Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
It seems strange tho that Vs and Va were at-spec within a volt or so, and I adjusted them to under a quarter-volt error.
I did check the DMM on my car battery, on a few AA batteries, and wall AC voltage. All seemed reasonable.
Do those values for Vy and Vsc seem right? Am I reading the panel sticker correctly? Vy=-200 and Vsc=120 ?
I guess maybe at higher voltage my DMM could be breaking down. Its a Fluke 867B Graphical ScopeMeter....
ngc1068
Member
Last Activity: 08-13-2013, 08:30 PM
Joined: 08-04-2013
Location: Houston, Texas
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
Wierd.
I adjusted Vs and Va per the specs on the panel, they were off maybe 0.5V and 1.5v respectively.
Then the label on my panel shows Vy of -200 and Vsc of 120, right?
The values on my Ysus board were quite a bit lower than this (stupid me didn't even record the as-found values...)
So I adjusted them per instructions to within 0.25V of -200 and 120, with the TV in "white".
Well, got around to the front and found the panel...Leave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
Does mal discharge ever get better from making adjustments alone? Is it possible it is simply an adjustment issue?Last edited by ngc1068; 08-11-2013, 11:25 AM.Leave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
Is there a detailed guide on adjusting the voltages before I remove the board for mailing to ya?Leave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
So just to be sure, here's a closeup video I took of the TV bottom right corner, showing the red snow. Is this what "mal discharge" looks like? Also, the density of the red pixels changes, depending on what is on the screen, but it doesn't appear to change as the TV warms up. Its there the first time you turn it on, and its there no matter how long the TV is on, doesn't get better or worse.
[url]http://www.modschat.com/IMG_3539.MOV[/url]
I also...Leave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
Firmware ya think? but it didnt have this problem before the failure last week...
I kinda did a crappy job on replacing the FET. I have a broken left wrist, so wife was pulling up the FET as I heated the heat-sink solder, she's a big strong German girl, she peeled the pad off the board with the FET before the solder melted I put the terminals back down on the new FET, but I bet the heatsink it marginally useful, its not staying down. Is the FET heatsink an active terminal...Last edited by ngc1068; 08-10-2013, 02:53 PM.Leave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
No, i had ordered a complete new bottom board, so I had my old one. I robbed one good FET from it and replaced the one bad one on the top board....Last edited by ngc1068; 08-10-2013, 02:44 PM.Leave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
a few red sparkles all over the screen tho...hrmnLeave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
yay, that did it!!!! its fixed!Leave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
yeah, top most FET on upper is badLeave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
maybe i can rob a good FET from my old lower board and replace a bad one on the upper?Leave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
oh wait, the upper drv board ohms are low today, 88.3ohms and 77.6. bad FET on upper?Leave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
ya, thats where im measuring....do u have skype? lolLeave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
no, infinite one way, 2.4megohm the other wayLeave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
I disconnected just the top YDRV and i get the same screen with top blacked out.Leave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
Hmmm...
I disconnected the ydrv bottom, and I get the same display as above, only the bottom half is black. Also the ohms of the FETs on the new board match the upper y-drv board.
Ldmme guess? I got sold a bad ysus board?Leave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
Hmmm...
I purchased a YSUS and YDRVBT board and installed them today.
Unfortunately, it didn't solve the all problems.
Now I have bright blue sparkling pixels all over the screen, with this white vertical stripe that moves to different positions left to right every so often.
Ya think I got a bad YDRV board?...Leave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
Upon removing and inspecting, it definitely looks like some heat on Y-SUS around the upper IPM, clear residue and discoloration, around the ER_LOW pin area and the C5, C6, C24 area.
Not clear to me how to remove the IPM heatsinks, do you have to unsolder the IPM from the rear and get it off the board to remove the sink? There are screws that are holding the sink on that appear otherwise inaccessible.Leave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
If it was your TV, and you had the money to spare, would it be worth repairing?Leave a comment:
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Re: HP 50" Plasma TV, Model: CPTOH-0603... plz, need help troubleshooting
Its holding 111.4VDCLeave a comment:
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