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Hantarex Polo diagonal lines
buttersoft:
The pump-up cap will be an electrolytic. Hmm, in which case, did you test the caps before putting in? If it's not that, it might be related to the IC i guess.
If you can identify the vertical IC and get a part number, the datasheet for it should show a typical circuit, including the pump-up cap. You might be able to identify it that way, especially if you have the schematic for your chassis. Or the circuit might show something else that's relevant.
This is me speaking from limited experience though, i'd love it if someone who knows something about Hantarex Polos would chime in :/
KaYs3r:
I have already changed all the electrolytic caps for equivalent new ones. I already have a new vertical IC, I think I'll try to install it...
Thanks
KaYs3r:
So, I've changed the vertical IC, and problem persists.
There is another problem, that already happened before switching the vert IC, the shape of the image is changed depending if there is bright or dark colors on the screen.
Anything else I should try?
Thanks
buttersoft:
How is the shape changing? Bloom, or an the image expanding on bright screens, is normal. A lot of the time it happens depending on whether a scanline or section of lines is brighter - so the brighter (top/bottom/middle) section of the screen will expand, especially horizontally, but the darker sections won't.
I have to admit this is where my remote diagnosis ends, sorry. I don't know how to continue unless you can provide a schematic, and possibly the part number for the vertical IC. Even then i might not see anything. There are people on here with much more experience than me, so hopefully one of them has knowledge of your monitor, and decides to stop by in the next couple of weeks.
KaYs3r:
--- Quote from: buttersoft on January 19, 2022, 05:53:22 pm ---How is the shape changing? Bloom, or an the image expanding on bright screens, is normal. A lot of the time it happens depending on whether a scanline or section of lines is brighter - so the brighter (top/bottom/middle) section of the screen will expand, especially horizontally, but the darker sections won't.
--- End quote ---
Yeah, that's it.
--- Quote from: buttersoft on January 19, 2022, 05:53:22 pm ---I have to admit this is where my remote diagnosis ends, sorry. I don't know how to continue unless you can provide a schematic, and possibly the part number for the vertical IC. Even then i might not see anything. There are people on here with much more experience than me, so hopefully one of them has knowledge of your monitor, and decides to stop by in the next couple of weeks.
--- End quote ---
Here you go, I've attached the schematic, I don't know if it is exactly the same model, I see some different models of this chassis.
The vertical IC is the TDA1675a or TDA1670a (they are equivalent).
Thank you for your help