Power Loop Fail Troubleshooting

POWER LOOP FAIL

PROBLEM: I have changed, multiple logic board, LCD cables and batteries but the device will still not boot. What is going on?

ANSWER TO QUESTION:

• 1. 1 of the 10 components below is damaged or not providing power.

  2. You were installing/testing only one of following components at a time: LCD, LCD CABLE, BATTERY, LOGIC BOARD, and NOT - ALL OF THEM AT THE SAME TIME

  3. Because there was an electrical power issue at 1 of 10 components listed below. When you installed the 1 component, a different component in another area was still damaged leaving the device unbootable.

  4. The other “Unknown damaged component” is still sending bad voltage *** Most likely over the cables, to your new component. Now you have a damaged newly installed component.

  5. You are now stuck in an infinite “Power Fail Loop”

SOLUTION:

Remove all electronic components, leaving only plastics. Get a new: Logic board, LCD, LCD CABLE, BATTERY

• 1. DO NOT CONNECT BATTERY, DO NOT CONNECT LCD CABLE TO BOARD.

  2. CONNECT LCD CABLE TO LCD

  3. Test power in numerical order below up to #4 - Do you have lights on board? No check again. Yes go to D.

  4. Remove AC adapter power and connect LCD cable. Make sure CPU has heatsink on it. Test the device. Device should boot.

  5. Check CPU Temperature. Wait 3 minutes. Is device stable? No. Start entire process in solution over again.

  6. Device is stable. Verify whether battery has physical damage. If so change battery. If no go to G.

  7. Disconnect ac power. Install ***Customers battery **** must have no physical damage. Does device boot?

NO LIGHTS/NO POWER = unplug battery immediately and replace with a new one

DEVICE BOOTS = Check CPU temperature and make sure device remains on and stable with no intermittent

shut off before sealing and sending to Q.C.