Hitachi 57SWX20B-- No picture

[grungerokker13]

Problem: 57inch Hitachi 57SWX20B tv powers on but I get no picture.

I can hear it power up and it "sounds" like a tv getting ready to come on with the clicks and the power supply booting up but the screen never comes up. I can hear it running and all the leds light up but it never gives a picture.

I opened it up and I can see that no lights are coming out of the red/yellow/blue magnifying lights (i'm assuming that whole devise is the lamp).

I'm a novice with projection screen tv's but I'm good with electronics and I would be better with this if I had schematics to see how this actually worked.

My question is this: is this a bad cap somewhere (if so, how do I know where?) or is it a bad lamp or a bad projector?

Any help or suggestions is VERY much appreciated. If you need me to do any further troubleshooting and report back I will do so.

If nothing else, if someone could help explain exactly how these things function or give me a link to electronic schematic that would help too.


Thanks

[Krankshaft]

Re: Hitachi 57SWX20B-- No picture

Are the tube filaments lit? Look at the ends of the tubes you should see an orange glow.

Magnifying lights? Those are the red, green, and blue CRTs. I'm sorry but I'd recommend getting a book about TV service first.

RPTVs are alot more complicated than their direct view CRT cousins especially the video circuits.

There is a host of things that can cause no picture.

Off the top of my head shorted Horizontal Output Transistor, Bad Flyback (not supplying HV anode or filament voltages to tubes), bad Vertical Output IC (causing chassis shutdown or cutting CRT drive to save tubes from burnin).

[Toasty]

Re: Hitachi 57SWX20B-- No picture

Service manual:

http://www.eserviceinfo.com/download..._51SWX20B.html

Covers your model.

You will need WinRAR to put all the pieces together to make the PDF file.

[grungerokker13]

Re: Hitachi 57SWX20B-- No picture

Are the tube filaments lit? Look at the ends of the tubes you should see an orange glow.

Magnifying lights? Those are the red, green, and blue CRTs. I'm sorry but I'd recommend getting a book about TV service first.

RPTVs are alot more complicated than their direct view CRT cousins especially the video circuits.

There is a host of things that can cause no picture.

Off the top of my head shorted Horizontal Output Transistor, Bad Flyback (not supplying HV anode or filament voltages to tubes), bad Vertical Output IC (causing chassis shutdown or cutting CRT drive to save tubes from burnin).

Ok I downloaded the service manual so just give me a few hours to look through it and check the schematics and I'll get back. Thanks for the suggestions and thank you for your patience with a novice like me.

[grungerokker13]

Re: Hitachi 57SWX20B-- No picture

Ok I'm not seeing the filament tubes on the schematic are they located at the bottom of the crt's?

[grungerokker13]

Re: Hitachi 57SWX20B-- No picture

*bump*

There are no lights coming out of the crt's at all.