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

Noted this MB is not the exact same model as mine, and didn't notice the one big IC missing.. It's was S$20+ vs the exact model that cost S$200+, so ya, no luck..
The resale prices of this T is S$200-$500, so not planning to invest S$200+ for a MB..

So, unless or until an exactly model MB comes along, this will be the end of road for this expedition.

Thank you, Diah, Nomoresonys, and everyone for your coaching all the way.
Have a pleasant time here in the forum.

[Diah]

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

start with compare the wiring chart of the replament MB and original at the socket which connect to PCB from down side. to be sure PS_ON line and other are the same. also you have one socket more on the replacment & - one IC..
at the end it sound the replament not related to yours Model.

[beetle1303]

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

Hello again! Sourced a closest MB I can find without costing an arm..

Plugged and powered up - red led flashing 1x, slowly.
Tried all the forced restart procedures:
1) CHN- n VOL- : no effect
2) CHN+ n VOL- : no effect
3) CHN- n VOL+ : no effect
4) CHN+ n VOL+ : no effect
5) INPUT n VOL- : no effect
6) INPUT n VOL+ : no effect

Red led remains slow flashing 1x.

PD15 (BU+5) : 4.95V
The rests (odd number pins) all 0V.

Not sure if the new old MB faulty or not compatible, or is there other procedure after replacing the MB?

[nomoresonys]

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

ok, i get it now, lol, I like to verify powerboard and backlights first.

[beetle1303]

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

well it was working, then you messed with the mainboard connector, I think you tried to over-fix it, not good, maybe same as before re-check your work.

According to @Tiah the MB never worked, and we try reviving it by backing in oven, and then with a butane torch since I don't have a heat gun... This might have killed it more than curing it.

So re-soldering the PD connector on MB is just trying luck, and, no luck obvoiusly..

[nomoresonys]

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

ok, I thought he meant there was something messed up after mainboard connector reflow.

[Diah]

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

well it was working, then you messed with the mainboard connector, I think you tried to over-fix it, not good, maybe same as before re-check your work.

No, he did BGA work of the MB main CPU using GAS Flame .. thought the BBQ smell reached me from Singapore..

[nomoresonys]

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

well it was working, then you messed with the mainboard connector, I think you tried to over-fix it, not good, maybe same as before re-check your work.

[beetle1303]

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

poists 2, not exactly, becuase the LED indicator connected to MB not PCB, and the first points when PCB send BU5V this will be used to LED indicatore and to start the SPI Flash.

i thinl STB they mean start BL circuit. because other to tuen on 13 and panel 12 are clear.

any way. its good if you rework the socket on MB take it out clean the solder and resolder it again correct... who knows could we have different sign. since LED BL worked after rework soldering then do it on the MB socket too.

So not surprisingly, after re-soldering the PB connector on the MB side - no indicator lights, power backlights, nothing..

Anyone has any document or reference to Sharp booting sequence/hand-shaking protocols? I personal feel this would be a very help guide on focusing problem solving on Power Board first or Mainboard first.

[Diah]

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

poists 2, not exactly, becuase the LED indicator connected to MB not PCB, and the first points when PCB send BU5V this will be used to LED indicatore and to start the SPI Flash.

i thinl STB they mean start BL circuit. because other to tuen on 13 and panel 12 are clear.

any way. its good if you rework the socket on MB take it out clean the solder and resolder it again correct... who knows could we have different sign. since LED BL worked after rework soldering then do it on the MB socket too.

[beetle1303]

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

While waiting for MB, I was googling for a Sharp TV boot sequence/hand-shaking, but did not find a complete documentation.
This is what I guessed based on the conversions:
1) Powered up - PD15 BU5V gets 4.96V to MB
2) MB send PD24 STB 4.7V, turns on red standby indicator light
3) Pressed power button, MB sends PD14 PS_ON 4.95V to PSU
4) PSU turns on PD5-8 UR13. 2V 13.05V, and sends PD13 AC_DET 3. 27V to MB
5) MB sends PD16 PNL_POW 4.58V to PSU
6) PSU turns on PD1-2 PNL12V 11. 92V
7) MB sends PD19 Dimmer 0.14V and PD21 OFL 4.16V
8) PSU turns on BL!

Besides obviously more and various checks and sensing for and between each step, is this close enough, or far from being correct?

[nomoresonys]

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

ok, interesting, was wondering what combo was needed.

[beetle1303]

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

After a good night sleep rejoicing the romantic backlight, we thought of summarizing which PD pins must be jumped in turn on the BL. So a created a matrix, and start testing each combination.
To my horror - none of the combinations work and no more BL!!!

After several trial and errors - all jump wires are with 850ohm resistor, and only one with 983ohm, and it turns out, PD-21 OFL on only work with this 983ohm resistor, not the 850ohm ones!

Also, PD-19 Dimmer is not necessary for this work on also.

[nomoresonys]

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

Knew there was something wrong on powerboard side, NEVER saw on you couldn't turn on.

[nomoresonys]

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

at this moment i wouldn't care of this since PD-22 (ERROR) =0 V mean no error.
MB signal are not only V. its pules freq. we can see there are several pins need signal..

i never read some one successfully to run the BL on at this PCB all are one click.. one things more this BL had nothings to do with main fault.. because MB just one signal send PS_ON no other signal as the cpu communication failed.

This was a very good clue too, the first part that is. lol.

[nomoresonys]

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

well I should have mentioned checking the solder joints, I guess I preach it so much I just assumed I already did, I must be slipping.

[nomoresonys]

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

I was pretty sure I saw this model with forced on backilghts on some forum somewhere.

[nomoresonys]

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

VERY nice, mystery solved.

[Diah]

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

Cleaned up my shoddy act on L1 & L2, and Tada - BL ON!! Such a beautiful sights!!!

Thank you every one - your guys are magicians to me

And yes sir - waiting for my MB.

so you can sleep today on the screen light LOL

[beetle1303]

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

check again yours soldering work that no short between pins...
remove the dimmer jumper they will flash again
wait for yours MB.

Cleaned up my shoddy act on L1 & L2, and Tada - BL ON!! Such a beautiful sights!!!

Thank you every one - your guys are magicians to me

And yes sir - waiting for my MB.