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LG RC689D DVD Video Combo Repair
A customer asked me to visit their house for a series of faults with their electronic units. They own 2 TV’s – one in the kitchen and another in the lounge connected to a LG RC689D DVD/Video Combo unit. All of these appeared to have failed. They had the DVD player the night before, watching a friends’ DVD, but the next day it refused to start and the DVD was now stuck in the drive & they were panicking as the disc was not theirs.
I arrived at their home to follow up other complaints. They stated that not only had the DVD/VCR stopped working, but both their TV’s would not work. It always pays to get accurate information from a customer before beginning work.
Both their TV’s worked, but one had lost its channel settings. The customer now told me that she had pressed the wrong button on the remote and then all hell broke loose! She decided that the best way to solve the problem was to madly press all the other buttons! OK – a simple solution. Rescan for all the channels and set up the correct input. Problem number 1 solved.
Next problem – the second TV. This was wired with the aerial through the DVD/VCR player and onto the TV via a HDMI connection. I bypassed the player and inserted the aerial directly to the TV. All is not lost – Everything functioned on the TV correctly. Problem number 2 solved.
Don’t you wish all repairs were that simple? No such luck….
Problem number 3…….
It was obvious that at the heart of this TV’s problem was the DVD/VCR combo player. It had its normal standby light when turned on at the power point, however, when the unit power button was pressed, the word ‘HELLO’ would scroll across the display and go no further.
I decided the only unit I needed to take home was the player for further inspection.
On the test bench, I decided that the first priority was to remove the disc as the customer was very nervous about it being damaged. After removal of the top cover of the DVD drive, the disc was safely set aside and the work continued.
A thorough visual inspection was carried out and the usual suspects were identified. 2 capacitors were seen to have bulges, so it was obvious that they were faulty.
The second bulging capacitor is hidden from view…..
The next step was to identify the voltages at the secondary outputs. Removal of the HDMI circuit board was required to access the secondary output terminals.
Several were found to be low, together with some grounds that were not being totally pulled down to zero.
This particular voltage was low at 1.7 volts – it should read 2.5 volts
After draining the main filter capacitor, the power supply was now safe to test.
The Blue ESR meter was used to determine the health of all the capacitors.
After testing, 6 capacitors were found to be faulty and needed replacement. Where possible, capacitors with a higher voltage rating were used as replacement components.
After replacement of the faulty capacitors and reassembly of the unit, voltage testing of the secondary outputs was carried out.
A previous reading of 1.7 volts was now at 2.5 volts. Other voltages were all now within specifications.
Even ground readings were more consistent.
Several loose terminal connections were found and after tightening these connections, correct terminal retention was achieved.
When turned on, the unit had the word ‘HELLO’ stable and no longer scrolling across the display.
Although I did not have a video cassette to try in the player, a thorough testing of the DVD side of the unit showed the repair was completed successfully. The player was tested for the full length of a movie and all other features, including the remote control worked correctly.
If you are interested in this repair, you can see a video on my channel following the link below:
This article was prepared for you by Mark Rabone from Australia.
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Note: You can check out his previous repair article below: