Re: Sansui HDLCD3210B Starts, loses picture
Hi folks,
Here are pictures of the two boards in question. I hope everyone had a great Christmas!
I'll let you know if there is any image viewable in a dark room with a flashlight once I reassemble and test the TV again in a few minutes. Also, the "please wait" duration.
Thanks.
David...
Overlord500
Member
Last Activity: 12-27-2013, 10:39 AM
Joined: 11-09-2013
Location: Wallingford, VT
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Re: Proscan PLDED3996A Won't Start... Some done, what next?
Thanks for the response. My father is getting me a digital multi-meter for Christmas - he always is looking for gift ideas. I did some work on that TV - it does produce the correct image on the LCD, seen with backlighting provided by a flashlight. Just the LED's are not lighting up. I took that apart, too, and am curious how to test the "light bars" individually. Looks like they are wired in series, so if one LED has failed, the TV will not produce backlighting. The voltage going to the backlighting was 64 volts....Leave a comment:
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Sansui HDLCD3210B Starts, loses picture
Hi folks,
I'm hoping someone can help. Was given a TV to try to fix for a local business (who has been great to my family, the school where I work, etc). TV turns on, gives a "please wait message" on the screen, and then goes black. When hooked to a VCR, with the right input selected, it will play sound and acts like it is working. LED on the front goes from red to green when turned on and stays green even without the picture.
Here's the interesting part. I already replaced the combined ac inverter/backlight inverter board with one off ebay that claims to have... -
Re: Proscan PLDED3996A Won't Start... Some done, what next?
In thinking about this, is it safe to assume that the voltage listed on the capacitor should be the voltage running across the capacitor? If so, I could check all of them with the TV turned on and see what I get at each capacitor.
Also, would it be useful to try hooking up a VCR or another video source to the TV to see if I have sound? Just an idea.
I hope everyone had a great Thanksgiving!
Thanks.
David...Leave a comment:
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Re: Proscan PLDED3996A Won't Start... Some done, what next?
Yeah, it's really odd, I agree. Yep, these are original boards as I broke the "seal" when I cracked the case for the first time - killing the warranty, which was past anyway.
Looks like the power board and the main board are designed to also support a version of the set with a built in DVD player, but this board/set doesn't have this feature. Perhaps this might explain the discrepancy in the labels.
Thanks.
David...Leave a comment:
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Re: Proscan PLDED3996A Won't Start... Some done, what next?
Well, I have an analog meter. Set it to the highest DC voltage supported - 300V. Pins the needle past 300 Volts. What should the voltage be here?
Thanks for your continuing help and support.
David...Leave a comment:
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Re: Proscan PLDED3996A Won't Start... Some done, what next?
Looks like the output voltages are correct based on the PS board - 12volt (as labelled) and 5 volt (as labelled). I tested all grounds, too. The wires that run to the video board where that board says 24volt are labelled 12 on the output side, so perhaps this is a mislabel on the video board?
The one thing I'm not sure I understand is the red and black two wire output (at connector CN2) - which is 55volts. The way the picture of the PS board is, this connector would be on the top left. It...Leave a comment:
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Re: Proscan PLDED3996A Won't Start... Some done, what next?
Hi folks, I tested the diodes that splitcrete asked about. As far as I can tell, they're fine. Using an analog meter, they have infinite resistance one way, and consistent resistance the other way - between 10 and 30 ohms.
I did order the 3 capacitors I didn't replace yet. I will keep you all posted.
Any thoughts on how to test the transformers or what I think is the relay (directly above the power supply connector on the power board)?
Thanks again.
DavidLeave a comment:
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Re: Proscan PLDED3996A Won't Start... Some done, what next?
Ahhh... I understand. I'll let you know in a moment. For a bit there, I was pretty confused
DavidLeave a comment:
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Re: Proscan PLDED3996A Won't Start... Some done, what next?
I didn't circle and mark these diodes... ?
DavidLeave a comment:
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Re: Proscan PLDED3996A Won't Start... Some done, what next?
Hi,
I did label 3 components on the board, other than the caps I didn't replace. Perhaps I'm mistaken, but they are transformers not diodes. (?) I labelled them in case others had found them to be problematic on other sets.
In regards to the voltage question - there are many leads running to the mainboard with many voltages. The only ones that were labelled that had a significant discrepency are the two that should be 24 (as marked on the board) but are reading 12. Some of the voltages should be 6...Leave a comment:
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Proscan PLDED3996A Won't Start... Some done, what next?
Hi folks,
I'm hoping you can help with this TV. It was given to me, broken. When plugged in, it gives a red light in the corner. When the power button is pushed, the light turns blue, but nothing else happens. No sound, no dull image, nothing. The screen has no damage, as far as I can tell. Of note, I've never tried to hook up a device to the TV... seems unnecessary, but perhaps it needs a signal coming in to power up?
Anyway...
I've already replaced most of the capacitors on the power board, with the exception of 4 (the "big one", and 2x 470mf 16v, 1x 220mf,... -
Re: New Members - please post your introductions here
Oh yeah... I'm David I forgot to post my name. From the Eastern US in the great state of Vermont.
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Re: New Members - please post your introductions here
Hi there...
Well, I have to say that I've used posts on this site for a while now - so why not join in? A little about me? Well, I've loved to tinker with electronics since ... well, at least since I was little. I used to desolder components of discarded electronics, scavenge discarded computers at the local dump, etc... Today, I am still an avid scavenger of electronics with some repair skills. I love to tinker and do things myself from cars to computers to electronics. I've replaced parts and resurrected many LCD monitors,...Leave a comment:
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