View previous topic :: View next topic |
Author |
Message |
vince Guest
|
Posted: Mon Dec 12, 2005 1:36 pm Post subject: What are the symptoms of a failing Cathode Ray Tube or parts |
|
|
I have a 60" Philips rear projection television with problems noted on this site on the 10th of this month. Anyone know what happens when the CRT or any of it's components fail? |
|
Back to top |
|
|
jb38 Guest
|
Posted: Thu Dec 15, 2005 12:09 am Post subject: Failing CRT symptoms |
|
|
It can manifest itself in various ways, but the most common is for the picture to have lost its brilliance, this happening over a period of time, maybe about six months or more, and also the contrast to be poor with a washed out looking picture, and any attempt to increase the brilliance level usually results in a still dull, but blurred picture.
The above is caused by low emmision of the tubs drive guns. In the past a booster transformer was fitted to overvolt the filaments (heaters) which overcame the low emmision problem (for a while anyway), but this is not really done so much nowadays. |
|
Back to top |
|
|
Guest
|
Posted: Thu Dec 15, 2005 12:11 am Post subject: Re: Failing CRT symptoms |
|
|
jb38 wrote: | It can manifest itself in various ways, but the most common is for the picture to have lost its brilliance, this happening over a period of time, maybe about six months or more, and also the contrast to be poor with a washed out looking picture, and any attempt to increase the brilliance level usually results in a still dull, but blurred picture.
The above is caused by low emmision of the CR tubes drive guns. In the past a booster transformer was fitted to overvolt the filaments (heaters) which overcame the low emmision problem (for a while anyway), but this is not really done so much nowadays. | |
|
Back to top |
|
|
|
|
|
You can post new topics in this forum You can reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
|
eServiceInfo on FB -
Service Manuals Free Download -
Service Diagrams
Free TV Schematics Download -
HARDW.net -
Pinout Master -
Jabse Service Manual Search -
Jabse.InK -
onTap.bg
SnimkiOt.com -
Poblizo.com : пътешествия
Latest Service Manuals :
C1570 Lite On • General EP4000 023 Minolta • toshiba 289x6m TOSHIBA • Panel CMO N156B3-L02 0 [DS] . Various • MQM100216 MB98 V2 panasonic • Panel AUO T260HW02 V1 1 [DS] . Various • 46F500 Hitachi • HCD-S500_800 Sony • DSC-W5 W7 W15 W17 Sony • MMD430DZX ET-SB-EX-SI 1360147292 Samsung •
|