kdl-52w4100 6 blink error issue need help

[jettboat]

I tested the screen seems to be ok it shows up while a bright lights directed at it, also did resistor to ground to remove the 6 blink inv err, still get no back light . The problem seems to be with power supply 395 pfc volts supplying the inverter boards is only 8.5 not enough to supply the inverters properly? I tested components on both inverter boards and power supply. They all seem good. I would like to at least get it narrowed down to the individual board that's at fault. I have fixed 60 or so lcd & plasmas mostly to component level but this ones frying my brain. Anyone with incite/help on this model? I do have access to o-scope, signal generator etc. I have the basic multi meter, esr, variable 15vdc ps at home. Its my first time posting pic hope there ok from my phone.

[jettboat]

Re: kdl-52w4100 6 blink error issue need help

I forgot to add that I get all voltages @ back light on 1.82v, dimmer 1.71v and all other connections seem good how printed on the boards, but pfc's 395v going to the inverter boards being very low. I have the service manual also, It states the inverter boards are the issue but, I find no problems on them at all. Was thinking of removing the pfc connectors then inject the 395v into them to see if there ok but I can't do this until Monday @ school & if its wise to do this or not?

[budm]

Re: kdl-52w4100 6 blink error issue need help

Are you getting only 8.5V at those two large 450VDC cap also?
Service manual:
http://elektrotanya.com/?q=showresul...oria=&kat2=all

[jettboat]

Re: kdl-52w4100 6 blink error issue need help

yes that's all

[jettboat]

Re: kdl-52w4100 6 blink error issue need help

Whoops! I was using the wrong ground. I do get 392 @ the pfc output now I need to make sure I didn't test wrong on other things.

[budm]

Re: kdl-52w4100 6 blink error issue need help

OK, that's better. Training manual for EX1 chassis.

[jettboat]

Re: kdl-52w4100 6 blink error issue need help

Thanks budm I had the manual already but it made me look at it again. Looking at the manual it is pointing me toward the main board, the inv err is normally high I thought it was supposed to be low like the bal err, whoops. I'm also only getting 1.8 for bl on and it should be 3.3vdc. after testing all the other inverter circuits and they were good had me lost. time to order a new board, I will update if it is good to go with a new one.

[jettboat]

Re: kdl-52w4100 6 blink error issue need help

Well the training manual lead me wrong its not the main bu board. I'm going to have to test the output of the inverters going to the balancer boards Monday. The trouble shooting flow chart was wrong! go figure well guess if it was easy every body would do it. lol On to the Panasonic sc repair for now.

[jettboat]

Re: kdl-52w4100 6 blink error issue need help

Ok here was the issue a 16v 100mf cap was shorted (odd) on the d5 inverter board tied to a IC on the back as there's only a couple caps there they all looked good, replace them all & another TV was saved.

[budm]

Re: kdl-52w4100 6 blink error issue need help

Glad to hear it is fixed.