Got this 37" 1080p Sanyo in... won it on eBay for £37.00 dead... it's just a 37" Vestel but aside from the crummy caps on PSU it isn't too bad. It has an LG Philips panel using EEFL tubes (similar to CCFL, but external electrode - more reliable, more efficient.)
When plugged in, the backlights light up, video appears (perfect picture) but it goes black after 2 seconds. Backlight goes out. ON/OFF & 24V on inverter are both good.
I noticed that one edge of the panel is slightly darker than the other - the left edge. And the inverter has two transformers on it, one for each side of the panel. So, I decided to swap the two transformers... and the problem moved to the other side. I suspect the left transformer to be bad. Unfortunately, the transformer is essentially unobtainium... I have to replace the entire inverter, which is available from China for £24.88. Not too bad, but would have preferred to swap the transformer directly.
This is the first Vestel I've seen that uses an FPGA on a sub-board... it seems to use it to translate the LVDS for the LG Philips panel... very strange indeed! It confuses me that they would cut so many corners on the caps inside the unit and then stick a somewhat expensive Xilinx Spartan FPGA inside it!
Will update with video on repair soon.
When plugged in, the backlights light up, video appears (perfect picture) but it goes black after 2 seconds. Backlight goes out. ON/OFF & 24V on inverter are both good.
I noticed that one edge of the panel is slightly darker than the other - the left edge. And the inverter has two transformers on it, one for each side of the panel. So, I decided to swap the two transformers... and the problem moved to the other side. I suspect the left transformer to be bad. Unfortunately, the transformer is essentially unobtainium... I have to replace the entire inverter, which is available from China for £24.88. Not too bad, but would have preferred to swap the transformer directly.
This is the first Vestel I've seen that uses an FPGA on a sub-board... it seems to use it to translate the LVDS for the LG Philips panel... very strange indeed! It confuses me that they would cut so many corners on the caps inside the unit and then stick a somewhat expensive Xilinx Spartan FPGA inside it!
Will update with video on repair soon.
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