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Samsung HT-x20 Protection Problem

post #1 of 11
Thread Starter 
Hello guys, i have this home theater unit which is as stated above having this problem of going protected mode after about 20 to 30 minutes. It works fine when cooling period, when it gets warmed up around 20 mins plus, it shuts down by itself saying goodbye. The fan is working fine and i have already re soldered all the cold joint components. The set works perfectly fine except for this problem. Can anyone assist me in regards to this issue? Assistance highly appreciated.

I have already checked all capacitors for damage, all looks fine to me. No bloated caps, no burned out resistors. However, the IC 5Q1265RF is overheating extremely. Could that be the cause for the unit to go on protection mode? One more thing, i have inspected the power board during operation, the voltages are haywire. I checked one of the legs, suppose to be 12v, my meter shows 46v. One of the legs should show 5v, it shows 10v. The voltages seems to be higher than what it suppose to be like its stated on the board itself. Any ideas guys?



BTW, i have searched for the schematic diagram all over the net, no luck
post #2 of 11
Thread Starter 
Guess i wont be getting help in here anyway after all. Ive solved the issue myself and repaired it. Closing thread
post #3 of 11
How did you repaired? could be useful for others with same problem
post #4 of 11
Thread Starter 
Quote:
Originally Posted by tlalotoani View Post

How did you repaired? could be useful for others with same problem

Hi there, of course i can be helpful to assist. I replaced the 5Q1265RF 5 leg IC, DM0365R 4 leg IC. Its the protection and regulating IC. Thats what was faulty. Turning off by itself after half an hour. After replacing it, i tested for 2 days nonstop, still running fine.
post #5 of 11
Hey, i have the same problem with my samsung htx20. I need a manual. How i get from 5 leg's to 4 leg's? Sry, i'm not so good in english. Have you pictures? ^^
post #6 of 11
i have the same problem with my samsung htx20. I need a manual. How i get from 5 leg's to 4 leg's? Sry, i'm not so good in english. Have you pictures? ^^


Quote:
Originally Posted by DjKrish View Post

Hi there, of course i can be helpful to assist. I replaced the 5Q1265RF 5 leg IC, DM0365R 4 leg IC. Its the protection and regulating IC. Thats what was faulty. Turning off by itself after half an hour. After replacing it, i tested for 2 days nonstop, still running fine.
post #7 of 11
I see where the 5Q1265RF 5 leg IC, but cannot fine where the DM0365R 4 leg IC goes, or find one to buy. The only thing I find on ebay is an 8 pin (four on each side) power switch.
post #8 of 11
I have encountered a problem like this. Malfunctioning component inside the unit. It will go into protection mode and I immediately shut down to protect the system from any further damage. Unfortunately, I would have to bring to a dealer or repair shop to diagnose the exact malfunction.
post #9 of 11
La verdad, no entiendo bien lo que has hecho, dices que has sustituido el IC 5Q1265RF en el pin 5, (ya que el pin 5 es el sincronismo), y el IC DM0365R en el pin 4 dice: Ajusta la corriente limite de sensibilidad el FET con una realimentación de 0.9mA, de corriente en paralelo.... pero mi pregunta es a donde los has conectado o los desconectaste o que ha pasado con la regulación de estos Circuitos ?
no tengo claro tu arreglo.

Seria que me puedes explicar un poco mejor. De antemano, Gracias
post #10 of 11
Hi where to get this IC ? How much it cost ?
post #11 of 11

Hi, 

 

I can send you detailed repair manual. My e-mail is arset@abv.bg

 

If you know the exact model of DVD player or at least the laser pickup optic block it will be useful for me...

 

Aram

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