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LCD TVs - LED
Lcd Hisense does not turn on
74
hace 5 años
hace 5 años
I have a TV that does not turn on has a hisense_rsag7.820.1673_power_supply_sch card you can download the schematic here https://elektrotanya.com/hisense_rsag7.820.1673_power_supply_sch.pdf/download.html .
Turn on stand by and when you press the power button the pilot LED flashes but nothing else. no image no backligh.
the main transformer outputs are high outside the nominal value
12v output It has 16V
24V output has 30V
and 16V 21V output
It also has a 5V output that does not leave the main transformer but does measure its value well.
I leave a photo of the source card.
2.085
hace 5 años
Okay. This component may be involved in the feedback of that part of the source, therefore, to start, replace optocoupler N833 and N834 (tl431) and try again, then if it remains the same check the correct value of resistors R863, 864 , 865, 866, 867, 868, 869, R854, R841, R840. Comment
3.058
hace 5 años
hace 5 años
Hello, reviewing the scheme of this source, you have more than one point, where you have + 5v, I have indicated the points with an arrow, to review
check, before the + 12v and 18v +,: Luck 
hisense_rsag7.820.1673_power_supply_sch.pdf [110.59kb]
hisense_rsag7.820.1673_power_supply_sch.pdf [110.59kb]
2.085
hace 5 años
No, for now it does not have to do, and replacing the eeprom is not a solution since there is data for the operation that is there, if one changes it without recording it with said data it would not turn on, and from experience it is not a component that fails to Point to replace it.
3.058
hace 5 años
From my experience, when a high voltage arc occurs, the first thing that happens is that the data from the (EEPROM) is deleted and in most cases it is replaced by a virgin and the RON of the micro loads the data (Basic , starting in the EEPROM) then with daily use more data is stored, in the memory, virgin, on many occasions I have done it and fixed the fault, another option is to look for the dump of this memory, I would use it, And see what happens. and I repeat because of the lightning strike, the damage caused has no logic, to continue investigating the fault, so always, you have to go to the
3.058
hace 5 años
Fixed the breakdown, another option is to look for the dump of this memory, I would add it, and see what happens. and I repeat because of the lightning strike, the damage caused has no logic, to continue investigating the fault, so always, you have to go to the easiest.
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