Having problems with your LG Flatron 776FM 17" CRT Monitor ?

LG 776 FM - sounds of sprk and instant blank of the screen

\015 The monitor wasn't in use for some years.\015\012When pluged it, sounds like explosion from inside, since then, I hear every few minutes sounds of sperk from the inside and the screen gives "a jump", like being blanked for a part of a sec.\015\012I looked inside to find if I can see some visual demage of the capacitors or some burned component, but nothing.\015\012Any direction?\015\012schem?\015

Answers :

That sound you heard was the crt.
\015\012The best solution would be to get a new monitor.
If this an old CRT screen and was left for some time probably you are experiencing HT spaking from the anode cap on the screen , if you leave this too long it will destroy the line output oscilator transistor or the actual transformer . The solution is quite easy , firstly dissconnect the monitor from any supply and your computer , remove the cover and you will see a round rubber cap with a lead going to a transformer on the circuit board .
\015\012With two HEAVILY INSULATED LARGE SCREWDRIVERS gently with one place on the chassis , the other touching the first sliding under the cap . if it is charged there will be a loud crack as the tube discharges to ground . If it is not charged you will probably just get a minor crackle . Using the screwdiver gently ease the cap off it only presses on so should come off easily , then clean with a nice dry cloth for safety as some screens still retain a charge I do this with the cloth on the end of a dust pan brush plastic , or some other material not conductive .
\015\012clean the cap itself and smear a little vaseline or other light grease around the cap and replace .
\015\012If after this you can still hear the crack then the HT transformer has probably perrished insulation and wants replacing . hope this is of help from your description I gather you have already taken the back of this set off so I accept no responsibility for the advice given if you attempt it . All electronic equipment should be serviced by qualified personel at all times .
Repair Help & Product Troubleshooting for LG Flatron 776FM 17" CRT Monitor

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