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Compaq FP7317 flat panel monitor schematic HELP

R

Robert Baer

Need correct schematic for the FP7313 s/n CNN45248SR board PTB-1355.
Only decent schematic available online is
www.go-gddq.com/upload/2009-11/09112710434722.pdf and it is WRONG.

CFL driver on this monitor is NOT a Royer..a 20-pin skinnydip drives FET
switches from a 22.5V supply.
Board designation is 6832135500-02 PTB-1355 11/01'04.
 
Need correct schematic for the FP7313 s/n CNN45248SR board PTB-1355.

Only decent schematic available online is

www.go-gddq.com/upload/2009-11/09112710434722.pdf and it is WRONG.



CFL driver on this monitor is NOT a Royer..a 20-pin skinnydip drives FET

switches from a 22.5V supply.

Board designation is 6832135500-02 PTB-1355 11/01'04.

Google the skinny dip part number for a spec sheet to get an idea of what the ckt could be. If the lamps don't light up (power lamp blinking) then a.) look for the on board fuse from the primary regulator to the cfl supply. b.) substitute a working cfl from another display. play games to determine which one is bad as a bad lamp will keep the whole display dark. c.) I sawsomeone in S.E.R. rigged up a neon bulb with a bunch of (1 - 10) meg resistors to simulate same. Can't have too much lamp current OR too much/too little lamp voltage or it won't light up. Take note of the polarity of PWR GOOD from the main regulator and voltage levels off the other regulator ckts on the display processor board as they may be checked with a comparitor locally and temper the state of the PWR GOOD. Do you see an image if you shinea flashlight to the screen? Yes probably cfl supply problem.
 
R

Robert Baer

Google the skinny dip part number for a spec sheet to get an idea
* Numbers on part (3 lines):
OZ960D
0432B1
V44502.4

So, please let this ignoramus know name of manufacturer ns the part
number.



of what the ckt could be. If the lamps don't light up (power lamp

blinking) then a.) look for the on board fuse from the

primary regulator to the cfl supply. b.) substitute a

working cfl from another display. play games to determine which

one is bad as a bad lamp will keep the whole display dark.
* The transformer that drives the CFL has only one winding for primary,
driven by FETs from existing 22.5V supply (so fuse is OK), but no signal
to gates of the FETS; the 20-pin skinnydip has no measurable voltage on
any of the pins - making parts in that area suspect.
Too much complexity in that area for reasonable quick "schematic"
scribble from layout.

c.) I saw someone in S.E.R. rigged up a neon bulb with a bunch

of (1 - 10) meg resistors to simulate same. Can't have too much

lamp current OR too much/too little lamp voltage or it won't
* with no drive to the CFL xfmr, this seems useless.

light up. Take note of the polarity of PWR GOOD from the main
* ??power good?? this is not a (shrunken) PC supply in the flat panel
monitor.

regulator and voltage levels off the other regulator ckts on

the display processor board as they may be checked with a

comparitor locally and temper the state of the PWR GOOD.

Do you see an image if you shine a flashlight to the

screen? Yes probably cfl supply problem.
* Image can no longer exist, as i ripped out the LED/polarizer matrix
"sheet" and its drivers; all i am looking for is a nice diffused light
source.
Have done this before with great success, but those used the standard
12V supply Royer CFL circuit (they also did not initially work, but
logic was easy to fix).
 
* Numbers on part (3 lines):

OZ960D

0432B1

V44502.4



So, please let this ignoramus know name of manufacturer ns the part

number.







of what the ckt could be. If the lamps don't light up (power lamp



blinking) then a.) look for the on board fuse from the



primary regulator to the cfl supply. b.) substitute a



working cfl from another display. play games to determine which



one is bad as a bad lamp will keep the whole display dark.

* The transformer that drives the CFL has only one winding for primary,

driven by FETs from existing 22.5V supply (so fuse is OK), but no signal

to gates of the FETS; the 20-pin skinnydip has no measurable voltage on

any of the pins - making parts in that area suspect.

Too much complexity in that area for reasonable quick "schematic"

scribble from layout.



c.) I saw someone in S.E.R. rigged up a neon bulb with a bunch



of (1 - 10) meg resistors to simulate same. Can't have too much



lamp current OR too much/too little lamp voltage or it won't

* with no drive to the CFL xfmr, this seems useless.



light up. Take note of the polarity of PWR GOOD from the main

* ??power good?? this is not a (shrunken) PC supply in the flat panel

monitor.



regulator and voltage levels off the other regulator ckts on



the display processor board as they may be checked with a



comparitor locally and temper the state of the PWR GOOD.



Do you see an image if you shine a flashlight to the



screen? Yes probably cfl supply problem.

* Image can no longer exist, as i ripped out the LED/polarizer matrix

"sheet" and its drivers; all i am looking for is a nice diffused light

source.

Have done this before with great success, but those used the standard

12V supply Royer CFL circuit (they also did not initially work, but

logic was easy to fix).

Bob,
I'm late to the party as usual.... I googled >> OZ960D <<< and lo and behold >>> OZ960D datasheet | Pinouts | Circuits | Schematic for Intelligent Ccfl ...
www.dz863.com/datasheet-8380551663-OZ960D_Intelligent-Ccfl-Inver...

The thing is made my O2 Micro Page 2 of the pdf shows example 8-22v application circuit. You might find it is the same as on the board. When I workedon video displays, I was amazed at all the cards based on the same reference design but with slightly different eprom contents to tweak their performsnce. Don't ignore the enable pin/
From your further description it seems you are trying to make an X-ray film viewer?

good luck
al
 
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