Problem with the Maxent MX-26X3 Television

Maxent MX-26X3 picture problem

By Paeng99 on May 10, 2008

The tv picture is working okay for 5 minutes then the picture get fuzzy. The screen will have lines until no pictures. Please help.

- Guest
- 2 years ago
same problem; tv on for a few minutes, then lines, then no picture at all. i don't know how to do the removal of shields, etc. i didn't buy a tv so i could be a handyman

- fritzrichter
- 2 years ago
After 3 years mine did the same thing. I will have to look for that greed heat sink.

- Guest
- 2 years ago
Picture appears on power on. Then a min. or so in, the picture becomes scrambled, until there is no picture at all. Just audio.I've taken off the back panel, and the pc cover plate, physically inspectecd all connecting wires, but don't know what to do next.

Best Solution (1 of 6)

posted 2 years ago

rancher64

Rank: Apprentice
Rating: 98%, 3 Votes

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!!

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Solution 2

posted 2 years ago

seto

Rank: Apprentice
Rating: 88%, 18 Votes

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.

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Solution 3

posted 2 years ago

pimaz

Rank: Guide
Rating: 82%, 12 Votes

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.

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Solution 4

posted 2 years ago

twillden

Rank: Apprentice
Rating: 100%, 1 Votes

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.

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Solution 5

posted 2 years ago

sil2222

Rank: Master
Rating: 86%, 14 Votes

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.

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Solution 6

posted 8 months ago

ashes7149

Rank: Apprentice
Rating: 0%, 0 Votes

After reading the other solutions I took it a step farther. By placing a small 12v fan out of a small printer or in my case an old Cisco 2900 switch. This fan was mounted into the tin shield that covers the whole board. I piggybacked onto the other fan using telephone splice connectors. I also drill small holes in the plastic back cover and now it pulls the hot air out.

Now let’s see how long it will last.

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