[jacek1313]

The capacitor added is parallel with R131.
The value is selected when measuring the oscilloscope to eliminate disturbance.

• This reply was modified 2 weeks, 1 day ago by jacek1313.

[jacek1313]

I had the same problem, I added a 33nF capacitor to input 5 of IC1.

[jacek1313]

I had such a case and the soldering of one of the windings in the engine was damaged. At 9V the engine worked and at a lower voltage it stopped. The LED goes out because the BS9000 resets due to lack of pulses. The engine is quite easy to disassemble.

[jacek1313]

File A3.1.0.11.37484_signed.xml

 

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[jacek1313]

Hello,
two options for turning on the TV without a remote control.

[jacek1313]

Hello, please

[jacek1313]

This is BL8002 but probably the same speakers.

[jacek1313]

In one Avant, one of the power supply transformers was squeaking; at first it seemed to be the loudspeaker. A piece of plastic and varnish solved the problem.

[jacek1313]

Masterlink comes from PCB12 IC4 (7,17) through PCB14 IC1-4 and IC8-9 (CD4066), so if there is no signal then PCB12 IC4 does not work or the AF or CD signal (12,13,8,9) does not reach it ). For tests, with the RADIO turned on, I would short input 12 (AF L) with output 25 through a 1kohm resistor. I think you checked all the power supplies, because there are quite a few of them.
Finger signal – you hold the screwdriver by the metal part and touch the elements, a sound should appear.

[jacek1313]

Hello, have you tried giving a “fingertip” signal to R93 and R91? Maybe you have the TR42, TR64, TR60-64 transistors driven, i.e. the MUTE signal from IC1?

[jacek1313]

PCB5 Digital Video Engine, IC500 SDA6000 supports PUC.

[jacek1313]

I had to replace the LCD screen. It is also possible that there is damage to the driver board under the LCD housing. Large selection of cables on Ebay.

[jacek1313]

In the BV10-32 I once repaired, I had a similar defect, a damaged LCD screen. You can disassemble the screen and check the ribbons connecting the T-Con – LCD screen.

[jacek1313]

These are photos from Avant 75.

[jacek1313]

This is the original capacitor from Beosystem 4.

[jacek1313]

BeoSystem 4 boards already use a 3300uF capacitor.

[jacek1313]

I don’t have any photos. I cleaned the PCB under the capacitor to bare copper, soldered the paths with thin wires and covered them with PVB varnish.

[jacek1313]

Hello, in my case the electrolyte from the damaged supercapacitor damaged the PCB paths that ran under it. I could barely solder them.
One of them is the signal from the IR module to the FEP IC300 processor.

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