Maxent MX-26X3 picture problem

We followed the advice of seto, & it worked! Removing the stand (it slides out of the back) was also necessary. We also carefully vacuumed the dust out. Thank you, thank you!!

someone gave me a maxent mx26x3 with the same problem. I took the back cover off, and then the metal shield covering the PC board. There is a green heat sink on the main processing chip. The heat sink was not making good contact. I slightly twisted and pushed the heatsink on the the chip, and the picture stayed perfect now for 2 days. I think the heatsink will eventually need to be re-glued on with thermal expoy glue. It will be a pain to remove and clean though.

sil2222 is right about the problem being in the solder joints. I have fixed several of these by using my hot air solder station. You have to put pressure downward with the handle of a screw driver while reflowing the solder and keep the pressure held until it cools. Do all four sides one side at a time. Do not allow all four sides to flow at once or the chip will shift.

I had lines running down the screen so I also took that back cover off with the mx26x3 and the green heat sink had come loose. I twisted it and pressed it back on an it seems to be working again.

the heat sink is not the real problem i tried this fix and it worked for a week and then became worse the connectors on the chip under the heatsink become disconnected due to heat and lack of ventalition the only real fix is to re-solder those tiny connectors which can be done but is quite difficult you have to use special equipment just to see them clearly.