Re: Emerson LC401EM2F Flashes "Digital Television" then goes black
This is the first opportunity I have had to get back and update this post. There is a spike on the error pin, but its just a quick spike. I didn't need a scope to measure that, just a meter that responds faster. I can't really give you any details about the spike other than its very quick and happens before the initial problem happens, so its probably more related to the device initially powering on rather than the device failure.
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Re: Emerson LC401EM2F Flashes "Digital Television" then goes black
Yeah, the inverter voltage jumps up to about 700v, it may reduce but the TV dies so fast it probably doesn't have time to register. As far as my meter being damaged, I think it will be OK. Its pretty well suited for use with high powered transmitters and other high voltage high frequency measurements. I work primarily in radio communications and information technology, but TV repair is a new experience for me. I am not thinking I will be liking this.Last edited by kf4lne; 09-20-2012, 11:18 PM.
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Re: Emerson LC401EM2F Flashes "Digital Television" then goes black
All readings were between .610 to .614 ohms. I got this TV in this condition. The power supply board had been previously replaced and I have both the old and new power supplies. There are 2 fuses on the inverter board, both test good. No blown caps and no obviously damaged components or discoloration from heat. Also, the inverter output runs about 700v for a couple of seconds during the time the screen illuminates, this is regardless of weather or not I have the lamps connected. Same problem happens on...Last edited by kf4lne; 09-20-2012, 03:45 PM.
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Re: Emerson LC401EM2F Flashes "Digital Television" then goes black
VIN is 23.3
ERROR is 0.8 then quickly drops to 0
ENA 2.5
VIN and ENA remain the same after the system appears to power off. Pressing the power button again causes those voltages to momentarily drop then come back up, almost as if pressing the power button is causing a "reset" effect.
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Re: Emerson LC401EM2F Flashes "Digital Television" then goes black
There are labels on each end of the cable. On the PS board they are as follows:
Top>Bottom
PWM-SEL
BL-ADJ
BL-SW
ERROR
GND (5 pins)
24V (5 pins)
On the inverter board, the connector is marked CON1,
Pins 1-5 VIN
6-10 GND
11 ERR_OUT
12 ENA
13 DIM
14 EX_DIM
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Re: Emerson LC401EM2F Flashes "Digital Television" then goes black
No, the device pretty much powers off. No backlight, no power indicator, no relay clicks or anything else. The sequence is like this:
Press Power> Relays click, power indicator flashes then solid, backlight comes on immediately followed by the words flashing in the corner, backlights and power indicator immediately go off and at the same time the relays click again. All of this happens in about 5 seconds.
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Emerson LC401EM2F Flashes "Digital Television" then goes black
I have an Emerson lc401em2f that will not fully power on. When the power button is pressed, the red light flashes for about a second or so then the screen illuminates with the usual glow indicating the inverter and lamps powered up, flashes something very quickly in the bottom RH corner of the screen then the lamps go out and it appears the device shuts down. I was able to make a video recording of the sequence and found the words that flash in the corner are "DIGITAL TELEVISION". The power supply board was replaced, and as best as I can tell all of the voltages that are labeled on the...
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