a. Possible problems
In general, there is possible to meet many problems, most of them are become from bad connection and mounting quality done by manufacturer as well as by You who assembling screen with controller.
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Most problem become from badly made LVDS cable.
When LVDS cable is connected and made by You, sometime is possible to see bad colors or bad colors quantity (like 256 colors only)
So be sure that cable is well soldered in proper signal order,
be sure that each pair is twisted and all pairs are gathered together,
many times when each pairs are separated or messed, the picture quality becomes low, when cables are gathered - picture become normal.
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Another often problem become from bad supply power unit.
Be sure to use 12V and at least 2A supply power ( 3A is much better) , when Amperage is lower is possible to get bad picture and repeatedly reset of all controller.
If power adapter getting hot - so it can not be used and replace it immediately.
Small proper supply units are available in many places and internet's shops,
but BEWARE - DO NOT buy THIS POWER UNITS those are very bad quality made, using refurbished PCBs adopted for new wall box. In series of few boxes, are different PCBs inside of each, and works different way with problems. I got this conclusion after testing and opening few of them in different conditions.
Other wall adapters I got from Ebay, works well with good parameters.
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To made good cable connections, I bought crimp tool, to made nice cables and connectors used with controller board, that really helps a lot with connecting all external devices, like inverters, keyboards, IR, etc. ... Such Crimping Plier good for controller's connectors size is available HERE
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Attention: Sometimes, when playing with firmware, if there be power cut/brake and flash memory not finish programming, than the board become dead.
To repair/fix the board, need to be reprogrammed SPI flash chip (small 8 leg chip) in any external SPI programmer.
To do that, we must unsoldering flash chip from board, put it into programmer and program the .bin file .
After program, resoldering chip in his place at board, the controller will become live, so is possible to start programming again.
Direct link for download chip content need for repairing TSUMV29 controller type only.
Direct link for download chip content need for repairing TSUMV59 controller type only.
Direct link for download chip content need for repairing TSUMV56 controller type only.
Direct link for download chip content need for repairing V53 controller type only.
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There are also problems done by manufacturer, those usually become from "China quality" .
Generally remote control problems become because of bad packing for delivery, remote is not separated from board and have badly scratched surface. Also some parts on board can be broken or missing.
In other way, remote have bad quality of plastic, is very sensitive and soft.
Bad working remote control, usually become from bad soldering quality in factory.
So, you can open it and check soldering quality for battery holders/connectors.
The funny problem was also with IR transmitting LED , was not soldered at all, as on picture below
And fix was easy by soldering iron, that how it should looks like after repairing
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If you lost IR receiver, or if there is not IR receiver in package, is possible to buy anywhere and use any IR receiver, with carrier frequency 38kHz
Such IR receiver is available HERE
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Another often problem, is connecting good/inflexible antenna cable to antenna input socket.
This socket is "soldered" only by a small drop of tin, so when we move/shake the strong cable, socket can simply break out.
As solution, use soldering iron and add much more tin at both sides of antenna input, as on picture below
That will made antenna input, much more solid and immune for any mechanical destruction.
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When having problems with audio like for example playing only one channel, check soldering of sound chip on board, simply reheat every chip leg one by one .
Same repairing, for any other possible board hardware malfunctions.