When power is switch on, the two green LED lights up but the screen remain blank .. after a few seconds, two green LED switch off and the red LED diagnostic blinks 3 times... then 4 times ... then continue blinking 4 times.
Hi, this is main board failure and you will need to replace this vital board. you power board is fine but, it is unable to send a proper current through the main mother board due to the damage at hand.
Visit the site named 'Electro-help' for more details. Click this link. View it in "Timeslide" option, which can be selected from the drop down box menu by the [Sidebar] tag, at the top left corner of the display window. It will make search easy. There are more than 1000 posts to different brand TVs now. Pull up older posts there.
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Thanks Local wonder.. but I would like to correct ... model number is SONY KV29SF1. and this is the problem...." " " " " --> When power is switch on, the two green LED lights up but the screen remain blank .. after a few seconds, two green LED switch off and the red LED diagnostic lights up for 2 secs... then blinks 4 times .and continue blinking 4 times " . However, There are times that the TV will normally operate after switching on.. Suspect problem with Horizontal ckt - unable to generate horizontal sweep current to operate the CRT which is being sense by the microprocessor protective circuitry.? This is a guess... as I dont have ckt diagram .Please advise..
I studied Radio TV servicing but practice Control system engineering.. So I still understand quite well TV circuitry operation and can repair down to component leve -- given the correct information. l. I just need familiarity with the operation / function of the IC used in this KV29SF1 , service manual and ckt diagram will be very helpful. There is no Sony service center near our place so I have to fix the TV ..Will appreciate if anybody can e-mail me a copy of Schematic Diagram..
LED blink and no power and i need circuit diagram. my email address is [email protected]
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