Samsung LCD TV 8 times blink red diode /wont turn on/

[dskall]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

IC1105 may be shorted. Ic101 output feeds input of ic1105

[budm]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

Check the resistance between GND and the output pin of that 9V regulator first to see what you get.

[coojoe_213]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

Check the resistance between GND and the output pin of that 9V regulator first to see what you get.

58.6 Ohm /78m09/
458 ohm /mc33269/
Is it normal resist.?

Question: If i have blow/bad CCFL lamp what is the simptomps?

[budm]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

58.6 Ohm /78m09/
458 ohm /mc33269/
Is it normal resist.?

Question: If i have blow/bad CCFL lamp what is the simptomps?

58 Ohms on the Output side does not look right.

If the set has one or more bad lamps you will then get the 3-seconds to black symptom, the good lamps will come on for seconds then the circuit goes into protection shutdown due to bad lamps.

[coojoe_213]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

58 Ohms on the Output side does not look right.
.

I put black probe on GND 78M09, red probe on Output 78M09. 78M09 is on the mainboard. 78M09 is brand new. How many ohm must have?

[budm]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

I expect to be in hundreds of Ohms, it may mean that what ever the loads are something is loading down the output of that 9V regulator.
it can be bad cap ceramic cap that has leakage resistance or the IC s that are being run by that 9V output may be bad. It is not the 9V regulator IC at this point.

[coojoe_213]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

I write the two IC EEPROM with original soft at same time, but 8 time blinks.
What about PWM/ADIM? I don't have any voltages at this poing..., is it mean there is a problem?

EDIT: 458 ohm /mc33269/ - 55oma is a real /gnd-output/

[budm]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

"55oma is a real /gnd-output/" What is the 55oma?
You need to get the correct Voltages first to go further.

[coojoe_213]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

55oma /in Bulgarian language=ohms/, sorry.
How to get correct voltage? I have pefect 12 volts on input 7809 (replace with new) and is the same..., may be the problem is on mc33269 ... or do you thing C103 or C101 (100nf) make a problem? C104/C151 /100mf/16v i test with esr meter, they are perfect/.

[budm]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

You will use Ohm meter to check those ceramic cap for leakage resistance.The common failure mode of ceramic is shorts or bad leakage resistance. It should show infinite resistance when tested with Ohm meter.

[coojoe_213]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

If i remove mc33269-5.0 is it problem, only for test?

[budm]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

Once you remove the suspected bad part then you should be able to check ad see if the 9V output will be back to normal or not. That 9V output may have many devices connected to it.

[coojoe_213]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

Ok, i remove mc33269-5.0, and when i measure output on 78m09, the situation is the same 1.3v :/.
With ohm meter you can see my pics between gnd and two ceramics caps /100nf/ which connect 78m09 output and mc33269 input is 45-50 ohm.

[budm]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

Did you try removing the cap yet?
So beside the output of that 9V regulator feeding the MC33269-5 5V regulator, that 9V should also be feeding other circuits as well. Where else does it go to in your schematic?

[dick_barton]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

The B9V supply also feeds IC8004-EU which is the DAC Stereo IC

[coojoe_213]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

TV work now. Problem: inverter , open F5, short IC.

[budm]

Re: Samsung LCD TV 8 times blink red diode /wont turn on/

TV work now. Problem: inverter , open F5, short IC.

What inverter? What IC? F5? Are all those parts on the main board?
We need more details.