i have the above monitor and after downloading about 20 schematics (various viewsonic) i still havnt found an exact match to the power board, 24 and 5 volt lines are present but the monitor just flashes the power led, there is a ticking noise which seems to be coming from the video card, if i disconnect the power cable from the video board then the monitor powers up with a white screen, i intend to recap the power board as soon as i can get to a supplier which is open after the xmas break, i replaced 2 caps in the power supply a 22uf 50v one and a 10uf 50v one because the originals looked burned and on the positive leg of the i am getting a very high dc voltage (150v) any help would be appreciated.
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Hanns G HG216D flashing power button
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Re: Hanns G HG216D flashing power button
Originally posted by Sparks88 View Postion the positive leg of the i am getting a very high dc voltage (150v) any help would be appreciated.
2) There is one voltage regulator on the main board. It is I104.
a) What is the part number?
b) What is the DC voltage on each pin?
3) Some monitors require an input. Hookup a working computer with your favourite wallpaper.
a) Does the power LED still blink?
b) If yes, what color?--- begin sig file ---
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Re: Hanns G HG216D flashing power button
The output voltage is correct for a 7585-3.3st.
So all your voltages on the power and main board look correct.
I108 may be your eeprom/flash. If it is corrupt, that might explain the power led flashing blue.
The only other idea I have right now is what is that 4 pin connector (upper right on the main board) going to?--- begin sig file ---
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Re: Hanns G HG216D flashing power button
the connector is for the built in speakers
is there any way to reset the eeprom (i have tried the up/down and power then connect to mains but that doesnt work or as a last resort reprogram it, i have a programmer so i would need the flash file but cannot find anywhere to download it.
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Re: Hanns G HG216D flashing power button
Originally posted by Sparks88 View Postthe 2 outer ones are stm6920 the 2 inner ones are stm4953, I801 is ld7575ps
I suggest you try checking them for shorts. With your meter set to resistance, start with:
S1-G1
G1-D1
S1-D1
Do the same for:
S2-G2
G2-D2
S2-D2
Perform these tests for all 4 chips and post your readings.Last edited by jetadm123; 01-02-2012, 06:59 PM.
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Re: Hanns G HG216D flashing power button
At this point, I don't see recapping the power/inverter board will do any good, since your getting voltage output for the inverter section and the signal/logic card.
The problem lies with the signal card. Since you think that there's a ticking sound comming from that card, it might possibly indicate a bad capacitor. Try listening for the sound using a cardboard tube from a roll of paper towels. As another test, use a hair dryer to heat up the caps on the signal card to see if that makes any difference.
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Re: Hanns G HG216D flashing power button
Originally posted by Sparks88 View Postif i disconnect the power cable from the video board then the monitor powers up with a white screen,Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!
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Re: Hanns G HG216D flashing power button
when i disconnect the power board from the logic board i get a white screen, i did not leave it too long as i was worried in case i might damage the inverter/lcd section.
Today i took a longer look and the ticking noise is actually coming from the mains input side of the power supply from the area of the optocoupler/main dc cap and if i disconnect the logic board the ticking changes to a very faint buzzing, disconnecting the lcd ribbon does not change anything from the original fault, i have looked over the logic board with a big illuminated magnifier but there isn't anything obvious, i have ordered a esr meter from portugal so when it arrives i will be able to test further as this is turning into a epic battle which i dont want to lose just on principle and i thank everybody for the help they are offering.
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Re: Hanns G HG216D flashing power button
Hello!!!! The input voltage to I104 is very low - 4.69 volts. I would have expected it to be more in the order of 5.1 volts.
Using one of the mounting screws as ground, what is the voltage on each pin of the connector to the signal (AKA logic) board?
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.
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Re: Hanns G HG216D flashing power button
Originally posted by PlainBill View PostHello!!!! The input voltage to I104 is very low - 4.69 volts. I would have expected it to be more in the order of 5.1 volts.
The datasheet at
suggests than Vin => 4V and Vout is 3.3 V (page 2) are typical.
Page 3 says minimum is 2.75V and maximum is 7V so I thought nothing of 4.69V being low.--- begin sig file ---
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We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
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Re: Hanns G HG216D flashing power button
hi Bill, the numbers on the power board and wire colours are inverted/opposite on the logic board so i am giving you the numbers off the logic board as follows
pin 1 no dc volts but 3.6v ac
pin 2 2.9v dc
pin 3 low voltage pulsing in time with front power led about .8v dc
pin 4 5v dc
pin 5 5v dc
pin 6 0v
pin 7 0v
pin 8 5v dc
pin 9 0v
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Re: Hanns G HG216D flashing power button
Originally posted by Sparks88 View Posthi Bill, the numbers on the power board and wire colours are inverted/opposite on the logic board so i am giving you the numbers off the logic board as follows
pin 1 no dc volts but 3.6v ac
pin 2 2.9v dc
pin 3 low voltage pulsing in time with front power led about .8v dc
pin 4 5v dc
pin 5 5v dc
pin 6 0v
pin 7 0v
pin 8 5v dc
pin 9 0v
I would also be curious about the drop from the connector to I104.
PlainBillFor a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.
Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.
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Re: Hanns G HG216D flashing power button
jumper l803 measures aound the 26v mark, one thing i am not sure about is the positive leg of c810 measures 122v, this is wrong as the startup ic I801 has a max on vcc of 30v, the 27v zener Z803 has been changed and this doesnt make and difference, the fault probably lies in this area but all the components running that part of the circuit test ok, i will take another look at the 5v feed voltage drop on the logic board.
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