my SHARP LC-40LE810UN has issue help needed to find and fix.

[nilesh]

Hi everyone,
My sharp - LC-40LE810UN works excellent till last year , than problem starts
it still works excellent till it decide to drive me crazy. middle of normal viewing
it suddenly shut off and , power light blinks - 1 long (slow) + 3 short(FAST)
it start to happend from last year ,
i power restart tv with service screen - K - i found lamp error 5 , i reset , i also did factory init , and few other param to reset , all goes well and work till last week, the same problem jump back , i can reset again same way
but i am looking to find solution if there is any physical damage , like LED / bad CAP / its power board ?
when issue happend first time year ago , i open back panel , expect to see some swellon / busted cap etc but didn't saw anything , just vaccume lint and close.

- 1 long + 3 short blinking code makes some confusion , some place it says few LED , or power board , also 3.3v logic board issue too...
- also i notice the front power LED is glow quite weak , not bright enough while normal operation.

can any expert help and share on this issue . help appriciated , thanks in advance.

thanks

[CapLeaker]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

turn the backlights down some and see if it gets any better

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

Thanks for reply ,
yes , i repeat all error to reset and fact. init .
after i down backlight to 50% , seems know by this weekend when TV works for long hours . Thank you !!

- everytime when issue happens , i found parameter - LAMP Error - 5
- seems like LED strip or one of LED on strip may have issue, my son told me sometimes normal working , he show some backlight flash adding , means some LED struggling to keep stay on strip , but i am not expert so discribing syptoms . update apricated !! thanks

[budm]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

Your LEDs are going out, keep the backlights as low as possible and keep using it until it dies then take the panel apart to get to the LED assemblies, it is not simple job.

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

Thanks for reply,
seems issue not fixed , now while normal working screen suddenly goes off,
(one short + 1 long) blink starts before it was mostly (1 long +3 short )
, as i go in K mode to reset lamp error 4-5 ,

this one short +1 long blink create confusion,

issue is main power supply board or LED strip ??

thanks in advance

[budm]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

I do not see 1 long 3 short error code in the service manual. Are you sure what you are seeing?

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

Thanks ,
now its more often error blink (1-1 short / long)
also i notice backlight addon zapping while normal operation and working
and reach point when error reach to 5 or more and tv stop
seems i have to dismentle panel to check LED inspection.
pic will be post for review other members ....

thanks all of you !! appriciated !!

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

hello experts,
seems this tv is bit crazy , based on blink code its shows it has one of LED stripe of few LED on stripe are bad , but latly tv doesn't do this(1-short 1-long ) blink so not sure its LED issue weather syptoms are LED issue

- now it does often random power restart(REbooting) in middle of watching
no anykind of LED blink code

- other thing is when i use remore control to switch off TV , picture on LCD screen goes off, the front power LED become dull and stay like that for hours , LCD screen stays energized (with dim purple blue shades- not completely black like switch off) remote control doesn't responsce , than i have to remove power plug for 10 second and tv works normally with Random power rebooting issue

can any experts give an idea whats could be issue, because of this new syptoms i didn't open panel for check LED

help apriciated ,thanks in advance.

[Davi.p]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

Sure i'm not good in english but reading you is also a pain..
I don't think LEDs are involved, when them fails them can't resurrect with a simple error flag remove!
This model has 2 common issues, the one the faulty AC-det signal from psu to mainb. that the guilt is optocoupler PC7730, the other is the faulty KIAxxxx (don't remember the name) on PSU, 12v regulator. Get the psu schematic by searching it's model, i think Delta DPS-126CP, then locate the component and test its voltage. Bye

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

Thanks sir , Appriciated !! let me find scamatic first !! thanks again
btw my tv has power supply RUNTKA693WJQZ,
DPS-152CP-A

[Davi.p]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

?? Photo of the p.supply?

[budm]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

You need to report the Voltage readings of the connectors PD, PL, and LB.
You MUST report the reading in this format:
Connector: ??
Pin Name: XXX, Voltage reading: ??? V
Pin Name: YYY, Voltage reading: ??? V
Pin Name: ZZZ, Voltage reading: ??? V
Pictures provided by shopjimmy: Sharp RUNTKA693WJQZ (DPS-152CP-A) Power Supply Unit

[Davi.p]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

Hi, I'm wondering why the tv model is the same as mine but the psu is different and also 90 degrees rotated! Anyway it seems the components are the same and also almost the same markings, sorry the optocoupler is PC7703 not 7730 and the KIA chip is the one in TO220 with 4 legs Q7909 at bottom right..

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

thanks both of you experts !! much much apriciated !!
tomorrow i am planning to open my tv and things update here soon.
also someone locally willing to sell me original(same number) brand new power board
for i offer him $40, by tomorrow i ve answer too... !! again thanks

[Davi.p]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

I don't trust is brand new, always better to fix the old board, more longevity.

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

yes Davi,
i agree with you and thought same , thats why i offer him $40 and he is ok with 7 days return warranty too. but definately tomorrow i will try to fault find my original board. the main issue for me is TV is not completely down it does rebooting randomly sometime 6-7 time in 1 hour sometimes it reboot only one time in 2-3 hours so when i will measure componant it may looks all fine because tv is fully operational. thats why i will gamble to replace both parts you mentioned !! thanks again and apriciated

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

Hi Davi ,
here i have attached pic. with red squre marked on both compotant
to confirm this two right ??
thanks again

[Davi.p]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

the main issue for me is TV is not completely down it does rebooting randomly...

Sorry, forgot this, so maybe it's better , you can only have the optocoupler bad.
Yes the parts marked are right.

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

Thank you sir, i will start to replacing with optocoupler first , and test for few hours what it does, thanks

[nilesh]

Re: my SHARP LC-40LE810UN has issue help needed to find and fix.

unfortunately i can't open TV today , its completely off from my mind , that we have labourday Holiday today , so everthing is closed i can't get parts means tomorrow i will get this optocoupler PC123 (made by sharp) by wed or thrusday i will make some progress.
thank you for help