Philips DVP3042 Distorted black and white video, not reading discs

[t0nito]

Hi I have a Philips DVD Player Model DVP3042 that I'd like to fix for my aunt.

She asked if I could fix it, she said it wouldn't read discs and there was no video. I though it could be a dirty lens and a bad cable.

I took it home and in fact the player doesn't load and on my setup the video is severely distorted.

First thing I've done is I cleaned the lens, I put a DVD in and it spins, albeit slowly and doesn't load, I found that the laser isn't even turning on, or even moving. Since there are problems in the video output, I thought it might be a power supply problem, I measured voltages and they are as follows with unit on and off:

Pin 1 +5V = 5.31V ON / 6.17V OFF
Pin 2 +3.3V = 3.38V ON / 3.39V OFF
Pin 3 GND
Pin 4 GND
Pin 5 +12V = 11.37V ON / 14.01V OFF
Pin 6 GND
Pin 7 -12V = -11.89V ON / -16.7V OFF
Pin 8 -24V = -23.18V ON / -25.2V OFF

I measured AC voltages to check for ripple, I get about 0.33VAC on all voltages.

It's quite intriguing, I think both problems are related.

If you could help I'd appreciate it.

Here's a photo of the distortion, though it looks blue it's actually black and white:

 

[Alec_t]

Definitely sounds like a power supply problem. Have you checked the usual culprits (electrolytic caps, mains rectifier etc)? Any sign of over-heating, scorch marks?

 

[t0nito]

Definitely sounds like a power supply problem. Have you checked the usual culprits (electrolytic caps, mains rectifier etc)? Any sign of over-heating, scorch marks?

Thank you for your reply, I haven't checked all of the capacitors, but the ones I checked were fine, capacitance and ESR wise, I guess I have to check every one of them one by one. There are no scorch marks, what I find odd though is that the voltages seem normal, and the ripple seems marginal.