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No Display In TV Due To EEprom IC Fault
This Haier TV came in with the complaint of no sound but have OSD menu. When the TV antenna was connected the picture appeared for a while then went off (black screen) and could only see the volume once the volume control was pressed.
The below picture was just before it went off after the antenna was connected. Observe that the picture was also not full screen.
It was just half screen and did not fill up the whole screen.
Next, the TV cover was removed and it was full of dirt and dust and I had to clean it with a brush and a vacuum cleaner.
From my many years of repairing CRT TV, the chances was high either the microprocessor or the TV EEprom data could have been corrupted.
Since getting a new EEPROM IC was easy thus I replaced the EEprom first and see how it goes.
The new EEPROM IC part number was 24C08 and it was a blank IC.
Once the EEprom IC was replaced with a new one, I powered up the TV and saw that the picture appeared half horizontally and need to change the language setting. I was on the right track because if after changing the EEprom IC with the same exact symptom as the original one then possible I have to replace the microprocessor.
Now, in order to enter into the TV service mode I had to press Volume button and OSD Menu button in the remote control at the same time for about 15 seconds. After that the TV switched to factory service mode where I can change the RGB setting and the height adjustment of the TV-See the photo below:
Once the adjustment was done, the setting was save in the EEPROM IC and the picture was back to normal again-see the photo below:
Conclusion- Many times the TV problems was not related to hardware failure. In fact it was due to the corrupted of the programs or data of the EEPROM IC. If you read my previous articles on “No sound symptom in TV” you would surely know the impact of a corrupted EEPROM IC. If you wish to learn about CRT TV repair , you can check out Humphrey’s ebook on CRT TV repair HERE
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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