Sharp Aquos LC-40LE810E - 2 long, 1 short

[FlorianP]

Hello,

First of all I am not native English speaking, so sorry for potential mistakes or misunderstanding.

I have a basic multimeter and a soldering iron. No electronic pieces for replacement for the moment, but I can buy some.

I have a Sharp Aquos LC-40LE810E with issue.
When I turn on my TV with the remote control, I have 2 long flashing on the boomerang symbol, and no image/no sound.
I saw in the service manual that I need to click on « menu » button of the remote control to have more information.

--> Error core is : 2 long, 1 short flash on the boomerang symbol, that repeat over and over.
According to service manual of the TV, this error code is :
- « PS_ON AC_DET failure »
- « AC_DET (72pin : Abnormal (L) If error is detected during start-up or operation, the power is turned on again by interrupt handling (instantaneous blackout processing) »

Service manual is available here : https://www.manualslib.com/manual/87...page=55#manual

When I plug on the TV to electricity, I have a little noice around power card. This noice (frequency) changes a bit with boomerang symbol lightening. Probably normal behavior ?
I see no visible damage on the Power Card at the back of the TV. Main fuses seems OK.

I measured voltage on PD connector pins with power turned on, after boomerang signal is up and with all connectors plugged into the power card (I dit not remove something at this time).
PD-1 - UR13.2V (SIGNAL) : 0V
PD-2 - UR13.2V (SIGNAL) : 0V
PD-3 - S13.2V (AUDIO) : 0V
PD-4 - S13.2V (AUDIO) : 0V
PD-5 - SGND (AUDIO) : 0V
PD-6 - SGND (AUDIO) : 0V
PD-7 - SGND (SIGNAL) : 0V
PD-8 - SGND (SIGNAL) : 0V
PD-9 - AC-DET : 0V
PD-10 - PS-ON : 0V
PD-11 - BU5V : 4,99V
PD-12 - PNL-POW : 0,09V

Right after I just plug power cable to electricity, voltage at PB connector pins 1-2-3-4 came up for a few seconds to 13,04 V and pin 10 came up to 3,01V and then dropped to zero since boomerang symbol turn on.
For the moment, I made no change on the card, just measured some values with my multimeter

Please note that a read all the following (very interresting) thread https://www.badcaps.net/forum/showthread.php?t=49486 but I am not sure I am facing the same issue (they have a 2 long – 2 short error code, even if they are talking about AC_DET failure also)

I also read this tread https://www.badcaps.net/forum/showth...AC-DET&page=16 and note that post #303 solved the issue by soldering an additional resistor on top of R7019 but another threas say it coul be only a temporary solution.

Also other people (with same issue ? diffucult to understand as there are multiple discussions in the threads) changed the 4 opto Cosmo 1010-817.

In advance, many thanks for your help !

Florian

[budm]

Re: Sharp Aquos LC-40LE810E - 2 long, 1 short

"PD-9 - AC-DET : 0V"
Normal condition is around 3V.
So you can try to drive the LED of the AC-DET OPTO by changing the resistor or replace the OPTO for the AC-DET circuit.
The service manual does not provide any schematics.
Is your power supply board DPS-126 CP?
Show us the pictures of YOUR board.

[FlorianP]

Re: Sharp Aquos LC-40LE810E - 2 long, 1 short

Hello Budm,

First, thank you for your help.

My board is a "DPS-126CP-1 A"

I attach 5 pictures : Power card (face & back), focus on optos (face & back) and focus on PD connector if needed

The reference written on optos is : COSMO 1010 817 K20 H
On a famous chineese webstore, I see this reference : COSMO 1010 817C K10101C DIP4 COSMO1010-817 DIP-4
Is that the same component ?
Not easy to find on a european website, so I think I will wait for weeks before having them...

[budm]

Re: Sharp Aquos LC-40LE810E - 2 long, 1 short

Spec sheet:

[FlorianP]

Re: Sharp Aquos LC-40LE810E - 2 long, 1 short

Thank you Budm,

I am not sure of what I can purchase as a component.
The reference written on the 4 optos is : COSMO 1010 817 K20 H
As per the datasheet:
- COSMO 1010 817 is the main reference
- K20 is the year and month code (I think year and month of production)
- H is normally the CTR (Current Transfer Ratio)

BUT... H is not described in the datasheet (only A, B, C, D and E).
In different vendors, I have not seen any "H" value

Do you know if I can buy these components:
- https://fr.aliexpress.com/item/32829933915.html
- https://fr.aliexpress.com/item/32953604592.html

Thank you in advance for your advice

[FlorianP]

Re: Sharp Aquos LC-40LE810E - 2 long, 1 short

Hello,
Can you please help me to identify the appropriate reference ?
I do not want to solder a wrong component ...
Thank you

[FlorianP]

Re: Sharp Aquos LC-40LE810E - 2 long, 1 short

Hello,

I recieved new optos with reference cosmo 1010 817 I12 C.

As I didn’t know which opto had to be changed, I changed the 4 optos on the card.
Now my TV is working well !!

Many thanks to budm for your help.
I hope my experience can serve fo future people

[budm]

Re: Sharp Aquos LC-40LE810E - 2 long, 1 short

Thanks for the follow-up on the repair.
BTW, you should record the Voltage readings of the connectors for future reference so you know what they should be when the TV is working correctly.