Acabei de receber algumas dicas e nessa fonte, ainda em inglês
1. Symptom
- Sheet Wrinkles occur on the LCD bottom side as a result of heat.
2. Cause : Issue with IC801 on the power board.
- LED current is increased.
[Action]
If Sheet wrinkle occurs as shown in the right picture, ONLY after power supply is determined to be defective.
replace with new Power board and Panel
To determine old or new Power Supply:
1) Check the IC801 (at the bottom of the Power Board)
IC801 revision, (Old) IW7025 (New) IW7029
PSU P/N & Model list
PSU P/N : EAY63149401 2. Model : 49UB70,49UB82,49UB83,49UB84,49UB85,49UB86,49UB88
55UB70, 55UB82, 55UB83, 55UB84, 55UB85, 55UB95
Replace with new power board produced since Oct. 13, 2014.
1. Check the production date through the Barcode (PSU S/N) on the power board.
If PSU was produced before Oct. 12, 2014, then it must be replaced.
? PSU S/N format.
2. Check the LED + voltage between P211 and P210 by using digital multi meter.
Identificação componentes