Re: SOYO (mt-prtpt3208nb) lcd tv garbled screen
Hi, I have a same problem with my 32¨ SOYO,I saved my TV for 2 years ,I bought a new board in USA and have the same proble, I check all voltages in power supply and the 5V is slightly high (in PCB marked 5V) 5.15v , I don´t have squematic or Service Manual, but I check all cap, at first sight all well, service manual or squematic are welcome , I have osciloscope, multimeter and counter , some help, maybe the new card have de same problem, maybe is the power supply I not sure right now , thanks
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Re: SOYO (mt-prtpt3208nb) lcd tv garbled screen
It could be a good idea, but it's unlikely to be your problem.
So it looks to be the main board as the OSD is unaffected when set correctly. Some video processing is going wrong. Exactly what, well that remains to be determined.
At this point I would say replace the main board if you can source one, if not then a repair will have to be attempted.Leave a comment:
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Re: SOYO (mt-prtpt3208nb) lcd tv garbled screen
Thank you tom66, you were right, it was set on halftone. The menu is now crisp and on top, nice to see. The screen image is still rough (as seen in this new pic), it has large pixel like squares flickering all over the screen. Would it be a good idea to replace those larger Hermei caps on both boards?Attached Filesif you find these attachements useful please consider making a small donation to the site
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Re: SOYO (mt-prtpt3208nb) lcd tv garbled screen
Since you are having the same problem with the OSD and the picture, It seems like the problem is either going to be in the Tconn board or the ribbon cables that go to and from it. Those items are common to both.Leave a comment:
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Re: SOYO (mt-prtpt3208nb) lcd tv garbled screen
I'm trying to think - maybe the menu has a "transparency of OSD" option and that is what is causing the effects on the menu?Leave a comment:
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Re: SOYO (mt-prtpt3208nb) lcd tv garbled screen
The effect is constant in all light conditions. Here's 2 pics of the menu with and without a background image. The menu appears to get partially absorbed into the background.Attached Filesif you find these attachements useful please consider making a small donation to the site
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Re: SOYO (mt-prtpt3208nb) lcd tv garbled screen
Can you show a pic of the "almost clear" OSD?
Also, does the effect appear on black/dark scenes, and if so is the OSD affected?Leave a comment:
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Re: SOYO (mt-prtpt3208nb) lcd tv garbled screen
I would change out the Tconn board. Just as a good guess.Leave a comment:
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Re: SOYO (mt-prtpt3208nb) lcd tv garbled screen
Thanks for the info tom66 (your input is greatly appreciated)
The slow to start thing ... I can hear a slight whine from the PS when it's trying to start.
I wondering if it could be a bad cap without noticeable bulging.Leave a comment:
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Re: SOYO (mt-prtpt3208nb) lcd tv garbled screen
No, the menus look much better but not as crisp or solid as they should look.
Any other ideas......anyone ?Leave a comment:
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Re: SOYO (mt-prtpt3208nb) lcd tv garbled screen
LDOs on main board
Start top left ....moving clockwize
1117-3.3sj ( 0, 3.28, 5.15 )
1117-1.8sj ( 0, 1.78, 5.15 )
78do5al eetka1 ( 12.36, 0, 4.96 )
1117-3.3sj ( 0, 3.28, 5.14 )
1117-1.8sj ( 0, 1.78, 5.14 )
78do5al eetka1 ( 12.37, 0, 4.99 )Leave a comment:
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Re: SOYO (mt-prtpt3208nb) lcd tv garbled screen
Here's a view of the screen. As mentioned in previous post it takes a few tries to start from a cold state but once it's been on it restarts as it should.Attached Filesif you find these attachements useful please consider making a small donation to the site
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Re: SOYO (mt-prtpt3208nb) lcd tv garbled screen
OK, I will do that. Thank you
I just now tried to turn it on from a cold start (unplugged state). The green led light came on but the screen didn't light up after 2 minutes. I tried again 3 times quickly, it lit up on the third try. What does that indicate?Leave a comment:
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Re: SOYO (mt-prtpt3208nb) lcd tv garbled screen
Ah yeah, so using the same vent, but a crap brand..
Anyway, an LDO is a voltage regulator. Basically: Voltage comes in, less voltage goes out. It drops the voltage to a specific value e.g. 1.8V, 2.5V, 3.3V.
I've highlighted some LDOs on the board. (Check the bottom too - there may be more.)
With the TV powered on. Turn your multimeter to the 20V setting. Test each pin of each circled regulator, and note the voltages. Also note down the part number written on the device if you can make it out. Post your results.
Then we can go from there and see if any regulators are bad. If they are, they can be replaced.Attached Filesif you find these attachements useful please consider making a small donation to the site
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Re: SOYO (mt-prtpt3208nb) lcd tv garbled screen
What are LDOs?
The biggest caps are purple Hermeis, the two mid sized ( center right) are brown Hermeis, the rest are black Hermeis.Leave a comment:
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