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TV shuts down with bright picture or when brightness is turned up: Note that if you are touching the little board on the neck of the CRT, you may want to discharge the HV datazheet if you are not disconnecting the fat red wire – the focus and screen G2 voltages on that board are derived from the CRT HV.
2SC3346 Datasheet PDF
These circuits provide the waveforms needed to sweep the electron beam in the CRT across and back some 15, times per second for NTSC. Again, always double check with a reliable voltmeter! Newer Sony monitors have this don’t know about TVs – a most wonderful addition.
If you really cannot live with it, make sure you mark everything verycarefully so you can get back to your current state. If you find one bad part, still check everything else as more than one partmay fail and just replacing one may cause it to fail again. Clean the screen with a soft cloth just dampenedwith water and at most, mild detergent. Always use an isolation transformer, whatever kind of design is used in theequipment you are troubleshooting.
Are you a perfectionist? Old TV requires warmup period: Also, see the section: However, repeat a few times to be sure. A set of rectifiers – usually in a bridge configuration – to turn the AC into DC. Assuming it is good, measure the voltage on the collector-emitter of the HOT this is safe if there is no deflection.
Toshiba 2SC Datasheet.
However, most of the time, damage is minimal or at least easily repaired. With TVs, the main filter capacitor is nearly always on the mainboard. Bad purity datssheet in mottled or incorrect colors. However, they do not fail often. The danger is probably more in the collateral damage when you jump ripping flesh and smashing your head against the ceiling.
Resist the impulse for being neat and tidy until you knowexactly datasjeet you are doing. Depending on the particular model TV, the following purity adjustmentprocedure may substitute green for red depending on the arrangement of theguns in the CRT. Depending on the power rating of the equipment, these wattages may need to beincreased. However, in this case, there should be some indication that the deflection and HV is attempting to come up datashset momentary whine, static on the screen, etc.
Content will continue to be the biggest problem. You are going to need to figure part of this out as I no longer have theschematics available.
The use of a series load will prevent your expensive replacement part like a horizontal output transistor from blowing if there is still some fault in the circuit you have failed to locate.
A colorbalance problem in this case means either a failure of this circuitry or a CRTwhere the emission from the 3 cathodes is so unbalanced usually due to onebeing dataxheet much weaker than the others that compensation is datwsheet possible.
The horizontal sync pulse from the sync separator locks the horizontal deflection to the video signal.
If the builtin degaussing circuits dstasheet no effect, use an external manual degaussing coil. You do not need a fancy instrument. Well, now you know! If the bulb lights at full brightness, youknow there is still a major fault. It is amazing how much we ignore unless it is brought to our attention.
If theresistance checks out, replace the fuse and try powering 2wc3346 TV. Static convergence sets the beams to be coincident in the exact center ofthe screen.
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There is no possible protectionagainst a direct strike. You could end up a lot worse. You don’t need to buy a fancy combination unit.
If scan timeis too long, current continues to increase. Since you probably do notknow what orientation will eventually be used, this is the best compromiseas the earth’s magnetic field will be aligned mostly across the CRT. If wiggling the cord has an effect,then the following are likely causes: Sometimes, just letting the problembounce around in your head will lead to a different more successfulapproach or solution.
If the TV then starts and runs once this signal is removed, the diagnosis is confirmed. The ohmmeter reading should be fairly high – well certainly notless than ohms – in at least one direction. However, for most dramatic impact, a darkened environment may bepreferred.
The best location willalso be relatively dust free and allow you to suspend your troubleshootingto eat or sleep or think without having to pile everything into a cardboardbox for storage.
Rather, the most common problemswill be addressed and enough basic principles of operation will be providedto enable you to narrow the problem down and likely determine a course ofaction for repair.