11ak30 chassis

b ha escrito:

For the record: replaced HOT BU808DFI, and LOPTX (HR 7950), also 10uF 63v horiz drive cap and 8n2 cap across HOT. Set now works.

-B.

hi I am newby in tv repair, sory for stupid questions, what did you meen when you say HOT? and when you say : cap and 8n2 cap across HOT.

Thanks....

jonhyr19

hi I am newby in tv repair, sory for stupid questions, what did you meen when you say HOT? and when you say : cap and 8n2 cap across HOT.

Thanks....

jonhyr19

jonhyr19 ha escrito:

no need to apologize. if everyone simply asked for information or help whenever they didn't know or weren't sure about things, the world would be a better place!

Thr HOT= HORIZONTAL OUTPUT TRANSISTOR aka LINE OUTPUT TRANSISTOR. CAP= capacitor, in this case i changed two. One electrolytic type in the horizontal drive circuit (apparently prone to failure on this chassis) and also another polyester film type, value 8n2 , connecetd c-e across the aforementioned HOT transistor. see

and

tv troubleshooting section.

going back to the above parts, I usually test or change these parts first of all in any set with shorts or other problems in the horizontal stage, before moving on to the more expensive transformer. They suffer a lot in use and are generally (relatively) cheap and easy to get hold of.

hope this helps.

-B.

Hi again

I have two tvs with problems one with 11ak30 and 11ak30-1

on 11ak30-1 i replaced HOT BU808DFI, and LOPTX (HR 7950), and all ok problem resolved

on 11ak30, nothing apend, the aparent problem, the tv stay on standby and the red light flash, and a sound with the flash, if you toutch in any boton the light pass to green and again in red, and noting apend.

HOT BU808DFI, and LOPTX (HR 7950) are ok, what seems to be the problem?

jonhyr19

jonhyr19 ha escrito:

sounds like there is something shutting down the power supply. first, check the voltage on the HOT. unsolder the HOT and connect a

60-100 watt bulb across c-e terminals.switch the set out of standby to ON, see if the bulb lights and is steady.

-Set your voltmeter to DC and put the red probe on the c, black to e. measure the voltage (should be between 115 and 130v depending on size of screen). try replacing the 160v capacitors in the b+ line from the power supply if it is not.These sometimes fail causing this problem.

-try also unsoldering the outputs from the line transformer, and power supply transformer one by one to see if there is one shorted bringing down the power supply. (vertical, RGB, etc etc.)

note that these are all very general tests, see

for more details. it's a bit hard to be more specific over the internet, without seeing the TV set!

regards, B.

of

showed

slightly

to

When i put the bull in c and e something in HOT die and the light of standby desapear..

jonhyr19