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Repair tips

Make	Model	Problem	Solution	Date

Found: 5
JVC	AV28SD4EK	Brief burst of power then dead	LOPTx	14-09-04
JVC	AV28SD4EK	Dead, R526 burnt out C468/469 exploded	Replaced D521 BY228, D523 BYW95B R526, 39R D525 27v zener .	14-09-04

JVC	AV28SD4EK	Service mode entering	press "DISPLAY" and "VSN Standard" together & note settings While still in the service mode, press "Display" and "VSN Standard" again to enter the system constants menu. Now write down all the settings in the system constants menu. Press EXIT twice to return to the normal screen. Switch the set off and replace the EEPROMs with a new ones. Then go back to the service/system menu and enter all the data what you have written down. After all the items have been set, press "OK" to store.zbv	14-09-04
JVC	AV28SD4EK	Shuts down aft few secs	EEPROM faulty	14-09-04
JVC	AV28SD4EK MXIV	No sound and all programs show the same channel	Check the data lines on pins 14 and 13 of the connector CNO13 on the sound subboard. If they are low, disconnect the lines one by one from all the chips until the correct level is restored (about 4 V p-p). Also check IC001 5V regulator for DJs, as this could be the culprit. In this case all 3 chips on the sound board had leaky data line inputs:	14-09-04

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