I picked up this Vizio E400i-B2 with no stand-by light and diagnosed it with missing stand-by voltage. I found a Power Supply at ShopJimmy, installed it but it didn't work properly. SJ refunded the transaction and did not ask me to send the board back.
So I took some voltage readings upon the original board. Here's what I found:
Main caps have 169.9v
AC detect voltage is 1.3v
None of the MOSFETS appear to be short.
The opto (IC106) that appears to have something to do with stand-by voltage has 3.0 volts on terminal 1 and 1.0 volts on terminal 2 on the hot side of the PS. No voltage is present on the cold side of IC106. Terminal 4 of IC106 traces to Q206 which traces to both stand-by terminals via the center pin. I'm not sure if this has anything to do with the problem.
I'd like some help diagnosing the problem please.
So I took some voltage readings upon the original board. Here's what I found:
Main caps have 169.9v
AC detect voltage is 1.3v
None of the MOSFETS appear to be short.
The opto (IC106) that appears to have something to do with stand-by voltage has 3.0 volts on terminal 1 and 1.0 volts on terminal 2 on the hot side of the PS. No voltage is present on the cold side of IC106. Terminal 4 of IC106 traces to Q206 which traces to both stand-by terminals via the center pin. I'm not sure if this has anything to do with the problem.
I'd like some help diagnosing the problem please.
Comment