Re: Sony KDL-40BX400
I disconnected the ribbon cables between the T-CON and the LCD panel.
There is no 5-blink error code.
Sound:ok
Inverter board:ok
TCON or lcd panel problem?
Any schematic for TCON board with test points?
wwanderer
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Last Activity: 01-02-2024, 03:34 AM
Joined: 01-12-2012
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Re: Sony KDL-40BX400
Thank you budm for your answer.
Finally I am back to my first post.(The LF7 in position PS6401 on Power Supply Unit was open circuited).
Now:
TV turns on.
Sound ok.
Picture: see the attachment in my first post
I am getting 12.7 VDC at both end of the fuse on the TCON ,with ref to the chassis.
1.What test points for Voltages should I test on the TCON board?Any schematic?
2.In general, this model of Sony (Bravia) has problematic lcd panels?
So...Last edited by wwanderer; 05-08-2015, 08:03 AM.Leave a comment:
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Re: Sony KDL-40BX400
The smd fuse on the TCON is ok.
I have disconnected the TCON cable from the main board.The TV shuts down with the 5 led blinking code.
Can I force on the power supply unit?
Can I make any oher test in order to be certain that this is a panel problem?
Thank you...Leave a comment:
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Re: Sony KDL-40BX400
Thank you all for your answers.
Now the questions are:
1.Is it possible to test or the panel in order to be certain that this is the problem?
(When I made the removal trcick of the LVDS cable some pins were damaged and maybe for this reason the mainboard failed too.Wishful thinking..)
2.If I change the mainboard, the TCON and the damaged LVDS flatcable between the TCON and the mainboard and the panel has problem will these two boards be ruined?
I can't measure any voltages in these two...Leave a comment:
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Re: Sony KDL-40BX400
I read the pdf files you mentioned.
I tried to test he TCON board, with the removal trick of the flat cable board between Main board and TCON board.
Now, the standby led flashes 5x times and the TV stops.
No sound
No picture
No light from inverter.
Panel problem?
I removed the TCON board but the TV produces the same 5x led standby protection mode.
Any advice?
Thank you.Leave a comment:
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Sony KDL-40BX400
Hi to all
I am going to replace the TCON board .Does anyone had the same problem?
Sound: ok
Inverter backlights:ok
Picture: small flashing screen raster colored pattern rolling horizontally on the
upper part of the screen
(See the attached picture)... -
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