I have two Sharp PS boards pulled from non-working TVs. I got a replacement board for one of the TVs and it works fine. When replaced with either of these boards the TV does not work. I would like to fix them and recoup some of the cost of the replacement board.
All of the voltages up to the LED output seem fine. 170 volts on the main caps in standby, 5v standby, and when 2.8 volts are applied to panel on and ps on I get the 12v and 13 volts out to the main board. The voltage on the main caps rises to 407 volts on both the 168 and 162.
However, the output on the LED pins, all four, is a constant 62 volts. With 136 LEDS split between four banks it would seem to require at least 110volts. It is the same with the second board but the LED output is a constant 82 volts.
Thanks for any help.
All of the voltages up to the LED output seem fine. 170 volts on the main caps in standby, 5v standby, and when 2.8 volts are applied to panel on and ps on I get the 12v and 13 volts out to the main board. The voltage on the main caps rises to 407 volts on both the 168 and 162.
However, the output on the LED pins, all four, is a constant 62 volts. With 136 LEDS split between four banks it would seem to require at least 110volts. It is the same with the second board but the LED output is a constant 82 volts.
Thanks for any help.
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