Today we’ll be briefly looking at an old Philips 29″ CRT TV (29SX8771/75R). We’ve had this TV for at least 10+ years and I’ve been told that it cost $2,000 back in the day. The image has degraded a bit so instead of throwing this out, we’ll take it apart and harvest the parts.
Quite a lot of screws later and we’re in; there was 4 speakers which I took out for parts.
It’s very dusty, you can see the main board and the CRT with electron gun. I discharged the CRT by hooking up the plug coming from the CRT (anode) to ground.
I was hitting the electron gun with a hammer to break it off from the CRT as it’s all under a vacuum, luckily the glass didn’t break from the electron gun.
Here’s the main board with the 2 other PCBs, one of which was mounted on the electron gun. On the main board you can see the TV tuner on the bottom left, two riser boards to the right of that and far on the right you have the CRT high voltage transformer with metal shields around it.
On one of the riser boards I found a Philips PCF84C81A Microcontroller which is an 8 bit, 1- 16MHz with 8K of ROM and 256byte of RAM and a teletext video processor SAA5231 chip plus a teletext video decoder SAA5243 chip.
The electron gun was removed from inside this huge coil of wire (focusing coil) which controls where the electron ends up on the screen.
Here’s the electron gun, we’ll have a look into it a bit more. There were these rings around it which I broke one off, it’s slighly magnetic so I believe it may be used for more focusing.
A few more close ups of the electron gun.
I removed the outside casings so we can see it all, from what I’ve read the small metal cans are used to accelerate the electrons. And that’s all.
Reckon you can make a Portal Gun from it?
Heh, I don’t think I should 🙂
I’ll just leave it in storage somewhere and maybe one day I’ll need it for something.
How on earth can I tune this in. The AV works fine but I have some old rf gadgets at CH35
If I wanted to screw down my Philips CRT TV to a dresser or table where would I do that without hitting any wires through the bottom of the TV? It is a Philips 27PT6441/37. I have tried contact Philips but I am not getting anywhere with them. If the hotels can do it so can I.
Does this t.v. allow you to play an EBox 360? My little cousin is having trouble, it just shows a black box on the t.v….
If you have an Xbox 360 composite cable, it should work.
Very unlike today’s TVs. Manufacturers now put everything next to components that get hot and use barely sufficient capacitors that blow up very easily. You might think “well, replacing a capacitor is an easy task”, except they really want you not to and make it very hard for hackers to repair these things. Samsung is one of these bad manufacturers.
They don’t care, because they are the cheapest brand, they make their money on the quantity instead of the quality, like most companies.
Hi Alex
Those rings you mentioned breaking off were for setting the purity up when replacing the CRT or when first assembled.
you mayfind allot of wire wound pots on one of the panels which was for setting up Dynamic convergence , and carbon pots for the static convergence and Gray scale alignment but if its later chassis it wont have them
Normal use they were for adjusting when replacing CRT or if the TV had a bad knock.
The big coils you called focus coils are actually Scan coils, the thinner wire coil gives frame scan which is picture top bottom, without it or if O/C you end up with frame collapse (thin white line across centre of screen. The thicker of the wires is for the line scan which spreads the image horizontal , In the old days it was quite common for them either to go S/C which shut down the line oscillator , so no picture, sound only, Or if the customer was unlucky they would arc due to insulation breakdown and the EHT present would punch a hole through the neck of the tube.
In the 50s era they fixed magnets round the neck of the tube after early 60s they used electromagnetic like your model.
All the best
Dave
hi .i need help my tv just showing numbèrs but no vision or flocs wht cńi do its a philips old model dnt know series plź nd tnx
Do you still have the casing parts from this TV? I am looking for the speaker frame the left and right side, and the side cover. Mine is 29sx8771 model but look similar to your model, same problem as yours as the colour is deteriorating.
Kind Regards,
gcvoon