EMERSON LF320EM4 A (serial number ME7 - TYPE F)

[amosfolz]

Hello all,

I have been trying to troubleshoot this Emerson TV and have not had any success. I would really appreciate any guidance as I am stuck on what to check next.

The issue is that the TV will enter standby mode with solid red LED light on front of unit after being plugged in. When pressing power-on button the red LED will flash 3 times and then power off and return to standby mode with a constant red LED.

I have tried working my way through the service manual and am stuck. On page 26 of attached service manual I am following FLOW CHART NO. 1. I have checked all components except T601. I am not sure how to check the transformer. Is it possible?

Tools available to me are a DMM and a Blue ESR meter.

I have also checked most of the capacitors on the board and they all are within range. (Assuming .15 would be acceptable for 330uf 200v cap?)

Here are the other components I've tested - D650, D651, D653, D655, IC602, Q1001, Q1003.

Referencing FLOW CHART NO.5 from the service manual, I am unsure what the correct procedure is to check P-ON-21V. It states "Is approximately +21V voltage supplied to the cathode of D650(D651)? My question is should I be checking this in standby mode or power on?

D650 is around 13.5v DC in standby mode and jumps to about 18.5 for a few sounds when I try to power on the TV.


Any guidance is greatly appreciated.

**Note that my TV is TYPE F in service manual.

[bobbyskillz]

Re: EMERSON LF320EM4 A (serial number ME7 - TYPE F)

I've got the same problem with the same model TV. My readings match yours exactly. Did you have any success with troubleshooting this? I'm going to pursue this more tonight.