LG Studioworks 520Si monitor; doesn't power up after disconnected the deflection coils

Aug 30, 2005 3 Replies
K

Hello,



I have a bit of a problem with a LG Studioworks 520Si CRT monitor. I got it today and powered it up, but with no computer or whatsoever attached. Everything seemed to be working fine. The next thing I did (my reasons are unimportant ;-)) was disconnecting the four wires which connect the 2 deflection coils to the big circuit board of the monitor. When I tried to turn it on, the monitor began producing a sort of a 'beep' sound, which repeats itself very quickly (until I pulled the plug :-)). Also, the LEDs on the front except for the power LED are blinking in the same 'rhythm'. I disconnected the power cable and plugged the 4 wires back in, but the problem persists.



I took a look at the board, but I don't see any damaged parts. Has anyone an idea on how I can solve this, or did I just destroy a good monitor (hopefully not :-)).



Thanks in advance.



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M

You probably blew the horizontal output transistor, possibly some related parts along with it. Never randomly pull connectors unless you want to sabotage the equipment.

Met vriendelijke groet,

Maarten Bakker.

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G

Reminds me of a job I was asked to do many years ago at the local TV studio. I had to modify two CTV's so that the picture was the right way when the sets were suspended upside down from the ceiling . Can't recall why they had to do it that way.

As the other poster said, the HOT is probably short, It's the power transistor on a heatsink near the flyback transformer.

Graham. %Profound_observation%
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