Re: SHARP LC-70LE735X will not turn on
anyone? haha
should i just remove the panel and check each led with higher current?
could anyone help in finding what leds i have inside?
much appreciated.
Ash
bl0wfish
Member
Last Activity: 08-13-2023, 03:26 AM
Joined: 06-26-2016
Location: Mildura VIC
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Re: SHARP LC-70LE735X will not turn on
me again guys. im close to having to take the panel off and check each backlight led. i couldnt find any backlights for my tv. my tester does 150ma. checked it with multimeter.
once i have a fully working 100% backlight. i will need to do a VOL INPUT reset to clear errors? never worked on a sharp. every time ive done a backlight, tv still worksLeave a comment:
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Re: SHARP LC-70LE735X will not turn on
Hey guys. Had this sitting off bench since last post. Been fixing a few other things around house. Before I proceed with removing lcd panel. I want to be certain its led diodes in the backlight strips.
Im using a good led tester. There's a large amount of strings behind this 70" panel and im consistently pulling 160v on each string. If we had some leds out. Wouldnt I notice this on front of screen in dark? And I'd have a noticeable difference in voltage on my tester?
This tester has always worked great in finding...Last edited by bl0wfish; 09-05-2021, 07:39 AM.Leave a comment:
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Re: SHARP LC-70LE735X will not turn on
i wouldnt have a clue with high and low voltages being error or not. i only shared BUDM post confirming High is good and Low is bad for another Sharp TV. yes i seen the screen display also. and yes i was getting 0v previously. was doing something wrong obviously. i did do the power on test different this time tho. im happy to swap led. and im confident in removing panel. done it alot of times. but i want to be sure. i wish it was simple and disable backlight or have it off so i could test the tv with torch method. i wouldnt...Leave a comment:
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Re: SHARP LC-70LE735X will not turn on
ok good sir, i did those tests.
Its way to hard capturing Backlight voltages :-(
so with power disconnected at AC and probing voltages on PIN22 ERROR
and the backlights.
i got the following with reset/force on via VOL- and INPUT whilst connecting AC (this is for all the below tests)
----
Both TCON 7001 and 7002 ribbon connected.
i get
[CODE]3.22v on PIN22 ERROR PFC hits 405v, LED strips hit around 150~v[/CODE]
power light goes green. led strips flash, green power led...Leave a comment:
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Re: SHARP LC-70LE735X will not turn on
yes i have all those files (i think) well at least the PSU SCH and PHOTOS, but not all of it makes sense to me. thats why i am here. yes i will get a photo of the back of unit with everything in place.
thanks guys for all the replies. i am so thankful...Leave a comment:
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Re: SHARP LC-70LE735X will not turn on
yes my last post i checked all pins. if no voltage was present. it wasnt posted.
i can do the force on again and triple check. just to confirm.
1k resistor each from BU5V to PS_ON, PNL_POW, DIMMER, OFL, STB ?
Yes i did try and catch the LED Voltages as they spiked, mentioned in post #1
then again in post #8
without an analogue meter its too hard to catch.
but i will persist and keep doing it and see what i get. we cant go off those figures...Leave a comment:
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Re: SHARP LC-70LE735X will not turn on
Arghhh, i see. i am not technically clever enough. but is there a way to bypass the led strips so i can power on the unit? then i can simply use a torch and see if the unit is doing anything?
this is what i used to test them whilst still under the panel
[url]https://www.shopjimmy.com/sid-gj2c-led-tv-backlight-tester/?utm_source=youtube&utm_medium=sid-gj2c-led&utm_campaign=sid-gj2c-led[/url]
Thanks for your time mate.
AshRe: SHARP LC-70LE735X will not turn ...<br /> <br />...Leave a comment:
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Re: SHARP LC-70LE735X will not turn on
Ok, so i started again in aid to hopefully get some more input on what the issue is with the TV.
With the TV all hooked up as normal with power on and in standby (i assume - as power LED flashes RED slowly)
i get the following voltages with a chassis, board ground
[CODE]5v on BU5V only.
5.5v on D7951 cathode, 0v anode.[/CODE]
The following caps on pos and neg legs
[CODE]C7800 ABC 325v
C7951 5.5v
C7121 0v
C7955 5v
C7728 0v
C7138 0v
C7133 14.9v[/CODE]
...Leave a comment:
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Re: SHARP LC-70LE735X will not turn on
Ok how would you suggest i do the sequence? What i did was have main board disconnected.
A lead from pd pin15 to breadboard. Then 5x 1k resistors to each pin. Which is pin 14 16 19 21 24. This gave me the flash and shut down of led.
The leds peaked around 200+v. But as I said its to fast to catch anything accurately. If I just run a 1k from bu5v to pson I get PFC boost to 400v. Both methods did this. The only time the standby led is flashing. Is with everything plugged in as normal. But is off when you press power.
...Leave a comment:
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Re: SHARP LC-70LE735X will not turn on
Oh I had a blonde moment and missed those. Here they are.
But looks like I forgot 22. Originally I missed 19 and 21
See below. Ill check again tomorrow. Sorry
[CODE]PIN LABEL VOLTAGE
1 PNL 12v +12v
2 PNL 12v +12v
3
4
5 UR 13.2v +13v
6 UR 13.2v +13v
7 UR 13.2v +13v
8
9
10
11
12
13 AC-DET +3.3v
14 PS ON +5v
15 BU 5v +5v
16 PNL-POW +5v
17
18
19 DIMMER +4.6v (edited)...Last edited by bl0wfish; 08-27-2021, 06:11 AM.Leave a comment:
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Re: SHARP LC-70LE735X will not turn on
Checked those with my tester. Came up good as far as I understand fets. I also lifted some traces and checked around the fets. Attached below is my findings. Everything seemed in spec...Leave a comment:
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Re: Samsung admits it uses a Tv Block App
i hear what your saying. but even if a tv or smart device was blocked incorrectly. they should be able to unblock it, as per news article. and honestly. not much is made to last anymore. if we made things that lasted forever like we used to. sales would plummet. try not to look at it too negatively.
that shit if true, bricking for no reason happened here in australia. it just wouldnt flyLeave a comment:
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Re: Samsung admits it uses a Tv Block App
ok mate, thats not really a bad thing. i mean apple, samsung and google can do the same with hardware. i can understand this is frustrating you. but they are getting bricked because of theft, just like phones. which why not? will make the tvs useless, only good for parts nowLeave a comment:
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Re: Samsung admits it uses a Tv Block App
more info. credible source? i dont think samsung would do well in a court battle if this was correct.Leave a comment:
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Re: SHARP LC-70LE735X will not turn on
Hey mate,
Yes and no.
i can only get the leds to flash if i force on the display with the mainboard disconnected.
otherwise tv hooked up as normal i only get 5v to PD Pin 15 BU5V
what you say makes sense. so i will check those fets. im real crap at checking with a multimeter, so ill use my tester haha.
i will have a coffee and check them and report back today. pain in arse. all locked in by heatsinks lol
thanks heaps
Ash...Leave a comment:
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SHARP LC-70LE735X will not turn on
Hey champions.
I picked up a 70" sharp lcd some time ago. Ive been trying to nut out why it won't turn on. I've gone through these forums countless times. And its doing my head in haha.
Psu is the delta DPS 222 BP
whoever had it before me has replaced the SB2100 diode on D7951 with a 1N5822 diode. Which i believe is for my 5v stand by.
I didn't like that and swapped it with a 1N5404, it felt a closer match to the SB2100 compared to the 1N5822, its the best i had in my spares bin. Let me know if that was a bad idea.
Anyway all I see with 240v... -
Re: Samsung PS51D550C1MXXY dead
did you get this fixed?...Leave a comment:
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