No Sound In TV Caused By A Corrupted EEProm IC
This Philips CRT TV with the model of 21PT2152/69R was brought to me for repair by a friend of mine. The complaint by him was no sound but when run on AV mode (sound) it was good.
I tested it and true enough even the volume already set to 72 (see photo below) the sound still can’t be heard.
Next I entered into the service mode by using few combination keys by following the steps below:
Bad news, even after change the setting in the service mode, the sound still would not come. I left only one choice which is to reprogram the EEprom IC. I kept lots of EEprom IC original programs for many different brands and I have this Philips Model -See the photo below:
I soldered the bad IC out from the circuit board and placed it onto the IC socket in the EEprom programmer. Once turned On, this programmer will overwrite the bad EEPROM data with the good data and the LED 3 will blink. If the blinking has stopped, the LED 3 will remain lit.
I took the IC out and soldered it back to the TV board and turned On. Voila! the sound came back. Even before it hit 50 in the sound control I could already heard the sound.
If in case still no sound then you may have to follow the procedure below to use the Compair software.
I would not cover this procedure since the TV now already working. If you want to be good in CRT TV repair you can get humphrey’s ebook HERE.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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October 12, 2016 at 5:02 pm
Good repair Suranga. Well done !
Albert van Bemmelen
October 12, 2016 at 6:22 pm
Very professional as always and quite a stock of Eeproms you keep Mr.Suranga! I don't want to be picky but I wonder though if it would not be much cheaper and a lot easier to use a universal Programmer like the TL886A and store all the Eeprom files on Disc or HDD? It also would save time and space I guess? And in the repair business time is good money. Thanks for the article.
October 13, 2016 at 12:11 pm
Hi.. Mr Albert van Bemmelen,
Yes TL886A is Very good solution.
Ok Mr,Thanks !
October 15, 2016 at 10:12 am
Be sure and get the TL886A, not the TL886CS.
Albert van Bemmelen
October 16, 2016 at 12:04 am
Indeed you are right Robert. Although there are people who buy the cheaper TL886CS and rebuilt it to the ICSP enhanced TL886A unit, so it can program and read IC's larger than the standard 40 Pins IC's by programming them Serial-In- Circuit. But than you don't have any warranty on the modified unit. And buying the better A version with the ICS Programming cable expension also prevents the user from not working IC or Firmware updates in future releases.
October 17, 2016 at 12:36 am
Yep, Plus If you upgrade the CS, you will have to find the connectors and components that come with the A to be able to take advantage of the ICSP.
September 8, 2018 at 5:54 pm
I have in my possession TL866CS, is TL886 different from TL866?
How is A superior to CS?
October 12, 2016 at 9:30 pm
very nice & interesting solution thanks.
October 12, 2016 at 9:49 pm
Good information.. can u tell me how the program is getting corrupted?
October 13, 2016 at 3:42 am
The program could be corrupted by many reasons.
The most of the reasons can be some power failure until the
device is communicating with the eeprom, maybe the most time
until there is a writing condition to the eeprom.
Other thinks can also corrupt the data like a bad eeprom ic
or a bad cpu or a worse firmware in the cpu but other kind of
possibilities are too in counting...
My best regards.
October 13, 2016 at 12:04 am
Very important info, thanks Sir.
October 13, 2016 at 12:34 am
Nice Job there. I have to get an EEprom programmer myself and learn to do these type of jobs. Good article and thanks for sharing.
October 13, 2016 at 12:24 pm
Ok Mr. Andre.
Thanks You !
October 13, 2016 at 1:05 am
Good job, Suranga. Albert has a good point, but it couldn't hurt to do both.
October 13, 2016 at 12:23 pm
Hello Mr. Robert,
Yes Mr. Thanks you !
October 13, 2016 at 1:10 am
Good job Mr. Suranga !
October 13, 2016 at 3:45 am
Very nice writing and handy info for technicians who repair TV.
You always do a nice job quick and finish.
I like you articles.
My best regards.
October 13, 2016 at 12:19 pm
Hi. Mr. Chris,
Thanks You Very Much !
October 13, 2016 at 5:44 am
VOW! That is something which I have never done! Great info and great work!
October 13, 2016 at 12:28 pm
Thanks you !
October 13, 2016 at 7:39 am
Another impressive repair Suranga. Thanks for sharing
October 13, 2016 at 10:32 am
A good repair. Your eeprom stock is impressive. Would it be a better repair to use a new eeprom on the possibility that the old one has some other kind of fault? You could solder in an 8 pin socket and eliminate the possibility of heat damage to the new eeprom.
October 13, 2016 at 3:02 pm
Great article as usual. Thanks for the explanation and diagnosis. After a previous article on this site, I bought a TL886A to try and reprogram some IC chips. But wouldn't you believe it - I haven't had an IC repair to do since! But I am looking forward to giving it a try when I get the chance.
Keep up with the good work!
October 20, 2016 at 12:18 pm
Hi Mark. You know the old saying, It's better to have it and not need it, than to need it and not have it. Plus, until you need it, you can still play with it.
October 13, 2016 at 8:43 pm
thanks for informative article.
October 14, 2016 at 12:31 am
Nice repair, and good explanations Suranga.
October 14, 2016 at 9:00 pm
keep it up i like it
October 14, 2016 at 10:21 pm
Sir, thank for the article.
Sir I have a Samsung TV( bio),the problem is the TV frequently on and off automatic ally I have change all capacitor in high voltage area but still I have the problem .sir in opinion the problem is in the hot Area because when it become off the g2 become high because the screen become green with white lines and I feeled that the main ic got the supply I mean the 5 and 3.3 volt supply. Plz help
October 15, 2016 at 3:39 pm
I think this Tv fault may be caused by bad
ABL Line or R.G.B circuit. Check first all resistors and diodes in ABL Line.
Henrique Jorge Guimarães Ulbrich
October 15, 2016 at 7:34 am
That's great, Suranga
October 15, 2016 at 12:31 pm
I like this article. Plz tell me which programmer is useful, is it universal programmer or something else ?
October 19, 2016 at 4:52 pm
Thanks u very much for your very informative article. I have a 21 inch sansui crt tv with the picture pulling problem, I have checked the supply to the vertical, horizontal, all are present as it was specified, all the capacitors in both the horizontal and vertical section seems ok but the problem still exists.So i would like to ask u what would be the problem. Thanks in advance
October 20, 2016 at 1:00 am
Good work Suranga
December 25, 2016 at 8:44 pm
yes, job well done, we should still learn more, and diagnose well.
February 8, 2020 at 7:43 pm
hi!!! i have the same problem.. the philips crt tv i troubleshoot has no sound in tv but good sound in AV1.. i noticed that everytime i reprogram memory eeprom ic and return back to the board it automatically restore the data back to its usual data. can you please help me...