HISENSE LCD LED TV MODEL HX40N2176F LED DRIVER SN51DP IC PINOUT AND VOLTAGES

[RossMoodley1967]

Hello

Need to know the voltages that will be present on SN51DP ic when tv is in standby and when powered on.

Just to elaborate on the problem with the tv 1.set came in with flash of HISENSE logo on screen then back into standby.2. Now tv when plugged in red standby light present to quickly changes to blue but no backlights.3.Then an hour ago i checked again , came on standby and stayed until i pressed the power button which changed to power on (blue)4.As far as the led driver circuit goes voltage at output in standby was 38v , power on led light up voltages rise 58v-68v then drops to 42v.I have replaced a bulging 33 microfarad cap 200 v with a 33 microfarad cap 250v but still the same.There are mosfets (source shorted in respect to ground) and diodes shorted in the driver circuit.Suspecting ic faulty , hence the reason for requesting assistance with voltages.thank you so much

thank you so much.

[nomoresonys]

Post good focused straight on picture of the board, describe which parts are shorted as in D108, etc, easy to test a mosfet for short in circuit, just check if any of the leads are sorted to the other two leads or you get very low ohms, the diode is probably the easiest to remove and check if it reads short, as always make sure ALL solder joints on bottom of board are good, not cracked/cold etc, can search for bad solder joint images if needed.

[nomoresonys]

Post good focused straight on picture of the board, describe which parts are shorted as in D108, etc, easy to test a mosfet for short in circuit, just check if any of the leads are sorted to the other two leads or you get very low ohms, the diode is probably the easiest to remove and check if it reads short, as always make sure ALL solder joints on bottom of board are good, not cracked/cold etc, can search for bad solder joint images if needed.

[nomoresonys]

Since you know you had at least one bad capacitor, try heating the electrolytic capacitors with a hairdryer for a couple minutes and try tv, don't wait til it cools, try it while it's still hot.