PROBLEM
Picture | Black vertical |
| |
| lines are visible |
Abnormal | on the screen. |
| |
|
|
Two fine horizontal lines are visible on the screen.
ITEMS TO CHECK |
| LOCATION | |
• Thin vertical black lines on one or both sides of the screen. | • | – | |
This minor condition is caused by grille element overlap | |||
|
| ||
which can occur during shipping. |
|
| |
Position an open white window over the affected area of |
|
| |
the screen and maximize the brightness and contrast |
|
| |
controls. This will cause localized heating of the overlap |
|
| |
which will clear in a few minutes. Be sure to readjust the |
|
| |
brightness and contrast controls back to the normal viewing |
|
| |
levels after this procedure. |
|
| |
|
|
|
�� | �� |
• The 2 very faint thin lines across the screen are normal. | • | – |
They are caused by the aperture grille stabilization |
|
|
filaments(Damper Wires) which are required for all |
|
|
aperture grille CRTs’. |
|
|
| Aperture Grille |
|
| Electron Gun | Shadow of |
| Damper Wires | |
|
| |
| Damper Wires |
|
Shadow of Damper Wires | Aperture Grille Type |
|
|
|
A buzzing sound when power on.
•A brief vibration or hum sound that is heard just after power up is normal. This is caused by the automatic degaussing function. This sound will be heard each time the monitor is powered up from a cold start and each time the manual degauss button is used.
•–
- 20 -