If this is bad, you will know it when you touch it- it will fall apart, or at least the disk will move. If you do the work, the part is about 5 bucks, otherwise, a shop will be around 100 dollars.
2: The condition of the Horizontal Output Transistor- If it has an integral damper diode, the only way to test this is by swapping with a new one. If it does not have an integral damper diode, you can check for excessive leakage, or open condition with a simple VOM. Take the transistor out of of the circuit, and check resistance between lead, and between each lead and the case (if it is not a plastic unit), and reverse the leads after you have a value from the first test. One way should be a high, (or moderate resistance), and the reverse of those lead position should give a very low resistance. (or low then high). If the resistance is the same either way, or infinite both ways, that transistor is most likely the culprit.
Part can run from a few dollars to about 30 dollars.
If you are just going to bring it to a shop, compare the cost of a new set to an approximate 100 to 150 dollar bill (on average). Also keep in mind the FCC broadcasting standards will change in a few years to strictly digital modes of transmission.
:Turned on my Toshiba 27 inch tv. Will not come on, can hear it click when turned on and off. Found a 5 amp fuse which was good . Is there another. Set was built in 1994. Is it worth fixing ? Any help appreciated.
Richard:
How about the Full model # of the set so it can be specifically researched. As per John's info on the
Hoz out xstr being shorted that would be the first thing to check. Also if you're typically not hearing the HV come up on the pic tube ...therefore no large pulse present on the HO xstr...... it would be safe to take a quick check for B+ on the collector of that Xstr to cold gnd to see if it is present and to see if it is regulated down. Not knowing your specific
model but typically the PS area ,viewed from the rear
of the chassis is the area just above the left center
quadrant of the chassis. A frequent problem on Tosh is
a 100 ufd elect~6v DC rating that is almost right near
a TO-220 cased 4 leaded regulator.....notice I said 4
leads not the usual 3 leaded ...3 term reg....so that should make it easy to locate. So since you hear a relay clicking , at leasd the stand by PS circuitry is working. The specified PTC thermistor shud be of no consequence to your problem as its associated with your degaussing circuitry. Now back in older designs
when a NTC therm in series with the power input circuitry.......that's a different story. RSVP
Edd W
:Turned on my Toshiba 27 inch tv. Will not come on, can hear it click when turned on and off. Found a 5 amp fuse which was good . Is there another. Set was built in 1994. Is it worth fixing ? Any help appreciated.
And without question, some sets of the same design have the same faults and fail the same way.
But one cannot just assume that all set failures in a specific model are just that one specific item that may plague that model line (sometimes it is). This is not to say that of 1000 sets serviced, that of that particular 1000 sets that one failure may account for all of them (sometimes it does). But in a given 1000 set failures, there are usually a few where it is more than just that one item- Especially after a decade of use. If they do only repair that one plague item, and not check anything else they see a fair number of customer returns for pretty much the same thing, or worse- lose customers because it was more than just that one design flaw. I know it is difficult to explain to someone that other parts had to be replaced also merely for the sake of reliability/reputation.
One thing on the PTC resistors- They are a safety component, which is not widely published, and if the owner of the set smokes, or someone in the household smokes (especially chain smokers- These can, and do fail. Checking them is as easy as touching them, because when they fail, they fall apart, and no special equipment is needed for checking that.
When PTC resistors fail or are failing, sets can behave strangely, and not consistently between sets of the same model even. When the disk fails to have a lead making contact with even one side- the sets fail to work, even though for practical purposes it is in just the degaussing circuit. I have encountered a number of sets where something was spilled on them/in them, and the PTC was what failed.
But regardless of all of this: The nub of the matter is whether or not to pay about 100 dollars, or even fifty dollars to have someone fix a set that is a decade old, when new 27 inch sets can be had for less than 200 dollars that have more features than a decade old set had. Especially inlight of the fact of the pending conversion of transmission modes going digital.
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:Richard:
:How about the Full model # of the set so it can be specifically researched. As per John's info on the
:Hoz out xstr being shorted that would be the first thing to check. Also if you're typically not hearing the HV come up on the pic tube ...therefore no large pulse present on the HO xstr...... it would be safe to take a quick check for B+ on the collector of that Xstr to cold gnd to see if it is present and to see if it is regulated down. Not knowing your specific
:model but typically the PS area ,viewed from the rear
:of the chassis is the area just above the left center
:quadrant of the chassis. A frequent problem on Tosh is
:a 100 ufd elect~6v DC rating that is almost right near
:a TO-220 cased 4 leaded regulator.....notice I said 4
:leads not the usual 3 leaded ...3 term reg....so that should make it easy to locate. So since you hear a relay clicking , at leasd the stand by PS circuitry is working. The specified PTC thermistor shud be of no consequence to your problem as its associated with your degaussing circuitry. Now back in older designs
:when a NTC therm in series with the power input circuitry.......that's a different story. RSVP
:Edd W
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::Turned on my Toshiba 27 inch tv. Will not come on, can hear it click when turned on and off. Found a 5 amp fuse which was good . Is there another. Set was built in 1994. Is it worth fixing ? Any help appreciated.