V59 board screen T370HW V5, the initial fault is a grimace, automatic shutdown, and then a green light turns red, power board 5v, 12v normal, 24v no, 24v is an independent switch transformer output, ic is uc3842, its power supply 15v is normal, and 24v is back to normal. The test machine is still screened and after a few seconds as shown below
The test machine turned gray screen for a while... Check the logic board insurance F1 open circuit, Q302 is also open circuit damage (U801 power supply). The logic board is independently added with 12V maintenance power supply, the current is up to 800 ma, and it is found that V20 and R205 are hot, R205 has changed color but the resistance is normal. Remove the V20 and continue to electrify, the current is still large, the hand touches U21 (AS15-G) heat, replace it, restore V20, Q302 replaces with a 0 ohm resistor (welded at R332 position, it is empty), test machine OK.
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