Hi every one!
I bought a second hand toshiba tv from an ebayer, and he didn't tell me about a problem in it. The screen went blue and some one who is involved in the electronics told me to replace the "ZP81" and the "iC670". Now in order to know what are these two components, I need the manufacturer guide. Can any one tell me what those two parts are? Thanks in advance

Somebody here might be able to help you but you are in the wrong place. We ain't TV repair people.

That said I do have experience along those lines when people used to have TVs fixed. Now they throw them away when they go bad or in your case sell them to some sucker on ebay.

I see that you are in the UK so any service literature indexes here in the US would not list the service manual your set. We do have a few people here from the UK, perhaps they can assist you.

-Hal

I think the general rule is, if you can pick up a TV you should throw it away when it breaks. It might make some sense to fix a "big screen" but the parts for table top TVs are largely made from "unobtanium".
These guys used to handle some high volume TV parts but the last time I was looking for something (a tuner for a big screen) they didn't have it. http://www.mcmelectronics.com/mcm4u.html

The first thing you need to do is to get the service literature for the set. The old-time standby would be the Photofact folder, published by H.W. Sams:
http://www.samswebsite.com/photofact/pf_search.asp

Another alternative is a pay-for-download from:
http://www.tvdiagrams.com

For either alternative you will need the model and/or chassis number.

Once you have the schematic and parts list, you should be able to identify the recommended parts. The numbers you gave are not part numbers, but sound like component designations on the circuit board. In order to know what they really are, you need the information specific to your set.

I used to work in TV shops many years ago, and I will second what was said about chucking the sets when they crap out nowadays. Just about everything in a modern TV is manufacturer-specific, and priced accordingly. Coupled with the low prices of a new set, repairing the things rarely makes economic sense unless it is a single, easily diagnosed failure (rare in the age of switching power supplies and microcontrollers).

[This message has been edited by NJwirenut (edited 10-10-2005).]

The old-time standby would be the Photofact folder, published by H.W. Sams...

I could have told him that too but he lives in the UK and TV's are different there. I don't think Sams covers models sold outside the US.

-Hal

I'm not familiar with the model (I'm more into vintage TV), but a quick search reveals that it's a pretty standard sort of 29" set. and that a blue screen accompanied by no response from the controls is a fairly stock fault.

The references ZP81 and IC607 refer to the identification numbers of parts on the circuit board and schematic diagrams, not the actual component numbers themselves. To get the latter you would need to either obtain a service manual or locate those parts in the set.

Unfortunately, obtaining service literature for many modern sets is very time-consuming and expensive, and sometimes pretty much impossible. As others have mentioned, it's why so much of this equipment has become "throwaway" these days.


P.S. Hal's right about Sams. The photofacts service guides are unknown here (except to anyone involved with American equipment, of course).


[This message has been edited by pauluk (edited 10-12-2005).]

blue screen accompanied by no response from the controls is a fairly stock fault

Yes because it is usually caused by a loss of the video signal. LOTS of things can cause that and unless it's a known problem caused by these two components simply saying change them is a shot in the dark.

-Hal

Yes, the two components mentioned are listed as a common fault for this particular model apparently -- Sorry if I didn't make that clear.

As Hal says though, unless you have the means and knowledge to test the circuit, replacing parts in the hope that it cures the fault is still the shotgun school of repair.

The down side of simply throwing parts blindly at a problem is you can end up with 3 legs chewed off and still be in the trap.

Personally tbtkdz,
I wouldn't get mucking around inside a modern TV set.
They run at half-mains voltage these days, on the chassis itself, the un-wary can get a very nasty surprise, not to mention the risk of the EHT (14kV+) side of things!.
My advice would be take it to a TV repair person, they are in the "know" and can locate the fault simply and a lot quicker than what you possibly could, they have a lot of specialised test gear for this sort of thing.
I guess it's just one more reason why I'd never buy a thing like that without seeing it operating properly before I handed over the cash.
Just my $0.02 worth.

Going off on a tangent somewhat, but in the old tube/valve sets the line boost probably presented a somewhat greater hazard -- Anything between about 500 and 1000V but able to deliver a current many times greater than that available from the high-impedance EHT supply.

Mind you, some of those old vintage sets which derived their EHT direct from a mains transformer instead of the LOPT could be absolutely lethal!




[This message has been edited by pauluk (edited 10-28-2005).]

I used to be able to get Sam's Photofacts at my local library in Cleveland, Ohiu, USA. That saved me alot of money fixing TVs, stereos, Et,c. You could easily spend 20+ USD acquiring the technical docs for you set. The high voltage on my 27" Panasonic is spec'd from 26-28KV. Your 29" set is most likely higher. Are you aware that you can discharge the CRT and put the set aside and still get zapped by many thousands of volts when you come back to it with the new parts. (If you don't leave it shorted or discharge it again.) It probably won't kill you but consider filing a flight plan before taking off. I have no clue what those parts are but some form of alignmet might be required after you replace them. Many of the sets today have secret service modes that are only described in the technical docs. Why don't you just ask "some one who is involved in the electronics", how much they want to do it for you?
Joe