Sony Bravia KDL-46EX640 no power

[bullwinkle]

Re: Sony Bravia KDL-46EX640 no power

I think my plan is bad. Sony website states you cannot revert to previous firmware version.

[bullwinkle]

Re: Sony Bravia KDL-46EX640 no power

Any suggestions?

[holmzy]

Re: Sony Bravia KDL-46EX640 no power

I have a 52ex703 and for the life me could not figure out how to change the model version. Im 100% certain it is possible on my tv as its the exact same board for 7 different size models and even the service manual states change to your panel type but does not show you how which I find very sneaky! somone must know how to do it or get into the hidden menu like on samsung tv's

[holmzy]

Re: Sony Bravia KDL-46EX640 no power

also 1 firware update affects all these TV's

KDL-32EX403 / EX500 / EX501 / EX503 / EX505 / EX508 / EX603 / EX605 / EX700 / EX701 / EX703 / EX705 / EX706 / EX707 / EX709 / EX710 / EX711 / EX713 / EX715 / EX716 / EX717 / EX719 / NX503
KDL-37EX403 / EX500 / EX503 / EX505
KDL-40EX403 / EX500 / EX501 / EX503 / EX505 / EX508 / EX603 / EX605 / EX700 / EX701 / EX703 / EX705 / EX706 / EX707 / EX708 / EX709 / EX710 / EX711 / EX713 / EX715 / EX716 / EX717 / EX718 / EX719 / HX700 / HX701 / HX703 / HX705 / NX503
KDL-46EX403 / EX500 / EX501 / EX503 / EX505 / EX700 / EX701/ EX703 / EX705 / EX706 / EX707 / EX708 / EX709 / EX710 / EX711 / EX713 / EX715 / EX716 / EX717 / EX718 / EX719 / HX700 / HX703 / HX705
KDL-52EX700 / EX703 / EX705
KDL-55EX500 / EX503 / EX505 / EX710 / EX711 / EX713 / EX715
KDL-60EX700 / EX703 / EX705

[bullwinkle]

Re: Sony Bravia KDL-46EX640 no power

been busy lately but will accept suggestions. will update once i have time to check the mainboard again

[bullwinkle]

Re: Sony Bravia KDL-46EX640 no power

still no progress. need help

[bullwinkle]

Re: Sony Bravia KDL-46EX640 no power

additional pics added for more infos:

[bullwinkle]

Re: Sony Bravia KDL-46EX640 no power

More infos regarding service menu:

[bullwinkle]

Re: Sony Bravia KDL-46EX640 no power

As you can see the model name is KD556EX640 but my TV is KDL46EX640 and the Main Power registers 001. Any suggestions?

[holmzy]

Re: Sony Bravia KDL-46EX640 no power

looks like u got the right panel number, i think the model names does not matter since the panel is right. looking at the service menu i can see at least one setting that conflicts with yours. match it according to the manual. but honestly i think one of your cables to the t-con / mainboard might not be in properly. doesnt to clean and reconnect

[bullwinkle]

Re: Sony Bravia KDL-46EX640 no power

ok many thanks. will update once I have time.

[bullwinkle]

Re: Sony Bravia KDL-46EX640 no power

@ holmzy: can you please point out what parameter do I have to check?

[bullwinkle]

Re: Sony Bravia KDL-46EX640 no power

This is the result if I put high values on brightness, contrast, etc.

[bullwinkle]

Re: Sony Bravia KDL-46EX640 no power

Any suggestions?

[tibimakai]

Re: Sony Bravia KDL-46EX640 no power

In the error log, it seems like you have a main power error(001). I'm not an expert, but I would check all the voltages to make sure that is all fine and I would clear that error.
I would try adjusting the LVDS level.
I would measure gamma voltages on the T-con board also.

[bullwinkle]

Re: Sony Bravia KDL-46EX640 no power

@ tibimakai: thanks for your input. I have problem saving the LVDS level. It keeps on going back to 25 even if I set it at 20.

[bullwinkle]

Re: Sony Bravia KDL-46EX640 no power

Here are some DC voltage outputs at the T-Con board:

Vss-7.5V = -7.57V
Vone_28V = 27.92V
AVDD_17V = 16.95V
HAVDD_8.5V = 8.50V
Vss1 = 0.044V
Vss2 = -7.56V
VDDAPLL_12 = 12.06V
VDD12_core = 1.20V
VDD12_AIPI = 1.204V
DVDD12_AIPI = 1.204V
VDD12_LVDS = 1.204V
INB+ = 1.085V
INC+ = 8.45V
WP = 3.342V
SCL = 3.327V
SDA = 3.328V
VOFFE = -11.96V
-INA = 7.27V
OUTA = 7.28V
HAVDD_2 = 8.5V
VCC_3.3V = 3.34V
VCC3.3_LVDS = 3.332V
VDD33_TTL = 3.336V
HAVDD_1 = 8.5V
VCC_1.8 = 1.87V
VCMOS1 = 7.27V
VCMOS2 = 7.27V
VrefL-L = 0.71V
VrefU_L = 8.05V
VrefL-H = 9.46V
VrefU-H = 16.24V
Vin = 12.35V
VGMA18 = 0.7V
VGMA17 = 3.188V
VGMA16 = 3.888V
VGMA15 = 4.288V
VGMA14 = 4.66V
VGMA13 = 5.35V
VGMA12 = 5.71V
VGMA11 = 6.19V
VGMA10 = 8.05V
VGMA9 = 9.47V
VGMA8 = 11.18V
VGMA7 = 11.62V
VGMA6 = 11.95V
VGMA5 = 12.58V
VGMA4 = 12.92V
VGMA3 = 13.29V
VGMA2 = 7.80V
VGMA1 = 7.27V

[budm]

Re: Sony Bravia KDL-46EX640 no power

VGMA 1, 2 Voltages are bad.

[holmzy]

Re: Sony Bravia KDL-46EX640 no power

if VGMA 1,2 affect colour it would be interesting to run a test program. like i stated previously I had this issue on samsung and the cables were not seated properly even though they were in snug!

[budm]

Re: Sony Bravia KDL-46EX640 no power

Tom's spreadsheet:
https://www.badcaps.net/forum/showth...ma+spreadsheet