Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

[beetle1303]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

I found this page from one of the link provided interesting and will be very useful if the replacement MB doesn't fire-up the backlight.

[beetle1303]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

I went ahead to order a closest model MB for replacement, arriving in 10-20 days. Hopefully it will turn on the PD pins for backlight, and fire-up all the led strips.
Figure crossed!

[nomoresonys]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

ok, yeah I thought there should be some sort of flash but wasn't sure.

[Diah]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

so according to that, it's looking like maybe one bad led per string then?

i don't think so, because he had MB issue, and this sharp when you force it on as he did.. will clear error at LED if exist and light them up even for short time or long time with just few strips.

[nomoresonys]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

from the PCB design of LED section. it sound LED are 5-6V. so 30x6 180V. beside the ampere, tester show you 174V. and i do know of sure its very limited with currents.

so according to that, it's looking like maybe one bad led per string then?

[nomoresonys]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

worth a try, from what I gather the lc and le just might be interchangeable, if it don't work you could resell it I guess.

[Diah]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

But I am tester each of the 14 strips individually - should be able to lit up the 30 leds in it as I have tested it on older 30-led strip.
I will retry in total darkness and see if what happen.

*the link to MB you provide is quite expensive... I am searching of cheaper ones from China but they seems to be of different models.

from the PCB design of LED section. it sound LED are 5-6V. so 30x6 180V. beside the ampere, tester show you 174V. and i do know of sure its very limited with currents.

[beetle1303]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

yes, that must be it, if you can match those f733wek6 or f733k6, you should have a match, as far as other boards working, I don't know.

https://www.bukalapak.com/p/elektron...35x-lc70le735x

This part link provided by Diah looks like identical to my original MB, but it's 10x more expensive the the close-look from China.
I think I will try my luck with this cheap one.

[beetle1303]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

i see now each socket 14 wires.. this is monster.. yours LED tester cant turn on them as i think its limitet with currents few ma.
at time yours LED BL are 420 LED

in Australia there are used one MB and in Philippine too

But I am tester each of the 14 strips individually - should be able to lit up the 30 leds in it as I have tested it on older 30-led strip.
I will retry in total darkness and see if what happen.

*the link to MB you provide is quite expensive... I am searching of cheaper ones from China but they seems to be of different models.

[nomoresonys]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

yes, that must be it, if you can match those f733wek6 or f733k6, you should have a match, as far as other boards working, I don't know.

[Diah]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

See attached pic - there are 14 LED+ and LED-
With LED tester red probe on LED+ and black probe on LED-, it reads 173-175V range, mostly 175V. *Cannot* see any light from the back of chassis holes, nor from the front screen.
*LED tester working when tested with spare led strip.

i see now each socket 14 wires.. this is monster.. yours LED tester cant turn on them as i think its limitet with currents few ma.
at time yours LED BL are 420 LED

in Australia there are used one MB and in Philippine too

[beetle1303]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

what are the 5 letter numbers on the white sticker on the original mainboard?

This white sticker?

[nomoresonys]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

what are the 5 letter numbers on the white sticker on the original mainboard?

[beetle1303]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

Nope... torch with lowest frame for 1 minute or so, and stopped immediately at the sight of light smoke! No, it did not trigger fire alarm, but retested and ya, completely BBQed

Shopping for a replacement MB:
This one from TaoBao is the closes I can find:
Model: LCD-70LX732A MB: QPWBXF733WJN2 Panel: LK695D3GW30C

Original:
LC-70LE735X MB: QPWBXF733WJN2 Panel: LK695D3GW3AD

You think this will work?

[beetle1303]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

i just reading back yours POST #13 you wrote that you cant see any light of LED with tester however the tester show 173V !!
you dont have 14 strips from the photo i can see only 7 wires on eack socket the LED - socket L2 and LED+ socket L1
so forexample testing LED-2 with LED+2 LED-11 with LED+11 and so on.. you can see from amy whole at the chassus if there are light or not.

See attached pic - there are 14 LED+ and LED-
With LED tester red probe on LED+ and black probe on LED-, it reads 173-175V range, mostly 175V. *Cannot* see any light from the back of chassis holes, nor from the front screen.
*LED tester working when tested with spare led strip.

[Diah]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

A quick checked - the big cap shows 403Vdv but all the transformers above it shows no voltages in all the output pins... With a LED tester - all the 14 led strips are mostly 175V, with 2-3 showing 173-174V.

i just reading back yours POST #13 you wrote that you cant see any light of LED with tester however the tester show 173V !!
you dont have 14 strips from the photo i can see only 7 wires on eack socket the LED - socket L2 and LED+ socket L1
so forexample testing LED-2 with LED+2 LED-11 with LED+11 and so on.. you can see from amy whole at the chassus if there are light or not.

[beetle1303]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

wow... try but could be good if you put weight on the IC and from downside start heating or from the top ab to you just to avoid the chips move from it place... be sure you know the emergency fire police Tel No,

Nope... torch with lowest frame for 1 minute or so, and stopped immediately at the sight of light smoke! No, it did not trigger fire alarm, but retested and ya, completely BBQed

[Diah]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

I have a butane torch for brazing that can heat to 700°C - can use this at low frame for 1-2 minutes?

wow... try but could be good if you put weight on the IC and from downside start heating or from the top ab to you just to avoid the chips move from it place... be sure you know the emergency fire police Tel No,

[beetle1303]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

you need at least 250° only hot air gun can do,, or infrared Korean BBQ

I have a butane torch for brazing that can heat to 700°C - can use this at low frame for 1-2 minutes?

[Diah]

Re: Sharp LED TV flashing green 2x per second - LC-70LE735X, DPS-222BP, RUNTKA857WJQZ

Nope.. with the big 2200w hairdryer at max heat min for 6-8min, nothing happens..

you need at least 250° only hot air gun can do,, or infrared Korean BBQ