sanyo no back ligth

[budm]

Re: sanyo no back ligth

Same issue with the same model as the original OP? If it is it may be better to start a new thread as this one is getting long. Make sure to upload good clear pictures of your boards.

[tionne4u]

Re: sanyo no back ligth

was this ever resolved? the same issue has bought me here as well, I have the same model and same issue TV powers on and you can hear sound but no backlit. I also see the picture with a flashlight.....Thanks everyone.

[jazpa]

Re: sanyo no back ligth

[yes i can

[selldoor]

Re: sanyo no back ligth

Can you also see a dark picture as in post 1

Have you done all the tests mentioned in this long thread.
Can you take better photos than the original poster

[jazpa]

Re: sanyo no back ligth

Yes i have a sanyo dp42849 and i have this problem i have sound and everything no black light check my voltage from that and i have voltage but when i check my fuse r322 i dont have 3v but i can chek it with the beep on and it beeps also i check c821 when its off it drops from 170vdc on down instead of when i turn it on it should jump to 380-390 vdc but it onlys goes to 170

[MisterD]

Re: sanyo no back ligth

If you don't want it, ship the TV to me, I'll take it and keep it for myself and finish the repairs. Thanks.

[bohaboha]

Re: sanyo no back ligth

out of to topic i have to do it Thank you to all of you budm,tom66,seldoor and MisterD you are just fantastic and happy new year i hope he will be back after all that effort once again thank you

[MisterD]

Re: sanyo no back ligth

What a time to quit after bud has done all the hard work helping you out.

[ealequi]

Re: sanyo no back ligth

i was cheking the reading in this tv and now the tv turn off every 5 second. It is time to said like an familiar boxer said NO MAS!! You guys are champions. I'LL BE BACK!

[ealequi]

Re: sanyo no back ligth

ok iam ready

[ealequi]

Re: sanyo no back ligth

ok give me a minute

[budm]

Re: sanyo no back ligth

All those solder pads for the SMD Zener, transistors, resistors are on the bottom side of the board, you cannot access them from the top side of the board.

[ealequi]

Re: sanyo no back ligth

ok, is the testing on the green part of the board or on the top part?

[ealequi]

Re: sanyo no back ligth

ok give me a minute

[budm]

Re: sanyo no back ligth

OK take the DC voltage reading next. With TV plugged in and power switch activated.

[ealequi]

Re: sanyo no back ligth

ok this is what i got zd601 =.6, pin 16 on IC 301 with ground on c821 = beep but not reading, Q602=.6, Q303=.6 on e, 1.7 on b, R603 and R320 beep but not reading. Nothing, not even beep on C809,C808,R805,R806,R807

[budm]

Re: sanyo no back ligth

Unplug the TV from the outlet to check when checking the resistance.
And by the way, what are the IC P/N I request so we will know what operating voltage on pin 16 should be (now I assume that the line I trace from the pictures is correct)

[MisterD]

Re: sanyo no back ligth

Please read post 168, turn on TV to check voltages, turn off TV to check resistance.

[ealequi]

Re: sanyo no back ligth

Okay, Did you hook the negative probe of your volt meter to the negative lead of the Capacitor C821 on the power supply board? it must be hooked here for the ground connection otherwise it will not give you any voltages, and please leave it there for checking these voltages bud has asked for? these are DC Voltages not resistance.

yes i did

[tom66]

Re: sanyo no back ligth

Board should have no power applied when testing diodes or resistances.