Hi,

I was working with a Samsung plasma tv PN50A650, which has a faulty Main board BN97-02210A. When I power on the tv the power supply relay keep clicking. Red led is on but it do not power on. No audio or video.

I followed the service manual and it is pointing to this mainboard.

Please any advice on how to fix this board. I verified for bad caps but none seems damaged. I want to try to repair the board before I replaced it.

Thanks

MAS

Re: ViewSonic VP201b

Hi Guys:

Thanks for the feedback. I test the board again and found that diode in position D602 in the bottom of the video board was shorted. I replaced that with a spare board I have but still the same problem. I have a voltage in this diode of 2.43 which is the input for IC601 and IC603. There is some output voltage from this 2 Ic`s but I don't know if they are ok. If any one knows the value of this diode in order to buy a replacement please advice. I notice that this board is making some noise near to IC401 but is very difficult to find from...

Re: ViewSonic VP201b

Hi guys,

I have one of that LCD VP201 that has the inverter fuses open. I replaced both with a 2A picofuse as explained in this post. Now the monitor powers and when it scans through the DVI-A, DVI-D, D-SUB it tells the message “No signal” and goes to sleep mode (amber light). It won't recognize any input into it. The amber light stays on and the monitor can be cycled on/off but I cannot get it to display anything in any of the inputs. I have verified in the controller board all the capacitors and they look ok and have good readings with a...