problems with video output from scart socket with mine Philips MNS 8280 msx2

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Door andallaco

Master (136)

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21-03-2021, 14:41

Hi, yesterday I opened my Philips mns 8280 to do some internal cleaning, removed only the upper house, cleaned with the compressor from the dust. But when I reassembled the computer and connected to the TV, the latter does not detect any signal! Msx2 turns on, checks the floppy and responds to commands such as: load "cas:", r, the relay is activated to control the recorder, but does not display anything on the monitor .. do you have any advice for me? Thank you

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Van Repair-Bas

Paragon (1125)

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21-03-2021, 16:21

Please try the fuction-key F6 when the computer is turned on and after the drives have flashed

Van Meits

Scribe (6446)

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21-03-2021, 16:56

If your computer does show the MSX splash screen and goes black afterwards, do what Repair-Bas suggested.
I've never checked the inside of a 8280, but its two younger sisters have a little white switch for testing purposes on the mainboard. Which should be visible right behind the center of the diskdrivesbracket. It might be obfuscated with cables, but dig a bit. If it's there, you might have accidentally touched it, so check what happens if you press it again.

Then there's the cable/screen thing. Be sure they are good. Test with another cable. And if you disassebled your 8280, be sure you reconnected every cable to the right socket and that the SCART connector is not hanging loose (cold solderjoints).

Van andallaco

Master (136)

afbeelding van andallaco

21-03-2021, 20:15

thanks for the replies.
I don't remember flipping a switch, I can double check. Unfortunately at the moment I don't have another scart cable, however the one in use is new and I don't even have another monitor to test. my mns8280 turns on, tests the floppy drive and if I insert a floppy with a game it loads it, but unfortunately nothing appears in the nonitor, not even the initial writing and no audio is heard, no signal indicates the monitor.
The problem started after cleaning, which was very light, only with air and I didn't disassemble any electronic card inside. We should check if there are output voltages in the msx scart, but I'm not a great expert ..
I'm so sorry, I have to be able to make it work again! Thank's
I can't attach photos ..

Van sdsnatcher73

Prophet (2231)

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21-03-2021, 20:58

Can you use the composite output and see if you get an image through that? You can use any red-white RCA stereo cable for this.

If the MSX loads the floppy the test switch is no issue (that would disable normal boot procedure).

Van Meits

Scribe (6446)

afbeelding van Meits

21-03-2021, 22:06

If the drive works, this white testbutton has not been pressed.
On top of what sdsnatcher73 mentions you could try the RF (antenna) cable as well... It has horrible output, but I guess up to now every TV has that input. You'll just have to scan for the right channel when you have the MSX connected to the TV while it's on.

Van andallaco

Master (136)

afbeelding van andallaco

22-03-2021, 00:14

I tried to connect my nms8280 through the antenna cable, but I could not find the channel to view the msx2 image. I have not tried with two rca audio and video out cables, eventually I will also check this. However, the fact remains that the scart socket suddenly no longer works!

Van Repair-Bas

Paragon (1125)

afbeelding van Repair-Bas

22-03-2021, 08:54

I think the switches or sliders are not in the right position.
Please try a cartridge.

You can also contact me and we can have a videochat by whatsapp or messager and we solve your problem

Van andallaco

Master (136)

afbeelding van andallaco

22-03-2021, 09:17

Thanks Repair-Bas, you are really very kind! I am Italian, unfortunately my spoken and written English is not very good .. Tell me if you need some information to understand the problem.
Summary:
- After quick and light cleaning, via the SCART socket no signal appears in the monitor and does not display images or sound.
- I tried with the antenna cable to understand if, however, with other connections it is possible to display the status of the MNS8280 in the monitor, but unfortunately I have not found any channel.
- This morning I tried to connect with red and white RCA cables from the AUDIO OUT of Miov MSX2 to the monitor
TV AUDIO IN to check at least the audio output, but after loading ZANAC EX from Floppy, I don't hear any sound from the monitor, even with the original NEMESIS 2 cartridge I don't hear any output sound ..?!?!
I am desperate, I did not have to perform this light cleaning ..

Van Repair-Bas

Paragon (1125)

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22-03-2021, 09:41

There is a volume slider in front of the computer

Van Jipe

Paragon (1502)

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22-03-2021, 09:52

check if the cursor EXT <-> GRAPHICS is on graphics
the connectors on the MSX card have a code M for main board A for Video board
check if MX is on AX and ML is on AL

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