Question about Televison & Video
Has sound but no picture,plz help if you can
Its a pretty good set, If no brightness on screen I suspect you will find either the three tubes are not firing up (lit) or it has no high voltage and there are not too many things a do it yourself person can do unless they have a volt meter and know how to check voltages and resistance.
This model does have a light box which means all the working part of the set less the speakers can be removed--called a box as it looks like one when removed.
Most of these have convergence problems which will either result in a dead set with blinking power light or a 3d picture.
It is possible it has a short in the sweep circuit but that also triggers shutdown and the power light blinking.
About the only simple (not real simple) thing might be the voltage for the filaments in the 3 tubes may be missing, If high voltage was present and those not lit it could cause your problem.
In addition the set like most is well protected, if no vertical or horizontal sweep is detected the set blanks (turns off) the 3 picture tubes to prevent them from instantly burning the mark into the face or screen of the tube.
What I am saying is there are several possible reasons all of which require some skill to find much less fix.
Either (unless we have a tech in the family) time for a shop or time to retire the set and go shopping.
Posted on Dec 12, 2012
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Posted on Jan 02, 2017
well take the back off on the transformer should be two adj. pot screen control on top focus on bottom normally try to turn up screen control good luck
Posted on Apr 03, 2009
Power supply capacitor is usually suspected.
Read below and decide if you want to tackle the problem yourself if so I’ll help along the way with what info I have. If not contact the nearest repair shop armed with the info below.
A dead set (no picture no sound) can indicate any number of problems – Usually the set is in shutdown or protection mode – this means that the internal circuits have detected a problem with a supply voltage missing, drawing too much current, going over voltage or a short condition.
The first thing to do is power off the set unplug it for 5min. than replug and try again. This in effect resets the main micro and will sometime unlatch a fault and resume working. There are certain common problems based on the make model – for instance convergence output IC’s(CRT projection TV’s) can cause a dead set symptom in many models. Vertical output IC failure can also cause the same symptom (CRT standard and Projection).
The only way to determine the real cause is :
By an educated guess based on experience or by directly troubleshooting the set – checking fuses, measuring voltages and checking for shorts. Many of the intermittent problems such as, int.(Intermittent) no sound or picture, int. picture shrunken or misshaped. These problems are generally due to cold (bad) solder joints (all TV’s and electronics) that break down under slight temperature changes or vibration and are usually verified by physically tapping the suspected area on the circuit board, or by quickly heating or cooling a suspected component or area ( cold spray and hot air gun). The other main culprit is leaky or dried out capacitors or capacitors that change value depending on temperature. These can sometimes be seen as bulged or leaky and have an acrid odour. Be sure to vote/rate me if this helped Thanks!
Posted on Oct 17, 2009
It's been my experience that symptoms that point to the power supply, generally are not the case. Schematics now days are tough to find unless you are an authorized servicer for that brand. There are a couple of generic dealers out there but they don't carry everything. Before you replace the power supply I would suggest you go though other boards first looking for bad solder connections and/or transistors and IC's that may be defective. A good DVM with an ohm's scale should suffice. If you still can't find anything, I would suggest taking it to a reputable repair person.
Posted on Feb 25, 2010
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