Backing Camera interference in well-lit conditions

[batang_raon14]

Patulong lang po ako dito. I recently purchased a backing/reverse camera similar to the one I used on my old vehicle (Chevrolet Optra), this the pic of the image of that camera before:


Getting a Sentra for a replacement of my daily driver, I bought the same HU and the same camera for the setup, unfortunately, here are some changes with the camera that I bought and the setup I had to change for the camera itself to work:

First, the camera I used before of the same model uses 12volts, as opposed to this one that just uses 9volts. I was hoping to replace it with the 12volts one, but the shop I bought it from has already had their supplier phasing that type out. So, as an alternative, I had to use a DC to DC adapter that I have to plug in the car's cigarette plug. To have no problem with seeing wires inside the car, I remedied the problem by buying a cigarette plug socket and wired it to the car's reverse/backing light. After installation, this is the result:

http://h1.ripway.com/agent47/MOV00134.3GP

There seems to be an interference. I tried to eliminate it by removing the DC to DC Adapter and just plug the camera directly to the car's reverse light. Since the voltage is too much (about 3+ volts difference), it won't work. So I had to reconnect it with the DC Adapter. Initially, I thought it was the adapter causing the problem, but upon arriving home the night after, it was working fine. The image is crisp, no interference whatsoever.

After realizing that perhaps it isn't with the DC to DC Adapter, I tried to reverse the car up to the wall. While it's still far away, the camera is still crystal clear, but when I come near it (and at this point the camera's image should be better since the light emitted by the reverse light is helping), the interference returns. One thing I noticed more is that when I apply the brakes, the interference strengthens.

At daylight naman, grabe talaga interference. Pero pag gabi, wala naman unless mailawan na talaga ng maigi ung camera. What could be causing this? First time akong naka-experience ng camera na magkakaroon ng interference pag nasobrahan sa ilaw. Tried buying another one just for playing devil's advocate that the camera itself may be defective, but the outcome is still the same. Magulo parin yung image kapag under well-lit conditions.

Sabi ng mechanic, possible daw na mahina yung ampere rating nung reverse light. Sinubukan naming i-tap na lang sa AUX Video-in ng HU yung camera at baka tumino na, pero wala rin. So, is it really with the ampere rating? Or may iba pang factor dito? Kasi sinubukan ko na rin na paganahin siya sa bahay by connecting it to a TV and plugging it in using its included AC to DC adapter, maayos naman kahit well-lit pa yung paligid. Any clue? Wala talaga akong idea kung ba't nagkakaganito eh, kasi nung ginawa ko naman 'to sa Optra ko nun di nagkaproblema ng ganito.

[StraightSix]

Mukhang galing sa DC-to-DC (12v-to-9v) adaptor ang problema mo. Wala naman kamong problema kapag nakakabit sa AC-to-DC adaptor, kahit maliwanag ang environment, kaya ibig sabihin OK ang camera.

Kuha ng voltmeter at i-check mo yung output ng AC-to-DC adaptor, tapos ikumpara mo sa output ng ginagamit mong DC-to-DC adaptor. Sukatin mo yung voltages habang naka-ON yung camera. Kung pareho lang ang output, may pumapasok sigurong noise (ex: ignition noise) sa DC-to-DC adaptor mo. Try mong gumamit ng 9v battery sa camera mo, habang nakakabit sa sasakyan yung camera ... kapag OK ang picture, yung DC-to-DC adaptor mo ang problema.

HTH

[batang_raon14]

Boss sige po subukan ko po mamaya. Thank you po.

Pero Sir tanong lang po, di po ba kung sakaling may noise na napasok,di po ba dapat na kahit low-lit conditions e may interference pa rin?

[StraightSix]

Boss sige po subukan ko po mamaya. Thank you po.

Pero Sir tanong lang po, di po ba kung sakaling may noise na napasok,di po ba dapat na kahit low-lit conditions e may interference pa rin?

Depende rin kung saan pumapasok at kung ano source ng noise. Unahin muna natin yung primary suspect, unless somebody else comes up with a better idea.

[batang_raon14]

Update: with much searching, I was finally able to buy a 12 volts camera para mairekta na. Problem still is present.

As a last resort, instead of tapping the rear cam to the rearview RCA slot of the HU, I plugged it into the AUX IN VIDEO instead. Presto! Problems gone.

Ayoko nga lang manual mode ung pagshift ng HU, and my only suspect now is either the RCA Out of the backsight or the wiring connecting the HU and the Reverse light (which triggers the HU to enter into reverse mode). Problem ko ngayon is identifying which is which.

Posible din bang magkastatic ang video na parang audio pag grounded?

[StraightSix]

Subukan mo rin yung 9v camera (with adaptor) sa AUX IN kung wala ring problema. Kung talagang sa REAR CAM IN ang problema baka pwede mo pang ipa-exchange yung defective HU. Dalawang 9v camera na kasi ang nasayang mo.

Mas problemado sa interference ang video pagdating sa wiring, cable requirements pa lang kailangan na ng magandang shielded cable. Pareho lang sila ng problema kapag grounded. Intermittent/loose connection pwede ring source ng noise.

[batang_raon14]

*StraightSix

Mukhang tayo lang naguusap. Haha...

Anyways, pinull-out na namin yung unit from the car kanina. Sa shop na mismo ng kaibigan ko tinest. Using stable electric current and with no other factor besides the HU and the camera, we were finally to isolate the problem. Seems like the problem lies with the REAR CAM IN plug of the HU. The problem now is with warranty claim. I've been negotiating with the seller kaya lang NR si loko. I'm planning to bring it to an electrician na lang and see if baka yung RCA lang ang may tama or grounded lang siya sa loob.

Question na nga lang ngayon eh, where could I possibly find such an able electrician?

[StraightSix]

At least you can prove to the seller that the fault lies with the HU ... yun nga lang mahirap palang kausap.

Personaly I don't think there's anything wrong with the RCA connector. If the connector is grounded or open, there shouldn't be any video signal at all. It's more like a part of the HU circuit not being able to handle the signal from the camera with whatever that affects it under different light levels.

Assuming there's nothing wrong with the connector ... If the HU is from a known brand, you may want to take it to it's own service center. Or look for the best TV technician you can find. Me, I'd rather insist on the vendor for a replacement HU.

[batang_raon14]

At least you can prove to the seller that the fault lies with the HU ... yun nga lang mahirap palang kausap.

Personaly I don't think there's anything wrong with the RCA connector. If the connector is grounded or open, there shouldn't be any video signal at all. It's more like a part of the HU circuit not being able to handle the signal from the camera with whatever that affects it under different light levels.

Assuming there's nothing wrong with the connector ... If the HU is from a known brand, you may want to take it to it's own service center. Or look for the best TV technician you can find. Me, I'd rather insist on the vendor for a replacement HU.

Same sentiments Sir. Kasi saken lang, kung ung connector nga ang may tama, kapag sinubukan mong galawin, dapat umaayos. Kaya lang hindi eh. Perhaps mahina nga yung IC na gamit.

I guess the best way is to just kuli-txt the guy.