Need G05-802 Monitor Repaired- Cant wait for chad

kjoel

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Hi,

I just cannot wait another 10 weeks for Arcadecup to fix my G05-802 unit. Any other companies you guys recommend?

Chad does good work but the time frame is a deal breaker for me. Worst case I will fix it myself but dont care to do so.
 
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Figured out that the deflection pcb is the issue. I reflowed the molex pins and now the pic is in half. Pulled the deflection pcb. reflowed some more and then the pic was cut off on the right half of the screen. Damn I would like to just buy a working G05-802 deflection pcb and call it a day
 
Your problem could be with the transistors on the side, or the wiring to them...
 
Figured out that the deflection pcb is the issue. I reflowed the molex pins and now the pic is in half. Pulled the deflection pcb. reflowed some more and then the pic was cut off on the right half of the screen. Damn I would like to just buy a working G05-802 deflection pcb and call it a day

I feel really bad for you...
 
Hi Modessitt,

Can you please explain about the transistors. The wiring looks good. What should they be reading if they test good with a digital meter?
 
You need to reflow the solder on the sockets of the frame mounted transistors. Red, yellow, green wires and blue, purple, white wires IIRC You have cold solder joints or it could be the header pins on the deflection board that the wires plug into did you reflow those?

Andrew

Hi Modessitt,

Can you please explain about the transistors. The wiring looks good. What should they be reading if they test good with a digital meter?
 
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The left/right motion (X-axis) of the beam is driven by the Q708 & Q709 transistors. They are two of the four "bottlecap" looking ones mounted off the deflection PCB, on the metal monitor frame. They're connected to the PCB by plug P700. If you have a DMM with a diode-test function, you can remove each of the transistors (they're mounted in neat little sockets, not soldered in) and test them; transistor testing instructions are all over the net. Q708 (the 2N3716) is NPN type, and Q709 (the 2N3792) is PNP type (the instructions will be a little different for each type).

I had one of the deflection amp xistors open on my G05 when I got it; it had only half a screen displayed too. (point is, they don't always fail short...)

EDIT: This image shows how to identify the collector, emitter, and base connections on a variety of transistors packages, including TO-3 ("bottlecap"): http://www.kpsec.freeuk.com/images/tranlead.gif The instructions you find are likely to refer to them as such.
 
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The easiest way to test them is to uplug the connector on the deflection board going to them, then test the pins on the connector. Use diode test and look for shorts. if you find any, replace the transistor and make sure you put the insulator on when you do.

I've also found that a problem with the big connector on the deflection board (P501?) near the brightness pot will cause you to loose deflection, too. Check your solder there, and if you have those damn IDC crimp-down connectors, make sure the wires are in firmly...
 
WOW guys this is alot to take in. I will have to pull the deflection board and then check all this - oh boy !!
 
I finally fixed it. Turns out that I had a very small hairline crack on the solder on the connector to the tube on the chassis. I reflowed all pins and it came up and works great. Thanks alot for all the great info.

Yippee one cab down 2 to go.
 
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