Question about Televison & Video
Screen is becoming dark. One tech recommended that the crt socket boards just need to be reseated because of corrosion. How do I do this?
First if one was loose that color (red,green or blue) would be affected.
To look---guessing a older projection set and a model number would help-----the older ones front speaker grill comes off and an inspection plate behind it----necks of the 3 tubes will be pointed down with a board on each-----just look (do not touch) to see none are down or loose.
More commonly on some models they develop a problem where the filament voltage for the tubes is down and the picture gradually gets darker------have the lens(again a older set) been cleaned or not?
Remove rear cover with set unplugged and inspect the 3 large lens--if dusty clean with lens cloth---they are the light source and if dirty picture on these sets will be darker and dull looking
best answer possible with no model number given.
Posted on Dec 03, 2012
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Posted on Jan 02, 2017
the last hitachi that had this problem i fixed it bad finding bad solder conenctions throughout the board that the convergance ic's are on, also i foind some on the two main board in my repair. hopefully resoldering the convergance foard will fix the jitter or jumping around problem. if the picture is too red you can also try turning down the screen control slightly. good luck
Posted on Jan 03, 2007
it's not the crt's themselves but more like the anode line coming from the crt. This will need to be taken out of their sockets and cleaned the metal tips on each. Yes it has high voltage in this area. So unplug and discharge whole set and still be careful.
Posted on Dec 27, 2007
is the convergence off?
bad convergence amp ic's
Posted on Jan 07, 2008
Most projections have a removable speaker cover on the front under the screen. Then there is an access panel that you remove the CRT sockets are the circuit boards attached to the CRTs
Posted on Jan 22, 2008
SOURCE: Hitachi 50ux53k
Good Day, egipson;
When the CRT's Coolant (fluid) get onto PCB's, one can clean the boards with acetone. BUT YOU MUST MAKE SURE ALL POWER IS REMOVED FROM TV. SAFETY FIRST.
Good Luck, big IRISH. PS after cleaning [place heavy plastic over effected areas.
Posted on Sep 01, 2008
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