Help!!! Asteroids Deluxe G05-802 Monitor

jarnold007_1

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I need help I'm still blowing both 5amp fuses on the deflection board. The game plays blind just no picture and sound is great. The kill light isn't on and monitor has the orange glow at the bottom which shows its getting power but no power to the HV Diode.

I've done a complete cap kit with transistors on the Deflection Board, HV Board, and Main PCB, and AR Board also replaced the HV Diode, bridge rectifier on the deflection board, and rectifier diode. I also re-flowed all the pins on the deflection board. Lastly I changed all four XY Deflection bds.

The only thing I didn't do was change big blue, it's bridge rectifier, and fuse. But it seems to be working

What could be causing the fuses to blow.

What is my next step?????

Help!!!

Here is my part list.
1 1N5401 Diode (NTE 5801) 3 Amp 100V

1 KBPC-802 Bridge Rectifier 8A 200V

1 GO5-802 19" B&W X-Y w xsistors

2 6800uf50volt radial for XY monitors

1 Atari A/R or A/R II-01 Repair Kit (Caps+Q2/3+R29)

2 MPSU57 - XY Deflection bds TO-202N Pkg

2 MPSU07 - XY Deflection bds TO-202N Pkg

1 Main PCB Cap Kit
 
People generally respond negatively when the same thing gets posted in multiple forums. Usually best to carefully consider where it belongs, the post once in that forum.

Thank you for fully identifying your monitor model.

I need help I'm still blowing both 5amp fuses on the deflection board. The game plays blind just no picture and sound is great. The kill light isn't on and monitor has the orange glow at the bottom which shows its getting power but no power to the HV Diode.

OK, the 5A fuses, F100 & F101 are on each leg of the input power. If the game plays blind, then the PCB is at least "more-or-less" running. The spot killer being off is generally a good sign, indicating that X & Y deflection signals are present, but far from a sure thing; these LEDs are sometimes failed themselves. So it being off tells us very little at this point. The orange glow in the neck of the CRT indicates that you're getting the 6.3VAC (filament, or "heater" voltage) from the input connector all the way to the neck. The filament voltage is totally seperate from everything else in the monitor. It's possible to hook up only the 6.3VAC and nothing else, and the neck should still glow. In any case, the neck glowing is necessary, but not sufficient. Regarding "power to the HV diode"; I'm not sure how you made that conclusion. Perhaps the easiest way to determine if you have high voltage is to try putting a piece of paper on the face of the CRT and see if it sticks by static cling.

I've done a complete cap kit with transistors on the Deflection Board, HV Board,

Good. Now double-check your work to make sure that none of the caps were installed backward, and that all of your solder joints are good.

and Main PCB, and AR Board

Fine, but of no concequence to the monitor.

also replaced the HV Diode,

There are a number of diodes in the HV section, but I assume you're referring to the really big one in the line to the anode cap (D904, H1308?). This is usually done to prevent the image from "blooming." Don't know if you had that problem, so this may have been a little premature.

bridge rectifier on the deflection board,

Good! Double check to make sure it's installed properly, and the joints are good.

and rectifier diode.

Not sure what you're referring to here. Please clarify.

I also re-flowed all the pins on the deflection board.

I assume you're referring to all of the header pin solder joints. Good.

Lastly I changed all four XY Deflection bds.

Assume you mean all four XY deflection transistors, Q608/609/708/709, but I'm not sure based on your parts list...

The only thing I didn't do was change big blue, it's bridge rectifier, and fuse. But it seems to be working

Big blue only filters power which is used to generate the regulated +5VDC for the game PCB, and the power for the audio amps. Has no bearing on the monitor. Nor does the rectifier in the power block. The only things from the there that go to the monitor are 6.3VAC for the filiment (which it would appear you are getting) and (IIRC) ~60VAC for the monitor power... which you must be getting 'cause it's blowin' out your fuses.

What could be causing the fuses to blow.
What is my next step?????
Help!!!

Not to be snide, but the answer is that something is pulling too much current on those lines. It's likely nothing in the HV unit, as this is fused seperately by F102 (1A SB). I'd check C100 & C101 for shorts. These are the main power filter caps, and may not be included in cap kits. If that doesn't yield anything, check out the B&W Vector Montior FAQ here: http://www.crazykong.com/tech/bw_vector_monitor_faq.pdf

There's a schematic in here: http://technical-department.servegame.com/monitor_schematic_diagrams/electrohome/G05-802.pdf

EDIT: One more thing... are you using 5A SLOW BLOW fuses?
 
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