Flash Rom IC Caused Standby Problem in LED TV
A customer brought in his LG 32″ LED TV with the complaint of standby problem. The color of the power LED is red color. The TV can’t even be turned on with the help of remote control and front panel power button.
As usual, the first thing to do is to remove the cover and once the cover was removed I could see three circuit board; Power supply board, main board and the T-con board.
The below photo is the mainboard and this is where all the important memory ICs located. I have checked that all the ICs have good dc supply voltage in which I guessed the problem would be on the corrupted data in one of the memory ICs.
The memory IC that I suspected to have problem was the flash rom IC but because I do not have the similar IC with the programs in it, I can’t do anything about it. Fortunately I have a good friend working in LG service center and he had the original IC.
I soldered the new Flash Rom IC to the mainboard and powered on, the display immediately appeared and this confirmed the flash rom IC was the cause of the standby problem.
Assuming if after the replacement and the problem is still the same then I may have to get my repair friend to pass me the microcontroller IC.
Conclusion- Standby problems can be caused by corrupted data in memory ICs, improper dc voltage, shorted components and the main power supply itself. If you wish to learn the tips and know how about LCD/LED/OLED Repair you can go to Kent’s and Damon’s websites. Invest in the ebooks to gain experiences. Buying things such as shoes, shirts and etc are not experience. I hope you got my point.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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Note: You may check out his previous post in the below link:
https://jestineyong.com/standby-problem-in-haier-lcd-tv-repaired/
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Mark
August 18, 2017 at 4:03 pm
Hey Suranga,
I have the same issue with a TV that is now shoved under my lab table, awaiting repair. After testing I came to the same conclusion as you have - corrupted data on the ROM chip. I purchased some replacement chips and they have been sitting in their packet for some time, staring at me, just waiting for me to find some time to fit them.........on the 'to-do' pile!
Thanks for your article.
Suranga Electronics
August 19, 2017 at 10:26 am
Aha MrM ark..yes this is common fault for some Tv Brand.
Thanks.
Calum
September 2, 2017 at 11:17 pm
why dont you buy a programmer.you can re-flash ROM easily.
Justice
August 18, 2017 at 8:49 pm
Good job Suranga, thanks for your excellent technical expertise, yes I should invest on ebooks.
Suranga Electronics
August 19, 2017 at 10:28 am
Ok. Thanks Mr.
Amir Mukhtar Ashrafi
August 23, 2017 at 3:44 pm
Good Job
Thanks you
RONALD FROM USA
August 18, 2017 at 9:21 pm
PLEASE GIVE MODEL NUMBER OF TV YOU ARE REPAIRING IN YOUR POST. WHAT IS MODEL OF LG TV?
Parasuraman S
August 19, 2017 at 12:01 am
Well, that is a good intellectual quickness!
ajay
August 19, 2017 at 1:10 am
well good job.
but can you please explain how you came to the conclusion of the rom being corrupted.
troy
August 19, 2017 at 4:18 am
Good job sir.I have an lg tv model number 32cs410-MB where the standby light is on always.trying to put tv on does nothing.power supp,tcon and inverter are all good through self tests so concluded main board is problem. I searched for mainboard but cannot find original but finds one for model 32cs410-tb one mark LP240/c EAX64671103(1.0).can any one tell if the boards are interchangeable. The number followimg eax is the only thing diffrent .please help team.thanks if anyone knows where I can find main board for the model 32cs410-mb thanks
Tito
August 19, 2017 at 4:50 am
Good work Suranga. Can't the ROM chip be programmed like how we do with other tv memory?
graeme
August 19, 2017 at 6:38 am
"The memory IC that I suspected to have problem was the flash rom IC"
I am curious to understand the reasoning behind this conclusion?
Albert
August 19, 2017 at 3:56 pm
Thanks for the good article Suranga. I have a similar kind of problem with my Sunray4 Sim2 Dreambox 800HD se satellite reciever with Wifi module that after a year now has a memory problem in the SIM flash or Nand memory chip(s). Yassinov's optiflasher and Sunray Flashup report errors in memory sector 3. So it is now bricked and without any matching replacement parts or the right flash info can't be fixed sadly. (111 euro gone now! Reciever was bought in China almost 12 months ago, and the Seller gave no warranty whatsoever after my message!).
isaac
August 20, 2017 at 11:53 pm
well done this is a good work
Calum
September 2, 2017 at 11:17 pm
good job
Chris
September 24, 2017 at 3:49 am
Hi!
Well, hmmm, I'm a bit confused with this article and repair.
I have several questions:
- Is it a Flash memory or a ROM memory?
- what is the type of that whatever ic?
- how you find out the exactly one memory ic which is bad?
- what is the power voltage for that ic?
- what cos the data corruption?
- how do you recognized does the data is corrupt in the ic?
- could it be does the unit is still under error and the data
corruption will come back again soon?
- why you not asked the friend to send the dump of the ic by mail and not
programmed it with a programmer? it's easy and simple to reprogram this ic.
- if this is a common problem on this type of TV with this type of board,
I assume you made a copy of the data from the new ic from your friend,
for future repairing of this kind of problem...
So, I assume from my experience from the field of eeproms, flash memories, cpu
etc. does this ic is a 64M-bit serial flash memory. The vendor is Winbond and the type of this small device is W25Q64FVSIQ.
This device can be programmed by the nice and cheap TL886 programmer.
The power supply voltage for this tiny ic is from 2.7V to 3.6V.
I assume the customer or the service guy tried to make a firmware update on this tv unit and uploaded a wrong version of firmware. In that tiny flash memory is the firmware of the tv. If a wrong firmware is uploaded the tv is actually bad.
Ok, I appreciate your article and thank you for sharing that kind of info, but I don't recognized your thinking logic and the path how you made that repair.
Otherwise ok, a good article but with many secrets.
My best regards.
ombra32
October 5, 2017 at 7:26 pm
I agree with Chris completely...
I've a Samsung S22A450MW lcd monitor with very similar ploblem, I think, but unfortunately I can't find the correct firmware, so the device is still unrepaired..
Ranjan Kandpal
April 12, 2019 at 8:32 pm
I replaced the IC ROM with same kind of configuration but its still on the stand by mode.