed" because you have no vertical deflection. Something isn't connected properly. Either a cracked solder joint, a pulled out wire, something. You can fiddle with the controls all you want, but if you want it to ever work, you're going to have to actually check for things like that.

-Ian
 
okay thanks, im gonna pull out the chassis and double check everything. are there any pins that might be hooked up backwards.

I dont know what kind of board he tested my chassis on, so could the plug on the board with 3 or 4 pins around it need moved?

Im new at all of this so im sorry if I dont know the proper terms.

On a side note.. i shocked my forehead really good.. now i feel wooooozy. ha ha
 
okay, pulled it out and checked everything on, near, or around the yoke... nothing was loose or broken. could it be anything to do with the yoke being bad? should I check voltages on anything?

thanks.
 
Verify that you have hooked up the yoke correctly to the chassis and that you are not a pin off.

Assuming that is good, pull the chassis and inspect for hairline cracks in the area of the 2 vertical transistors.
 
got the chassis out as we speak, im checking it all out right now. thanks for the help.

I'll let you know how it goes.
 
the vertical transistors hook up to the heat shields right? 401 and 402?

To test them do i hook my black lead to the base and check the two leg readings?
if so im getting high readings on the legs of 402 and about 5 on the right leg of 401.
 
okay with the black lead on the base im getting 500 on one leg of 401 and zero on the other.

on 402 im getting 508 in one and 1380+ out of the other..
 
Yes, 401 and 402 are the vertical transistors.

Re-flow the solder on them and verify that there are no cracks in between them on the bottom side of the chassis.
 
reflowed, double checked. still the same thing on the screen.

it was tested and working a few days ago. but i have had no luck with it in my machine.
 
okay, I have had it out half a dozen times. checked it over a million times... can't find anything wrong with it.
what should I do now?...? I really wanna play this damn game.
 
yoke

measure your verticle side of the yoke plug(the two closes wires on the 4 wire plug) and see if you have ohms from 8 - 50 ohms( i do not remember what chassis this came out from your reply) and if you do then your yoke should be good. check continuity from yoke jack on board to other spots. If good keep going as i am sure a bad solder joint or trace is your problem.
 
I had two of these on my bench this past week, and both had corroded legs on FR401. One had already broken (fell out when I reflowed the solder as a normal routine touchup), and another broke just from touching it.

If you have a problem there, you'd get this result...
 
thanks Mod. I'm getting a reading of 69 outta that one. so it looks normal. I'm having nothing but bad luck I guess. its gotta be something in the yoke. if I ground to the chassis should I get a reading out of the yoke plug? if not where should I be checking from?
 
Unplug the yoke and measure between the grey and brown wire. It should read about 55 ohms. They connect to pins 3 and 5 on the yoke conenctor...
 
they are dead as a doornail. nothing from brown to grey or from tab to tab where they originate on the yoke. dead yoke? would that cause my problem?
 
Back
Top Bottom