My laptop's main board model is EAL50 and a local repairer confirms the fault is the voltage regulator with part number 4407-BESK4H but that part is not listed anywhere so I can't get a replacement or any details to help work out what would be a valid alternative.
No replacement main board is available either so i need to fix this one.
Where do I look to find what part I need?
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Please check the voltage at the pin end of the laptop using a multimeter in the voltage range. If absent then there is fault in the adapter and must be opened to confirm or replace.If present then connect and check the voltage at the pin end of the battery terminal in the laptop , if present the battery is a suspect.Check this link: http://www.fixya.com/support/r5164850-laptop_power_supply
There can be fault in the inverter drive, the back light circuit or the main power board.
You will need to open the mother board and check on all leads on the mother board- use a magnification observing lens.
Tighten all connectors and solder suspected joints. Check with an external display to confirm the display circuit and then pin point to the display unit in detail of the drive section.
This can be failure of the display driver, failure of the power supply to the display , failure inthe connecction flexible cord to the display or a fault in the mother board.
All these can be confirmed only with a detailed check on the main board.
The problem isn't your laptop because the fault is coming from your charger. Blinking of led light in your charger indicated that it goes in out-of-regulation. To confirmed the fault you need to use another charger with the same output voltage and current ratings. Once confirmed that the laptop will power on with other charger, you need to replaced your own. There some shop that repair this faulty charger, you must find one and ask for estimate how much will be charged to get fix to have an idea whether to buy a new one.
Hope I help you.
Have a nice day!
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Mainly check the power to the PC from the adapter, Check to see if there is voltage to the battery by removing and testing with a multimeter.
If there is no voltagecheckadapter, check the battery with an external charge to confirm if there is reverse polarity on the battery so as not to retain charge.
Now check also the bios battery, check for voltage, if not the memory could be faulty too.
Finally a fault in the mother board cannot be ruled out.
Unless the set is opend to probe inside the fault cannot be confirmed.
So the mother board seems to have short in the board and so the adapter when plugged in shorts. you must check the adapter for voltage, the battery for voltage, if not check if faulty.
Refer to my tips on laptop adaptor failure in my tips profile.
If the power section is checked the fault can be found or else the mother board is faulty.
hi, i have had the privilege of work on these particular series of HP Laptops. This may sound daft, but have you tried the brightness keys? If so you have a fault with the backlight which is caused by 1) a fault on the Mainboard 2) the inverter has blown (a small circuit board the regulates the voltage from main board to the lcd screen) 3) The backlight on the lcd screen has blown. You will need to determine where the fault lies before paying out large sums. You may want to get a diagnostic done by a Local laptop company. Hope this helps.
This unit had a RED CHARGE error. Replaced PQ38 solved the problem.
If you get an error on the charge circuit after replacing the PQ38 you should also replace PQ38 because it too may be blown. Make sure Pin 1 where the dots. Also check the MOSFET on the other side of the COIL too.
Always start with the simplest solution first so start by cleaning all the contacts, AC adapter laptop plug, laptop socket, laptop battery contacts and battery contacts.
How have you confirmed power output from the AC adapter? have you used a voltmeter to ensure you are getting power at the laptop end?
Have you used a voltmeter to test the battery?
Assuming you have tried all this don't forget that almost any component can interrupt power on some laptops, however you're 2 main culprits with this kind of problem are usually power controller (voltage regulator) and in some cases, on a laptop of this vintage, the charge controller built in to the battery.
Try it with a different battery if you have one.