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k15a tv no power chassis, standby led on
124
hace 5 años
hace 5 años
Good morning, I got a shasis K15a
a whistle is heard in the choper
Remove the flyback follow the whistle in the choper.
IN STANDBY: 1: D802 125V. TUNEN 33V OK
2: D814 12.5 to multiregulator pins 1 and 2. ok
3: multiregulator pin 9 5volts feeds microprocessor, eeprom,
waiting for the order that arrives pin 4
When giving power the LED flashes, and tries to turn on without achieving it.
any solution.
diagram: https://elektrotanya.com/samsung_ct3338-chasis-k15a_sm.pdf/download.html
Operation of the Samsung Chassis K15A TV
http://diagramasde.com/diagramas/otros2/fte_k15.pdf
17.741
hace 5 años
You already loaded the unlinked source of the flyback and continue with that whistle?
Did you change the primary and output filters?
17.741
hace 5 años
Check that the bulb and its circuit are working well first.
Because it's weird to turn on the st and a half 125v.
Check that first. Then take a good look at the spotlight and see if the ST has and mode in that state the source output voltages. Do not give PW.
Comment
46.781
hace 5 años
hace 5 años
Change electrolytes in the primary part of the source and + B filtration.
Check that there are no leaks in the components of the auxiliary sources in the secondary of the Chopper transformer. even the optocoupler
46.781
hace 5 años
If you have another option just change it to discard.
Check the good condition of the diodes and small electrolytes in the primary part of the source
46.781
hace 5 años
Having fully checked the polarization components of the iC in the primary stage including the error amplifier circuit It would be necessary to change the oscillator IC of the source
9.501
hace 5 años
hace 5 años
hello colleague: provo raising the tension of 12.5vq, goes to the audio lc .... raise a leg of the R819 of 0.18ohm ... and see if the whistle goes in the chopper ... if it is not prob , of the audio lc ... change the C806 of 100mfx160v and the C809 and 820 of 1000mfx25v ... as these are part of the source regulation ... check the C801 of 220mfx400v in the primary of the source and see if it is not used up ... if it has an AC ammeter, measure the source consumption on the power grid line when giving power ... greetings!
9.501
hace 5 años
disconnect focus q. put in the + b ... leave the source empty put the voltmeter on the positive of the C806 and without taking your eyes off the voltmeter plug the tv and see if voltage appears on the C806 ... if it appears see until q, voltage arrives and if it later falls to stand-by. If there is no voltage, disconnect the TV and measure the D802 and D814 in direct and inverse and see if there are some in short or leaking ... if the diodes are well measure q, voltage it has on pin1 and pin3 of lc 801 in the primary of the source ...
124
hace 5 años
The C806 dE 160V / 100UF filter completely dry with a liquid attached to the plate, the c821 was also replaced. When testing the source with a 60watts bulb I have no secondary voltage, I remove the bulb parallel to the c806, the secondary voltages appear, and the TV turns on. Thanks for such an assertive answer. To test this source with a focus on the secondary line + b the focus for the load of how much it would be.
9.501
hace 5 años
You already gave the solution to colleague Javier Chavez ... I am supposed to. the tv is already working ....
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