No picture 42PC3

[paulstef]

Hi,

is there any manual (training or similar) that gives more information than the useless service manual??

The hybrid module on the Z-sustain was defective, repaired it. Still no picture.

VS and VA are ok and get to the Y sustain board. The hybrid module on the Y board seems to be ok, no direct shorts are measurable.
There was one FET shorted, replaced it, nothing changes, it doesn't blow again either. There is humming noise coming from the board... Don't really know how to proceed.

[TVRepairNoobie]

Re: No picture 42PC3



PDF file is too large to upload, sorry.

[paulstef]

Re: No picture 42PC3

Hth

???

[TVRepairNoobie]

Re: No picture 42PC3

http://www.toms-service-manuals.com/...&Search=Submit

[paulstef]

Re: No picture 42PC3

PDF file is too large to upload, sorry.

This is the service manual, There are next to no informations about the sustain boards. I'd need a training manual maybe (or even better a schematic)

[ReeceyBurger123]

Re: No picture 42PC3

Going to sound dumb have you replaced or checked the fuses on Y and Z ?

[paulstef]

Re: No picture 42PC3

http://www.toms-service-manuals.com/...&Search=Submit

That's a good link, thanks, unfortunately the problem is not on the power supply...

[paulstef]

Re: No picture 42PC3

Going to sound dumb have you replaced or checked the fuses on Y and Z ?

One fuse on the Z was open, all other fuses were ok. Z is repaired.
I can't see any other defective semiconductors on the Y.

I don't know what is supposed to be coming out exactly from the Y board to the buffers :-/ I have a scope to measure.

[ReeceyBurger123]

Re: No picture 42PC3

So did you replace the fuse lol ?

[ReeceyBurger123]

Re: No picture 42PC3

Also does the Zsus make a buzz noise.

[paulstef]

Re: No picture 42PC3

So did you replace the fuse lol ?

You know the answer :-D

Yes, everything makes nice buzzing noises, only I have no picture. I would need to know what to measure on the output of the Y-sustain...

[ReeceyBurger123]

Re: No picture 42PC3

I asked because some one here before found a blown fuse then not fucking replaced it hahaha Anyway does the screen glow in a dark room ?

[paulstef]

Re: No picture 42PC3

I asked because some one here before found a blown fuse then not fucking replaced it hahaha Anyway does the screen glow in a dark room ?

Haha, too funny.

No, there is no glow coming from the screen, it's completely off. The blown FET on the Y sustain makes me think there might be something else on this board....

[tom66]

Re: No picture 42PC3

If there is no -Vy and Vsc you will not get a glow, so check if these are present. Can be shorted Y-buffer, which will cause no glow.

[freakaftr8]

Re: No picture 42PC3

Also you replaced the IPM on the Z sustain did you check the fusible resistors that are located below that IPM.? I believe they're labeled 101 and they're black rectangular shape.

However you should still have a picture with a zsus completely disconnected will this be very dim in this proportion and kind of like tearing paper

[ReeceyBurger123]

Re: No picture 42PC3

Also you replaced the IPM on the Z sustain did you check the fusible resistors that are located below that IPM.? I believe they're labeled 101 and they're black rectangular shape.

However you should still have a picture with a zsus completely disconnected will this be very dim in this proportion and kind of like tearing paper

Not true Ive had a failed Zsus with blown fuse and Ipm, Vs & Va all good cause no image at all.

[paulstef]

Re: No picture 42PC3

I will check the proposed items in the evening, thanks.

[freakaftr8]

Re: No picture 42PC3

Not true Ive had a failed Zsus with blown fuse and Ipm, Vs & Va all good cause no image at all.

Now that I think about it you're probably right I'm thinking about the PC50 1to5d 50 inch model I believe that one will show a picture with no z

[ReeceyBurger123]

Re: No picture 42PC3

Now that I think about it you're probably right I'm thinking about the PC50 1to5d 50 inch model I believe that one will show a picture with nosey says

[paulstef]

Re: No picture 42PC3

If there is no -Vy and Vsc you will not get a glow, so check if these are present. Can be shorted Y-buffer, which will cause no glow.

I get VSC constant 110VDC and -VY goes on and off all the time 0V/5V. Like half a second on then off and so on. There seems to be a problem with this voltage.

Is it save to disconnect the Y-buffer from the Y sustain and turn the TV on?