Re: Help with Sharp TV - LED driver board etc...
Yes, usually it is: plug in the power cord while holding the VOL-DOWN and INPUT at the same time. Or in some cases, hold the POWER button while plugging in the power cord. In my case, I could tell that the TV was trying to come on, twice each time, but nothing = and in the end it would just come up with the same blinking pattern 2-5 which is "no 12V supply" code.
Now, it seems that in some other cases, that same code can actually be produced by a faulty mainboard, so that's why I started from...
petervfx
Member
Last Activity: 09-27-2015, 08:45 PM
Joined: 08-23-2015
Location: Los Angeles, CA
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Re: Help with Sharp TV - LED driver board etc...
AND FINAL UPDATE:
The TV is working!
OK, so here is the scoop:
Assuming that the problem was maybe the main board, I replaced that first, few weeks ago. That made no difference. Then I replaced the t-con board, and that made no difference. Then, I replaced the PS board (should have done that first, but they are hard to find and these other two I found for a good price) and the TV came ON, but with no back light.
When I was removing the original mainboard, it got a little...Leave a comment:
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Re: Help with Sharp TV - LED driver board etc...
UPDATE:
Since I replaced the power supply board with a refurbished one, the TV does not display any error messages (it used have 2-5 error, pointing to 12V PS problem) . But, even though the LCD does work, and there is a picture and sound, the picture can only be seen with a strong flashlight pointed at the screen. This means that the backlight does not work. I also checked the screen in complete darkness to make sure and there is absolutely nothing coming from the backlight, not even a brief flash or any light leaks...Last edited by petervfx; 09-27-2015, 02:25 PM.Leave a comment:
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Re: Help with Sharp TV - LED driver board etc...
Ok, got it
So surface mount components are THAT hard to repair? I was fantasizing about just putting a touch of solder there and fixing it that way - would that not work?
Thanks for the suggestion, I may try that. I was thinking of also finding out where I could measure the voltage going from the PS to the LEDs, as there are two cables... I am thinking that perhaps the "new" (probably repaired as it had scuff marks and such), PS board may be defective and since power to LEDs goes straight...Leave a comment:
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Re: Help with Sharp TV - LED driver board etc...
Yes, that's what I did, although it did not seem to be necessary - as soon as I changed the PS board, the 2-5 code went away and the TV was back to normal operation, except - no backlight. I got the code from the service manual.
I will check for that today and will let you know what I find out. But considering it starts up normally, I have doubts...
The problem started as the 2-5 code (no 12V). I tried resetting the TV with the VOL- and INPUT while plugging...Leave a comment:
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Re: Help with Sharp TV - LED driver board etc...
I just glimpsed to it, but two things are important: I already tried soft reset with VOL down and INPUT button; I tried some others too (like holding power while plugging it in) and nothing.
The problem is actually not that I have a code any more. Since I replaced the power baord I have no codes. The TV comes on normally as it should, and I can turn it on and off. It behaves just as it should, with one little exception - the backlight does not come on. Other than that, it's all good.Leave a comment:
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Re: Help with Sharp TV - LED driver board etc...
I've checked all connectors and they are all as they should be, even the thin ribbon cables - I made sure they are seated properly in the little groove...
However, I have not taken any measurements yet. I am not very experienced in these matters, and am afraid of shorting something. But may try when I feel more adventurous.
Budm, [U]yes that's exactly the power board![/U] I replaced it with a "new" one, which was hard to find, from a TV repair store in Canada. Other boards were also bought from...Leave a comment:
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Re: Help with Sharp TV - LED driver board etc...
The plot thickens:
I just realized that my model of the TV does NOT have a LED control board!? I am looking at the service manual overall wiring diagram, and model 633 has an LED ctrl board, but model 632 does not.
Any ideas what is wrong here? I would hope that the old broken PS board did not burn all LEDs, that would quite a feat... there are hundreds of them as it is a full array TV...Leave a comment:
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Help with Sharp TV - LED driver board etc...
Hi there, first time here so be gentle (long time lurker though)
I am not highly skilled in these matters - I only put my own computers together and did one very basic soldering job for my car. Probably don't need to solder for this thing anyway.
My 70" [B]Sharp TV LC-70LE632U[/B] developed a problem after I went on a trip and disconnected power to my TV for seven days. Upon return, the TV would not power on, only 2-5 code (12V PS problem).
After changing all boards (t-con, main board, PS board in that order), I got rid of the code, and TV comes on, has...Last edited by petervfx; 09-19-2015, 09:09 PM. -
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Absolutely wonderful site guys! Newb here all the way though, so be gentle
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