Sony KDL-40EX723 - 2 Blinks

[shepp]

hi all, just got this in, now it seems like a common fault but I cant seem to find the schems in the Service Manual

Ive found that the R6548 Ceramic Resistor of 0.1 ohm/1J6 has Blown - now before I change this I was wondering if I should be checking any thing else other than the obvious Transistors that normally short, ive had the meter on them all and nothing seems to be out the ordinary from what I can tell

any advice would be great

[zomi]

Re: Sony KDL-40EX723 - 2 Blinks

Have you checked the transistors ?

Its very unlikley thats just the ceramic resistor has blown.

[shepp]

Re: Sony KDL-40EX723 - 2 Blinks

Ive diode checked across them....

from left to right pins...... 1+2 I get 0.65v on diode and 2Meg ohm resistance
1+3 I get 0.17v on diode and 330K ohm resistance
2+3 I get 0.5v on diode and 2Meg ohm resistance

thats on both of them in the 2nd pic

[zomi]

Re: Sony KDL-40EX723 - 2 Blinks

Have you check continuity normally they short and the fuse goes..

[shepp]

Re: Sony KDL-40EX723 - 2 Blinks

hahaha yes thats what the resistance is in last post :-)

[shepp]

Re: Sony KDL-40EX723 - 2 Blinks

anyone know what the difference between a ceramic and a welwyn resistor is? and if it will be ok using that instead, cant find one of the little ones the same as pictured :-(

[budm]

Re: Sony KDL-40EX723 - 2 Blinks

That is the fusible resistor, so you have shorted out component on the output side of the resistor which will be the power MOSFET Q6101, 6104, 6701, 6702.
APS-293, APS-293(CH)
Pictures provided by shopjimmy.
http://www.shopjimmy.com/sony-1-474-300-11-g6-board.htm

[shepp]

Re: Sony KDL-40EX723 - 2 Blinks

just tested Q6701 and Q6702 and its 0 ohms across all pins will remove tomoz and retest :-)

I didnt test them I must of missed them 2, but thought Id tested them......doh!

thank you budm

[shepp]

Re: Sony KDL-40EX723 - 2 Blinks

Successfully fixed, thank you guys for all your help again

hope everyones had a great Christmas

[budm]

Re: Sony KDL-40EX723 - 2 Blinks

Thanks for the follow-up on the repair.

[mike4scuba]

Re: Sony KDL-40EX723 - 2 Blinks

Just repaired my Sony Bravia 40ex723

Similar fault on my Tv with the 2 blinking lights error code

Removed the power board from the Tv and found the fusible resistor and 2 mosfets to be the cause of the failure

The mosfets to be replaced are MPNSTP9NK50ZFP
The fusible resistor is a 0.5W 0.1 Ohm 1/2 WATT

All these items can be found on eBay for around £11 inc p&p