Question about Hitachi Standard (CRT) Televisions
Hitachi TV - model C2586TN. When switched on from standby, sound comes on virtually immediately, but picture takes 3-4 minutes to appear.
However, channel numbers show on screen immediately.
Suspect this may be related to another problem recently encountered and fixed - missing green colour, caused by dry joint on CRT neck circuit.
The cause is one or more shorted transistors either on CRT board or on main or both. The colors are red,blue and green, you have a transistor for each and a bias trans. check each there are 6 in all.
Posted on Sep 14, 2007
SOURCE: Television reverting to standby
Try adjusting A1 on loptx it is very critical & can cause the symptoms you are describing.
You could be right in saying the crt, Philips tubes are notorius for failing.
Im hoping your a tv tech if you are not DO Not do what I have written below tapping neck to hard can cause seriouse injury to your self.
Run set & tap the glass neck of crt if pic flickers or you see red blue or green flashing while tapping tube neck it will be the tube.
Let me know results there are a few things that can be done.
Posted on Dec 15, 2007
Sure this is tough one as the model is old. But when the red light flashes the set is powering up and the line output transformer is bringing up the voltage to the CRT stages. The time delay is the decay of the voltage to the circuits mainly due to aging of the components--maybe capacitors- or a possible section of the video-Y board having a series of DRY soldering.
Now you can attempt to see to these issue to evaluate.
First of all one you are confirmed that only when the set warms up the picture starts to come in, then we can simulate the fault by using a hair dryer to warm the suspected parts, mainly try on the section of the Y amp IC and the LOT section.
Checck for a faulty 22mfd or 10mfd with 25o volts capacitor on the LOT secondary to the CRT to be faulty, replace.
This can cause delay and poor picture quality.
Also if the contrast section of the Y amp is faulty you may get this faded situation of picture and colour.
Next use a good soldering iron to touch up the soldering of the
Y/C amp. This can be having poor joints and can be a possible suspect too.
The final part can be the picture tube itself but the fading would have very gradual and with a particular tint in domination.
I hope the tips can get you to work and find a solution.
The Tv is a good one and if the set works it can still give more hours of use.
Posted on Aug 31, 2010
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