Re: Sharp LC-52E77UN TCON activation WITHOUT motherboard. I2C reverse engineering hel

Update: I scanned i2c addresses on the TCON board, running standalone, using the Arduino Uno and the example i2cscanner sketch. This is good news since it means it is possible to use 100kHz i2c communications. Note that the [B]TCON board uses 3.3V logic[/B], whereas the [B]Arduino uses 5V logic[/B], so a [U]logic level shifter was used[/U] in order not to damage any ICs that are not rated for 5V (many i2c EEPROMs, for example).

The following [U]two addresses[/U] were found: 0x4F...

Hi everyone. [Sorry for the long, detailed post in advance].

I have a Sharp LC-52E77UN which randomly shuts down--could be within 15 minutes, could be 40 minutes, over 1 hour, it's unpredictable. From reading the service manual, I was able to get into service mode (where the K is displayed), and found the following error flag toggled: "04 Initial Communication Error 4 -- Error reason: To the communication setting reception," which, from contacting an eBay TV repair store, I was told is caused NOT by a bad TCON (which was my first guess), but rather the motherboard....

Re: Driving a Sharp TCON/panel with a universal main board

I ordered the v29 board, which I expect should arrive in a month from China. And I also ordered a 24MHz USB logic analyzer from Amazon, which should arrive in a week--I will use this to decipher the i2c signals that must be present to activate the TCON board. I will be using Sigrok Pulseview.

My hope is that I can use an Arduino (Attiny85) to play back the same waveform to activate the board. I'll keep this thread updated if I succeed in deciphering the i2c commands.

Re: Driving a Sharp TCON/panel with a universal main board

Hi. This might be late, and you probably have a new TV by now, but my Sharp LC-52E77UN is on its last legs, motherboard wise--it gets a communication error randomly and shuts off and the OPC and power LEDs start blinking.

I am also planning on getting a V29 universal LCD board wired to the LCD, because I am for sure not paying $200+ for a replacement motherboard when you can get a new 50" LCD TV for $250 these days...

I probed the the LP connector with continuity mode, and found that TEST_MODE...