Sylvania LC320SS9 Flashing Green LED

[heavymachines]

Re: Sylvania LC320SS9 Flashing Green LED

well that o2 micro chip does the switching controls of back light and what not it looks like?.....would make sense it to be a possible suspect.... just need to figure out how to test it...doing some reading myself.....thanks for sticking with me on this one, quite determined to figure this one out....thou i have much too learn...

[budm]

Re: Sylvania LC320SS9 Flashing Green LED

From the look of the board on the bottom side, it looks impossible for me to trace out the connections, still amaze how many Diodes it has in the inverter section, looks like at least 25 small diodes.
So far no spec sheet except the one in the link I gave earlier.

[budm]

Re: Sylvania LC320SS9 Flashing Green LED

OK, I would like to find out if all the high voltage Inverter transformers are putting out the high voltage, you will need a Fluorescent lamp, solder a small solid wire to the bottom of the base to use it as a high voltage probe.
Remove one lamp connector at a time, with the TV off, hold the Fluorescent lamp in your hand then stick the probe to the socket just enough to touch the pin on the socket, then turn on the TV, you should see the Fluorescent should flash on to indicate that it is putting out high voltage. Turn the TV off and then do the next lamp sockets to see if all of them will flash on the Fluorescent.

[budm]

Re: Sylvania LC320SS9 Flashing Green LED

OK, after hours of searching, I found Philips TV that uses this IC OZ9926 for the inverter circuit. So check and see if pin20 has 24vdc voltage for the B+ for it to run.
If it does, then short out pin 13 (Lamp current sensor) to ground to see if the lamps will stay on.

[heavymachines]

Re: Sylvania LC320SS9 Flashing Green LED

OK, I would like to find out if all the high voltage Inverter transformers are putting out the high voltage, you will need a Fluorescent lamp, solder a small solid wire to the bottom of the base to use it as a high voltage probe.
Remove one lamp connector at a time, with the TV off, hold the Fluorescent lamp in your hand then stick the probe to the socket just enough to touch the pin on the socket, then turn on the TV, you should see the Fluorescent should flash on to indicate that it is putting out high voltage. Turn the TV off and then do the next lamp sockets to see if all of them will flash on the Fluorescent.

well i am certain that it does i already had this set apart and it will light all of its tubes for a good 1 1/2 seconds and very bright 1 1/2 second..... it has the u tube type come to find out....

[budm]

Re: Sylvania LC320SS9 Flashing Green LED

OK, Try shorting out pin 13 and see if it will stay on,or you may try new IC.

[heavymachines]

Re: Sylvania LC320SS9 Flashing Green LED

OK, Try shorting out pin 13 and see if it will stay on,or you may try new IC.

ok tried shorting out pin 13 to ground and nothing ..soldered a wire to pin 13 and pig tailed it to other side so i could mount board and do the test...and same results...


trying to figure out how how to test for 24 volts when board is mounted and powered on since the ic is on underside... probably have to solder a pig tail to that as well......

[budm]

Re: Sylvania LC320SS9 Flashing Green LED

Not sure if this inverter use 24v dc or not. What DC voltage do you get on that secondary DC filter cap? I believe you had replaced the Rectifier Diode in that section.

[tom66]

Re: Sylvania LC320SS9 Flashing Green LED

This inverter uses about 60V, I think.

[heavymachines]

Re: Sylvania LC320SS9 Flashing Green LED

Not sure if this inverter use 24v dc or not. What DC voltage do you get on that secondary DC filter cap? I believe you had replaced the Rectifier Diode in that section.

i will get readings for the dc filter cap ...i have not replaced any diodes at all in this set ...none of them are bad i tested them all ...i think your getting me confused with the guy that started this thread who did in fact change those 3 diodes because he had a short or open reading but the diodes on mine are fine and dandy....and same with another fella on here, his tested all good as well....

[Jerry7591]

Re: Sylvania LC320SS9 Flashing Green LED

yes mine are good also guys!

[budm]

Re: Sylvania LC320SS9 Flashing Green LED

This is an interesting test, thanks to johnboy1313:
http://www.bestelectronicarticles.co...ht-system.html

[heavymachines]

Re: Sylvania LC320SS9 Flashing Green LED

This is an interesting test, thanks to johnboy1313:
http://www.bestelectronicarticles.co...ht-system.html

okay well the chip is officially dead the test killed it ...now i get no flash anymore ...the dc filter cap tries to climb to 30 volts but something is driving it back down.....it will slowly climb to 30 volts for a split sec then dwindle down to 10 volts ...now i have 2 problems here....

[budm]

Re: Sylvania LC320SS9 Flashing Green LED

The IC only drive the MOSFET, so if it does not time out, then the MOSFET may be damaged and can also be that there is bad transformerds or somethng that was already bad finally failed when it is being driven and force on. The link indicated that one of the transformer got hot.

[heavymachines]

Re: Sylvania LC320SS9 Flashing Green LED

okay well the chip is officially dead the test killed it ...now i get no flash anymore ...the dc filter cap tries to climb to 30 volts but something is driving it back down.....it will slowly climb to 30 volts for a split sec then dwindle down to 10 volts ...now i have 2 problems here....

OZ9926 and OZ9938 are different in its pinout pin 3 short killed the OZ9926 oh well thinking about replace the whole inverter board however thats a gamble... could replace the oz chip however have a feeling i will just be back where i was with that one problem i started off with....

[budm]

Re: Sylvania LC320SS9 Flashing Green LED

It is what ever the TIMER PIN control is, so you used the same pin number but not the TIMER pin? The whole purpose is to kill the timer pin.

[heavymachines]

Re: Sylvania LC320SS9 Flashing Green LED

The IC only drive the MOSFET, so if it does not time out, then the MOSFET may be damaged and can also be that there is bad transformerds or somethng that was already bad finally failed when it is being driven and force on. The link indicated that one of the transformer got hot.

never can get it to stay on to see if it has a bad transformer ...wish i had a ring tester.....the oz chip did not fry into smokes but now i lost that brief flash i had......right after that test so i guess i assumed it killed the oz chip...then again it could have finally finished off what was failing the whole time ....

[heavymachines]

Re: Sylvania LC320SS9 Flashing Green LED

It is what ever the TIMER PIN control is, so you used the same pin number but not the TIMER pin? The whole purpose is to kill the timer pin.

did that got nothing but backwards now i have no flash at all.....

[heavymachines]

Re: Sylvania LC320SS9 Flashing Green LED

did that got nothing but backwards now i have no flash at all.....

also pin number 3 is not timer lol on this p.o.s, oh well found an entire inverter board for 35 buxs gonna try to talk him down.... see if i can just replace both boards since its such a pathetic excuse of a tv..... found the other board from same seller for 12 buxs lol its cheap enough to just replace it....P.O.S salvania also funai and several other brands have exact same setup as this ungodly turd.... diode haven....

[budm]

Re: Sylvania LC320SS9 Flashing Green LED

Well, lets us know if the new inverter board fixed the problem.
By the way TIMER pin for this OZ9926 is pin 15 as shown in post 64.
I was hoping that when you shorted out the TImer pin, the lamps will stay on.