VCR Repair


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VCR Repair

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mill
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Mar 8, 2014, 11:40 PM

Post #1 of 4 (4351 views)
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VCR Repair	Can't Post

LG LV890 has been unplugged from the mains for a while but now it powers up for 2 seconds then turns off. It will even load a tape. Any ideas please?

(This post was edited by mill on Mar 8, 2014, 11:43 PM)

jts1957
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Mar 9, 2014, 12:54 AM

Post #2 of 4 (4338 views)
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Re: [mill] VCR Repair [In reply to]	Can't Post

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It will even load a tape.

It WILL?

Display(s), DVD, Tuner or external inputs working?

What electronic or mechanical troubleshooting experience do you have?
Test Equipment?
Soldering/De-Soldering skills?

As all the IC that is applied to VCR is controlled by IIC, mutual communication, if Vcc of IC is short or open
with detecting ‘Acknowledge’ data of the specific IC according to each power(5V, 5VT) & u-COM gets unable to
detect ‘ACK’ data.
u-COM regards this case as abnormal one and if it can’t detect ‘ACK’ data for a certain time(3.5 sec) the signal
of ‘Power Control’ and ‘Timer Control’ are switched to ‘Low’. As a result POWER Switching TR is kept from
generating heat and fire.

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mill
New User

Mar 9, 2014, 11:40 AM

Post #3 of 4 (4333 views)
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Re: [jts1957] VCR Repair [In reply to]	Can't Post

Thanks for your reply. Yes it does load a tape! It will even unload if you very quickly turn on and press the eject button. I am fully qualified for soldering etc. So basically it is going to be a psu fault (I have have come across similar issues where it was mechanical). I am trying now to find the service manual.

jts1957
Veteran

Mar 9, 2014, 6:18 PM

Post #4 of 4 (4332 views)
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Re: [mill] VCR Repair [In reply to]	Can't Post

Try Elektrotanya.

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