Originally Posted by whozaguy
Thanks ReplayAddict. I greatly appreciate your suggestions.
I removed the connector and had looked for a point on the motherboard where the red wire's pin was connected but couldn't find any. The motherboard is a multilayer board and the 34V trace is on an inner layer, so I had to check all over the board, especially on the tuner section. Also, the connector pin isn't burned but I suspect that it has become unsoldered to the board. Before I start unsoldering the pin on the motherboard, I think I should check to see if the pin is making intermittent connection to the motherboard by reconnecting the power supply cable and wiggling the connector while it's powered up to see if 1) the voltage drops from 50V to 34V or whatever and 2) see if the tuner gets powered and the video signal returns.
Still no video on my ReplayTV 4504. I tried to find where the #3
pin is connected on the main board but sadly I was not able to find where the #3
pin connects. I used my Fluke 87 multimeter on the its Diode setting and detected a REVERSE connection to somewhere on the board, indicating a diode or transistor, but I could not find the part. Yesterday I unsoldered the #3
pin, removed it and then resoldered the pin but it didn't correct the problem. And I opened up the tuner box, xxx, and probed on the board but couldn't find a connection to the #3
pin. After resoldering the #3
pin, I still get the "no video detected" message and I still have 50V on the #3
pin that apparently is supposed to be 34V. The board is multilayer and the trace for the #3
pin apparently is an inner trace on the board. Does anyone have a schematic for the 4000 or 5000 series ReplayTV's?