Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

[johnboy183]

My latest acquisition is this LED Tv with the following symptom.
When switched on at mains the standby light comes on solid red . Pressing Power on or using RC fails to bring it out of standby. Switching on and off several times at the wall and then pressing the Power on button or remote sees the tv come fully to life ans stay that way with all functions working and a superb picture and sound.
When told these were the symptoms I was a bit cynical but sure enough nothing else seems to get the tv to work other than the above procedure.
As the set is powered by a "power brick" supplying 12v it was easy to substitute various other 12v power bricks but all work as above. Hence I cant see the PSU being at fault.
Have removed and checked every cap on the mainboard and all are fine. No dry joints or burnt components seen. LED inverter board seems fine.
When at standby the board shows 12v and 5v standby alt all the relevant test points and when the tv finally comes to life every marked voltage on each board point measures exactly what it should be.
Have also done a full system reset - which showed no improvement and now seem to be out of ideas.
I assume from the symptoms some faulty component is requiring the external voltage to be removed so the standby and red light dies before it will reset itself and then only after several attempts.
I would be extremely grateful if anyone has hit this problem before as i have never seen such especially with the power coming from an external psu or can point me in a new direction or highlight a component that can do this.
Many thanks.
John

[ReeceyBurger123]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

Probably failed firmware, can you get some pictures and models of the boards used ?

[johnboy183]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

Will post some photos of the board as soon as i can. I would have hoped the system reset might have put such gliches right but obviously not. Cant find a service manual or schematic so difficult to troubleshoot and no one seems to know of an Akura procedure to get into a service menu.

[vinceroger69]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

once you post a picture of the boards and part mumbers from them we maybe able to find a service code as these boards maybe used in other sets etc.

[comptek]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

more then likely a voltage regulator i have had that on a few bush and alba tv/dvd combis heat the regulator up with tip of soldering iron and it switches on waiting for pics

[johnboy183]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

taken some photos but struggling to upload them. Will keep on trying

[johnboy183]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

hopefully some photos now

[ReeceyBurger123]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

Ahh classic Cv junk ! I would probably say failed firmware on this one, but do you know how to check voltage regulators just to rule them out ?

[johnboy183]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

Is the firmware correctable or is it a new main board for the solution?
I am very much a hobbyist and not an electronics technician but have learned my way round a whole host of lcd monitors and tv's over the years. My way of checking voltage regulators has been to see what voltages they should have at each pin and then checking with my DVM to see if they are delivering that. Is there a better way especially in this circumstance as I was unaware voltage regulators could be "sticky" as I thought they either worked or failed?
Also is this board used in other sets as that widens my chance of success also?
Any guidance much appreciated as this tv is far too good to junk.
Cheers
John

[comptek]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

yes could be right there eeprom ! available from ohm supplies and others
voltage regluators may be marked e.g 1117 3.3 that means its a 3.3v reg
some have adst (i think) and it means volt adjustable which is controlled by resistors external to v'reg but the differance should be 1.5 of the voltage in or there abouts!

[johnboy183]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

so which is the eeprom chip on this board? Is it the Winbond 8 pin chip with two paint spots on it (U11)?
How difficult are they to programme as its not something I have tried as yet?
Cheers
John

[comptek]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

i beleive it is the one with paint on it
i have never programed one reecey maybe able to point you in the right direction

[johnboy183]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

Any additional views Reecy? - or any information on Eeprom replacement?
Cheers
John

[ReeceyBurger123]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

Yes U11 is the Spi flash Ic or as I called it an Epprom. Have you found the software ? One thing you can also try is spraying U11 with refrigerant I use a can of compressed air upside down. Cooling the Ic can sometimes make it work.

[vinceroger69]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

ive read but not sure how true is that you can sometimes freeze a flash chip read the data and rewrite it too a new chip. Ive got a cheap ebay programmer there a thread on this site about them.

[johnboy183]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

Have now tested the voltage regs and all test fine (once I can get the set to come out of standby that is!). Tried each of then with freeze spray while it was stuck in standby but nothing happened even though I kept trying the Power On button while doing so. When stuck in standby only one reg gets voltage anyway (U13 next to the Eeprom) and the large diode near it ( D3) shows no voltage. Once I can get the Power on to work all the regs go live and D3 shows 12 volts going through it.
I did try spraying U11 with freeze while pressing the Power on but nothing happened.
If it is the Eeprom ( and my knowledge of such is almost non existent) then I find it strange that I can get the set to switch on by removing 12 volt supply and then reconnecting it twice and tapping the Power on button 3 times and then holding it in and up she powers!! Unfortunately that is not a very practical way to turn your tv on and off!

[johnboy183]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

Have now tested the voltage regs and all test fine (once I can get the set to come out of standby that is!). Tried each of then with freeze spray while it was stuck in standby but nothing happened even though I kept trying the Power On button while doing so. When stuck in standby only one reg gets voltage anyway (U13 next to the Eeprom) and the large diode near it ( D3) shows no voltage. Once I can get the Power on to work all the regs go live and D3 shows 12 volts going through it.
I did try spraying U11 with freeze while pressing the Power on but nothing happened.
If it is the Eeprom ( and my knowledge of such is almost non existent) then I find it strange that I can get the set to switch on by removing 12 volt supply and then reconnecting it twice and tapping the Power on button 3 times and then holding it in and up she powers!! Unfortunately that is not a very practical way to turn your tv on and off!

[comptek]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

try heating v'reg with hair dryer so it gets hot then plug in tv and see if it turns on try and do them one by one like i said it does the trick on alba and bush worth a try

[johnboy183]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

Thanks Comptek (looks like your close to me - I live in So Shields!).
I think I have now shown the V regs not to be the problem as they all work fine once power actually reaches them down the circuit.
Still doing more measuring but not complete yet.
I find that when I have the set actually working and I press the Power button to put it into Standby the red light comes on but 12 volts remains across the board through D3 and supplying the v regs for some considerable time and then drops to 0v. If I then press the P on button or remote while these readings are either 12v or 0v the set wont come to life under any circumstances.
When i turn it off at the wall instead the voltage obviously plummets straight to 0v and if I switch it back on at the wall the voltage measured at D3 goes to 12v and stays there! - pressing the Power button when the reading is this 12v wont let the set fire up.
However on every third attempt of turning off then on at the wall the 12v displays then rapidly drops down to near 0v and if I press the Power on or remote at that point the set comes fully to life.
I think this must be a software problem with the Eeprom unless those better experienced and knowlegible than me can see this being caused by something I am not thinking of.

[ReeceyBurger123]

Re: Akura 22" LED TV AMELADVD2YR215FDVH Standby problem

Vr's can fail intermittently normally heating or cooling them can cause them to fail. Test them when the tv does not work and why you try to power it on.