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Hanrarex polo 16:9 to normal 28 inch 4:3 possible? (SOLVED)
perjmolsen:
Hi
I have a Hantarex polo 16:9 chassis, for free from a friend.
I do not know the current state of it, but it should be dead.
But before I try to fix it, I would like to know if it is posible to convert it to a normal 28 inch 4:3
If it is what do I need to change?
Kind regards
Per
princess prin prin:
I've never heard of a 16:9 Polo. If the power and flyback transformers are the same as the usual ones it should be possible to convert it. Check for different values in the horizontal and vertical deflection circuits, especially the high voltage caps and anything else that looks different. Post pics.
perjmolsen:
Pictures
perjmolsen:
Flyback
princess prin prin:
Thanks for the pics. Now I remember that around 1992-93 widescreen TVs started to appear and some Italian cabinet manufacturer made 16:9 cabinets thinking the format would have become popular in the gaming industry too but as we know that didn't happen so they quickly disappeared. This monitor still made by the original Hantarex must have been in one of those cabs.
Anyway, the power transformer (Eldor 2082.0743) is the same as the 25-28" but the flyback is different. 25-28" use Eldor 1242.5001 and this is 1242.5004 (= HR7369). The only difference I can see is that .5004 outputs a higher anode voltage because it was required by the bigger 32" (W76...) tubes (see the max. 32KV on the label where the 25-28" have 27KV). So this flyback on a 25-28" monitor will likely trigger the X-ray protection.
The HV caps in the horizontal circuit are the same except for C170 (270nF vs 330nF) which is used for S-correction and that's to be expected since widescreen tubes obviously need more correction than standard ones. Linearity and bridge coil would need to be checked but I don't think they're different. R219 has a higher value (3.3K vs 2.2K). You would need to go through the chassis and compare resistor values with the 25-28" schematics as there could be some differences in the vertical deflection and heater.
All in all it shouldn't be too hard or expensive to convert this chassis to a 25-28".