Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
When the zsus power connection is unplugged, the tv seems to stay powered up. Momentarily, I get this weird dim bar on the screen that goes away, but the front led still stays blue. The screen seems to be completely black after the bar goes out.
When I unplug the main cable going to the ysus, or when everything is plugged in, the tv cycles on/off. The front led cycles red to purple.
mh321
Member
Last Activity: 01-30-2014, 11:58 AM
Joined: 08-29-2013
Location: IL
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
The 2 fuses on ysus are still good. I can't find any fuse on zsus.Leave a comment:
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
There is no picture at all now after the pop. Is there anything I can try measuring with a multimeter to find out which board is bad? How can I tell that the zsus got taken out/ or will go out soon? I didn't see anything that looks visibly blown.
ThanksLeave a comment:
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
So I bought a new power board, and I connected it to the tv. The tv ran fine for about 30 minutes. I then heard a pop like something blew, and now there is no picture. All the tv does is the power board seems to cycle on and off, and I can hear a buzzing on the z-sus. Plugging the new power board or the old one makes no difference.
Here are the voltages:
VS: 5.3V peak, cycles from zero and ramps up to 5.3 before dropping to 0v.
VA: 0.5V peak
VY: 0.19V
ZBIAS: 0.13V
+5V: 4.9V...Leave a comment:
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
Thanks, I'll try looking at the prices for replacement boards for now, and if I find a good deal, I'll buy the board.Leave a comment:
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
Is it possible or worthwhile for me to find and replace the failing component(s) on the PSU to save money? How hard can this be?
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
any ideas?Leave a comment:
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
I checked and there is a slight temperature difference on the upper cooling fin on the y-sus when there is a picture and when there isn't. All of the cooling fins on both boards feel warm overall. The fins are all about 42C, but I don't have the right thermometer to measure the differences.Leave a comment:
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
It drops suddenly to 86VLeave a comment:
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
It reads 86v when the picture goes out. I tried the fan method you wrote and pointing it at the right lower corner of the power supply board (as in capkid's picture in previous post) keeps the tv on for quite some time. I tried it on the ysus, but it had no effect.
Without the fan pointed at this spot on the PSB, it takes around 5 min for it to go out from a cold start, and about 1-2 min for the picture to go out when already warm.
With the fan pointed at this area, I can keep the tv going...Leave a comment:
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
Anyone?Leave a comment:
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
Is the power supply board probably bad?Leave a comment:
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
I tried the cold spray and hair dryer method and it has no effect on when the picture goes out. I cannot make the picture reappear or make the picture go out using cold or heat. Is there anything else I can try or measure?
ThanksLeave a comment:
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
I got the compressed air now yesterday. So I just use quick 0.5 second bursts on all components one by one? Can the ice that this spray makes conduct electricity?Leave a comment:
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
Also, does anyone know of a service manual for this TV?Leave a comment:
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
Is the cold spray the same thing as an electronics duster sprayed with the can upside down?
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
Any ideas anyone?Leave a comment:
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
Is there anything else I can do or check to find out for sure what is wrong?
ThanksLeave a comment:
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
I think I measured it right this time:
-VYworking: 199.7 -VYblank: 199.6
I tried disconnecting the boards, but the VS keeps cycling from 0V to 197V about every 5 seconds.Leave a comment:
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Re: HP Plasma CPTOH-0603- Picture goes blank after a few minutes
Here are my findings:
VSworking: 197.7 VSblank: 87
VAworking: 60.9 VAblank: 60.8
VSCworking: 199 VSCblank: 199
-VYworking: 25 -VYblank: 12.6
VZBworking: 95 VZBblank: 78
So once VS stops giving out 197V, the picture disappears on the TV.
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