Re: problem with samsung syncmaster 720V when insert vga cable



are there voltage regulators on the logic board? it's better if i get the photo... tomorrow i will try.
The PSU powers logic board with +12 and +5V...

Re: problem with samsung syncmaster 720V when insert vga cable



damn i think you are right...
i did further test:
the whistle starts only when lamps turn off and stops when lamps turn on... maybe the problem isnt the capacitors...

When i insert vga, lamps always turn off and sometimes (not always) power led starts to blikining......

Re: problem with samsung syncmaster 720V when insert vga cable

Thanks both for reply.



If the problem is the logic unit i can throw away this monitor lol... i hope the problem is on the PSU but i'm not sure obliuvsly... but i hear a whistle coming from the psu when the problem appears.

@retiredcaps: ok but at this moment i dont have cams. i can shoot a photo with mobile phone but the quality will be bad...
I will try it...

Hi
I found this lcd monitor and i'm trying to get it work
First of all i tested it: with only the power cable inserted, the monitor works well, displaying "no signal" etc.
When i connect vga cable to the monitor to testing the signal, lamps turn off and sometimes the power led starts to blinking.

I opened the monitor. No visible damage to the components or bad smell or burns.
I measured the voltage without signal cable. 5V and 12V are stable.
When i connect vga, lamps turn of, sometimes blinking, and i hear a little medium frequency...