Yet another Sony PSOne Screen Problem

imapaintballa · Post by **imapaintballa** » Fri Dec 30, 2005 12:20 am

Today I accidently reversed the polarity going into the screen, so i bypassed the fuses. Now all i see is a black lcd screen, with no backlight nor sound. What should I do? Im not tooo concerned about the backlight, but the lcd and sound are what Im really worried about. Thanks!

usbcd36 · Post by **usbcd36** » Fri Dec 30, 2005 1:42 am

Well it could be simply that you fried it (or you're just not getting power to it

), but my guess is you bypassed the fuse that shorts 7.5v to ground if you happen to do so. Only one of the fuses is meant to have electricity flow freely through it, the others should not be shorted.

imapaintballa · Post by **imapaintballa** » Fri Dec 30, 2005 7:23 am

well s***, is there anything i can do? i see a black screen when it powers up, but not sound or backlight.

segasonicfan · Post by **segasonicfan** » Fri Dec 30, 2005 8:46 am

impaint, I've done the same thing many times, heh. Your screen/LCD is probably fine (always was in my case) but I'm suprised to hear it damaged your amp. Check the 7805s to make sure theyre both outputting correctly. and wire in (by that, I mean 3 wires) a headphone jack because the audio amp powers the headphone jack differenly (internally) than the regular speakers. If you get headphone sound but not speaker sound I have a fix I devised. Let me know and I can tell you the fix (not hard).

ALSO: To prevent this problem in the future ALWAYS have a 1N4001 Diode on hand. If you connect it in series with the power input to the screen it works as a polarity protection circuit!

The Anode side faces the screen input if I remember correctly..

-Segasonicfan

imapaintballa · Post by **imapaintballa** » Fri Dec 30, 2005 10:29 am

thank you so much!

[Double Post Merged by nos_slived]

ill be heading up to radioshack today to get some diodes, switches, and a new tip for my iron. i also need to figure out how to wire up the headphone jack.

[Triple Post Merged by nos_slived]

evrything is good, backlight lit up and i see an osd. thanks for the help anyways.

Metroid fan · Post by **Metroid fan** » Fri Dec 30, 2005 10:07 pm

usbcd36?!?! is that you!? Wow i haven't seen you in forever anyways...
Good job in fixing it!