G05-805 Problem

[tb lilley]

I recently picked up an Asteroids DLX cabaret. Cab was in poor condition, had been left standing and neglected for 10-15 years.

Managed to get it up and running, fitted with an Asteroids PCB. I ran the cab for about 5 hours straight yesterday, all was well, but monitor has now started to play up. Monitor is 15" G05-805.

Picture has started to 'jump':


Any idea what might be causing this, and what the fix is?

tb lilley2012-04-08 15:52:16

 

[DanP]

Cold solder joints on the main chassis PCB would be my first port of call.

Dan

 

[tb lilley]

Cheers, yeah, I had a very good look at deflection PCB shortly after getting the cab. At first monitor had no HV. Sorted that by reseating HV diode. Monitor good as gold ever since. So I've already had a pretty hard look at both HV and deflection PCBs. Couldn't see much in the way of suspect solder joints.

Yesterday was first time I've ran the monitor for any length of time though. I'll pull deflection PCB and see if anything obvious has developed. But was wondering if anyone might be able to offer a few more specific clues.

 

[Equites]

Not sure if a worn edge connector could produce those results but worth checking, also the pots on the deflection board. Maybe give them a good twist.

 

[tb lilley]

Cheers Nad. Will do. Will have to wait a few days now though. Mother in law is here, and expecting a house full tomorrow. Only one thing for it, crack a beer and watch second half of the footy ....

 

[Equites]

Best behaviour hat on then....

 

[tb lilley]

Not really. SkyGo, iPad, headphones, beer. Body language set to: Do Not Disturb.

 

[P-Man]

This looks to me like a PCB problem, check the vector rom is seated properly.. and why is it in spanish? Do your dip switches work? if they dont, this could be related.

Don't fiddle with the monitor, thats not where the prob is.

 

[tb lilley]

Dips are fine. Just havent got round to changing to English. I'll check out vector ROM and reseat. Had a fiddle with pots, reseated connectors. Also, there is a wire that runs directly to ground of the main connector. Not screwed down properly (sits with rest of green wires that ground on the power brick). Now back to working:


Not optimistic it'll stay that way though. I'll give it another thorough run tonight and see what happens ....

 

[tb lilley]

This looks to me like a PCB problem,

Cheers for this, you were right. Stopped me barking up wrong trees.

This is first weekend I've had the cab running properly. Plumbed the sound in Saturday (I.e. attached some speakers). Sound was horrendous. Massive hum and distortion. Suspected bad TDA2002s on AR1. That lasted 5 mins before lost the +5. Fuse blown on power brick. Unplugged AR board, replaced fuse. Powered up, fuse blew again. Checked bridge rectifier - blown. Replaced rectifier, fuse stopped blowing. Stuck a spare AR2 in there instead. Gave me +5 back, and clean sound.

Job done, or so I thought. Late on the Saturday is when the issues with the monitor started. Yesterday started to look at Asty PCB rather than monitor. +5 reading about +5.2 (hadn't bothered propery checking voltage after chucking the AR2 in - very sloppy .....). Dialled voltage to read +5 on the board and problem solved ... now been fine for best part of a day.