Led Flashing Codes - Sharp 28JF-76E Service Manual

28JF-76E
This model is not provided with stereo led, so to let "flashing codes" for IC failures detection when the TV set does not
work, we offer the next solution:
• The detection of failure will be made with an external LED.
• The output of the flashing code will be via AV1 (pin 10).
• Insert a generic led diode between pin 10 and ground (i.e. pin 5) as shows the below picture.
Follow the sequence according to the below information, as a guide to fault finding.
1. Unable to read or write into NVM: 66% ON, 33% OFF twice and OFF for a second.
On Off
2. MSP failure: 66% ON, 33% OFF for three times and OFF for a second.
On Off
3. SDA 9380 failure: 66% ON, 33% OFF for four times and OFF for a second.
On Off
4. VSP 9407 failure: 66% ON, 33% OFF for five times and OFF for a second.
On Off
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LED FLASHING CODES

20 18 16 14 12 10 8 6 4 2
21 19 17 15 13 11 9 7 5 3 1
21
14